Home Coupling of two-phase flow in fractured-vuggy reservoir with filling medium
Article Open Access

Coupling of two-phase flow in fractured-vuggy reservoir with filling medium

  • Haojun Xie , Aifen Li , Zhaoqin Huang EMAIL logo , Bo Gao and Ruigang Peng
Published/Copyright: March 2, 2017

Abstract

Caves in fractured-vuggy reservoir usually contain lots of filling medium, so the two-phase flow in formations is the coupling of free flow and porous flow, and that usually leads to low oil recovery. Considering geological interpretation results, the physical filled cave models with different filling mediums are designed. Through physical experiment, the displacement mechanism between un-filled areas and the filling medium was studied. Based on the experiment model, we built a mathematical model of laminar two-phase coupling flow considering wettability of the porous media. The free fluid region was modeled using the Navier-Stokes and Cahn-Hilliard equations, and the two-phase flow in porous media used Darcy's theory. Extended BJS conditions were also applied at the coupling interface. The numerical simulation matched the experiment very well, so this numerical model can be used for two-phase flow in fracture-vuggy reservoir. In the simulations, fluid flow between inlet and outlet is free flow, so the pressure difference was relatively low compared with capillary pressure. In the process of water injection, the capillary resistance on the surface of oil-wet filling medium may hinder the oil-water gravity differentiation, leading to no fluid exchange on coupling interface and remaining oil in the filling medium. But for the water-wet filling medium, capillary force on the surface will coordinate with gravity. So it will lead to water imbibition and fluid exchange on the interface, high oil recovery will finally be reached at last.

1 Introduction

For fractured-vuggy carbonate reservoirs in Tahe Oilfield of China, solution caves and fractures are main spaces for fluid storage and flow. But the huge caves are normally filled with collapsing rocks, carried sands or chemical sedimentation, which is shown in Fig 1. Different kinds of filling mediums have different wettability and permeability [1, 2]. The oil-water flow in reservoir is the coupling flow of free flow in un-filled area and porous flow in filling medium. Most wells can only open the top of the cave because of heavy loss of drilling fluid, so we usually use water injection to displace the oil by gravity in the caves. In recent years, many physical and numerical simulations have been conducted for the flow mechanism and remaining oil distribution in fractured-vuggy media.

Figure 1 Field outcrop of filled cave and physical model
Figure 1

Field outcrop of filled cave and physical model

For the experiment, P Egermann (2007) used the tight matrix with large vugs to evaluate the matrix-imbibition phenomenon complex water-gas-flow interactions between vugs and micro pores [3]. Kang (2006) and Wang (2011) used glass etched microscopic model to stimulate the water injection process in fracture and vugs in low pressure [4, 5]. Li (2010) built a large size water tank with PVC caves to simulate the fracture-vuggy reservoirs, and considering the filling medium using glass balls without cemented in the cave [6]. After that, Li and Zhang (2012) conducted the elastic recovery experiment in insular cavity using high-pressure container [7]. Although these experiments considering the filling medium, but they use only glass balls or carbonate rocks. Since the parameters of the filling medium that were used were unknown, numerical simulations were not conducted for these experiment results.

Coupled free fluid flow and porous flow systems arise in a wide range of environmental and industrial applications, such as evaporation from soil influenced by atmosphere flow [8], multi-phase fluid flow through fractured-vuggy carbonate reservoir [9, 10] and etc. The key challenge in such flow and transport processes is the coexistence of free flow and porous flow [11-13]. In recent years, two-domain approach is usually used for coupling of free fluid flow and the porous flow. Jackson developed a transition region model that is capable of coupling two-phase and multi-component systems, but the solution is non-trivial and still an open issue [14]. Chen developed a numerical model for the coupling two-phase free flow and porous flow [15]. Their model consists of coupled Cahn-Hilliard and Navier-Stokes (CHNS) equations in the free fluid region and the classical two-phase Darcy equations in the porous medium. Han recently proposed a coupled Cahn-Hilliard and Stokes-Darcy (CHSD) two-phase flow model, which consists the Cahn-Hilliard-Darcy equations system in porous medium and the Cahn-Hilliard-Stokes equations system in the free flow region [16]. More recently, Huang built developed a CHNS model with extended BJS conditions. And the experiment proved it more suitable to capture the macroscopic flow characteristics [17, 18].

In this paper, we built physical and numerical models for filled caves considering the wettability of the filling medium. Experiments verified the accuracy of the numerical models. Based on the results of the experiments and numerical simulations, the influences of wettability on the coupling flow and remaining oil distribution were analyzed. The results indicated that the capillary force determines the fluid exchange on interface and remaining oil in the filling medium.

2 Physical Model and Methods

2.1 Physical Model

Visual physical models were built to study the oil-water exchanging mechanism simplified from the field outcrop (Fig. 1). The model used PMMA (polymethyl methacrylate) as transparent boundary to simulate the cave. The glass beads were cemented by epoxy in bottom of the model. to simulate filling medium area in the cave, and the empty part at the top is the un-filled area, which is shown in Fig. 2. Size of the model is 10 cm × 10 cm × 1 cm; filling degree in cave is about 50% percent; the particle size of filling medium is 0.6 mm; porosity of the filling medium is about 35%; permeability is about 1 × 10-10 m2. Inlet and outlet were drilled at two sides on the top of model. The experiment process is shown in Figure 1c.

Figure 2 Fluid saturation at different times in experiment of oil-wet model
Figure 2

Fluid saturation at different times in experiment of oil-wet model

2.2 Material

In this experiment, saline water (salinity 5000 mg/L, relative density 1.0) and kerosene (relative density 0.8) was used as formation water and oil. And the kerosene was colored red by Sudan III. The interfacial tensions between the saline water and the oil is about σwo = 25 mN/m. The wettability of the pore surface in filling medium was controlled by the epoxy [19].

2.3 Experiment procedures

(1) Fully saturate the model with oil, and measure the oil volume in the model by weighing method. Then connect the model to the inlet and outlet pipes, and hold the model vertical as shown in Figure 1.

(2) Inject water into the model with a low flowrate of 0.5 ml/min and produce liquid at atmospheric pressure. Keep water injection for 48 hours and observe the water displacing oil under gravity.

(3) Record fluid flow dynamic and liquid production, then clean and dry the model.

3 Numerical Model

3.1 Equations in free flow region

Two-phase flow in free flow region was described by phase filed method, including Cahn-Hilliard and N-S equations, given by

(1) Cahn-Hilliard equation

ϕt+uFϕ=γβϵ2ΨΨ=(ϵ2ϕ)+ϕ(ϕ21)(1)

φ is a dimensionless phase field variable, which is equal to 1 in oil and -1 in water; uF is the free flow velocity, [m/s] ; ε is the thickness of interface, [m]; γ is the mobility; β is the magnitude of the mixing energy, [N]; ψ is an auxiliary phase field variable.

(2) N-S equations

uF=0(2)
ρuFt+(uF)uF=(pFI+τ)+ρg+Gφ(3)

where ρ is the fluid density, [kg/m3]; p is the fluid pressure, [Pa]; I is d×d identity tensor, d is the dimensionality; τ = μ[∇uF + (∇uF )T] denotes the viscous part of the stress tensor, [Pa]; μ is the fluid viscosity, [Pa·s]; g is the gravity acceleration vector, [m/s2]; and G is the chemical potential, [N/m2].

3.2 Equations in porous flow region

In porous flow region, the mass balance equation is:

φρlSlt+ρluPl=ρlql,l=w,o(4)

where Φ is the porosity of the porous domain; ρl is the l -phase fluid density; Sl is the l -phase fluid saturation; uPl is the l -phase fluid seepage velocity; and ql is the source/sink term of l -phase fluid, [1/s]. The uPl s defined by the Darcy's law:

uPl=Kpkdμl(pPlρlg),l=w,o

where KP is the absolute permeability, [m2]; krl is the relative permeability of l -phase fluid, and 0≤ krl(Sw) ≤1; pl is the l -phase fluid pressure; μl is the 1-phase fluid viscosity; g is the gravity constant; The constraint for the saturation and pressures relationship are:

lSl=Sw+So=1;pPcSw=pPopPw(5)

where ppc is capillary pressure, [Pa] ; pp0 and pp0 is the pressure of water and oil, [Pa].

3.3 Interface conditions for coupling

Continuity of normal flux is given by:

uFnPF=uPw+uPonPF=uPnPF(6)

Continuity of normal stress is:

nPFpFI+τnPF=1+φ2pPo+1φ2pPw=pPw+1+φ2pPc(7)

The tangential jump condition used the extended two-phase BJS condition [16] which was developed by:

tPF(p+FI+τ)nPF=ημKptPFuFb(8)

3.4 Initial conditions

Initial conditions for two domains are:

pFx,t=0=pF0xuFx,t=0=uF0xφx,t=0=φ0x,inΩF(9)
pPlx,t=0=pPl0xSlx,t=0=Sl0x,inΩP(10)

The CHNS equations are implemented by using the laminar two-phase flow (phase field) model and the two-phase Darcy equations are modeled by using coefficient form PDE model in COMSOL Multiphysics V5.0. The coupled flow system is solved using the direct solver MUMPS (multi-frontal massively parallel sparse direct solver).

4 Results and Discussions

4.1 Comparison between experiments and numerical simulations

(1) Results of oil-wet model

Fluid saturations in experiments and numerical simulations at three different times were given in Figure 3 and Figure 4.

Figure 3 Fluid saturation at different times in numrical simulation of oil-wet model
Figure 3

Fluid saturation at different times in numrical simulation of oil-wet model

Figure 4 Fluid saturation at different times in experiment of water-wet model
Figure 4

Fluid saturation at different times in experiment of water-wet model

In the experiment results, oil-phase is red and water-phase is white. While the color code represents relative density in numerical simulation results. Considering the micro roughness of porous media in experiment, the water phase movement at beginning in Figure 2a and Figure 3a was a little different, and it was reasonable. The oil recovery of physical experiment and numerical simulation is 72.8% and 75.4%, so the experiment results have a good agreement with the numerical simulations comparing Figure 3 and 4. At the beginning, the water will first drop on the surface of the porous media, and then the water phase will cover the surface. With injection continued, the oil-water interface will slowly raise to the top of the model. Capillary force in porous media will block the gravity differentiation, so the water will not flow across the interface and get into the porous media in the whole process.

(2) Results of water-wet model

For the water-wet model, the oil recovery of physical experiment and numerical simulation is 94.3% and 95.8%, so the experiment results still have a good agreement with the numerical simulations comparing Figure 3 and 4. The injected water will first drop on the surface of the porous media, and then the water phase will cover the surface. The capillary force has the same direction with gravity for the water-wet model. Under the cooperating effect of capillary force and gravity, the water will flow across the coupling interface with water injection continued. And the oil in the porous media will flow upward as a droplet, which can be seen on the interface in both Figure 4b and Figure 5b. So the oil in porous media will be displaced at last.

Figure 5 Fluid saturation at different times in numrical simulation of water-wet model
Figure 5

Fluid saturation at different times in numrical simulation of water-wet model

4.2 Fluid exchange at interface

Fluid velocity distributions at 30 min were calculated in numerical simulations to analyze the fluid exchange at coupling interface, which is shown in Figure 6.

Figure 6 Fluid velocity distribute at 30 min
Figure 6

Fluid velocity distribute at 30 min

Compared with free flow, the viscous resistance of Darcy flow is very high, so the velocity in porous media was really low in both two models and even can't be reflected in Figure 6. But the velocity field above the interface is different for two models. In oil-wet model, there is nearly no fluid exchange at the interface, so the velocity above the interface is very low and the direction is mostly horizontal. The oil-water interface increases slowly to the top of the model, and the oil flow to the outlet due to the driven pressure and gravity. The upper part of water phase flow to the outlet due to driven pressure, but it will flow downward at the right boundary because of gravitational differentiation, which lead to vorticity in Figure 6a.

While for the water-wet model, there is obvious fluid exchange at the interface. So the velocity above the interface in higher than oil-wet model, and its direction are somehow vertical. Water flows across the interface made the vorticity more complex than oil-wet model. Mean-while, the oil drop generated on the interface flows upward to the top of the model, and it also lead to vorticity in oil phase. The injected water and oil flows across the interface are discrete drops, the velocity field and vorticity are not very stable and ideal.

5 Conclusion

(1) The validation of the coupling model is verified by comparing numerical simulations with experimental results. So this method is suggested in the future works.

(2) Wettability of filling medium determines the remaining oil and oil recovery in filling medium. For the coupling flow, capillary pressure in porous media are relatively high compared with the driving pressure difference of free flow. Injected water can't flow into the oil-wet porous media and there is nearly no fluid exchange at the interface. But capillary force cooperated with gravity will lead to water imbibition in water-wet filling medium and obvious fluid exchange on interface. Thus, high oil recovery will be reached.

(3) Capillary force in the main reason for low oil recovery in fractured-vuggy reservoirs with oil-wet filling medium. So surfactant injection is an ideal method to decrease the capillary force and increase oil recovery, which needs a further experimental and numerical study on it.

Acknowledgement

National Science and Technology Major Project of China (2016ZX05014-003-002 and 2016ZX05009-001-007) supported this work.

References

[1] Hu G., Technological Policy Research of Cyclic Water flooding in Fracture-Cavity Carbonate Reservoir in Tahe Oilfield. Xinjiang petroleum geology, 2014, 35, 59-62.Search in Google Scholar

[2] Xu T., Lun Z., Zhang X., et al., Gravity drainage in oil-wet carbonate matrix rock system. Petroleum Exploration and Development, 2010, 37, 358-362.Search in Google Scholar

[3] Egermann P., Laroche C., Manceau E., et al., Experimental and numerical study of water-gas imbibition phenomena in vuggy carbonates. SPE Reservoir Evaluation & Engineering, 2007, 10, 86-96.10.2118/89421-MSSearch in Google Scholar

[4] Zhi-hong K., Principium experiment of oil seepage driven by water in fracture and vug reservoir of carbonater rocks. West China Petroleum Geosciences, 2006, 2, 87-90.Search in Google Scholar

[5] Wang Li., Dou Z., Lin T., et al., Study on the visual modeling of wter flooding in carbonate fracture-cavity reservoir. Journal of Southwest Petroleum University(S&T Edition), 2011, 33, 2, 121-124.Search in Google Scholar

[6] Li S., Li Y., An experimental research on water injection to replace the oil isolated caves in fracture-cavity carbonate rock oil-field. Journal of Southwest Petroleum University(S&T Edition), 2010, 32, 117-120.Search in Google Scholar

[7] Li A., Zhang D., Gao C., Law of water injector production in fractured-vuggy unit with enclosed boundry and constant volume, PGRE, 2012, 19, 94-97.Search in Google Scholar

[8] Mosthaf K., Baber K., Flemisch B., et al., A coupling concept for two-phase compositional porous-medium and single-phase compositional free flow, Water Resour. Res., 2011 47, W10522.10.1029/2011WR010685Search in Google Scholar

[9] Jambhekar V.A., Helmig R., Schröder N., et al., Free-Flow-Porous-Media Coupling for Evaporation-Driven Transport and Precipitation of Salt in Soil, Transp. Porous Media, 2015, 110, 251-280.10.1007/s11242-015-0516-7Search in Google Scholar

[10] Huang Z., Jun. Y, Wang Y. et al., Numerical study on two-phase flow through fractured porous media, Sci. China Technol. Sci., 2011, 54, 2412-2420.10.1007/s11431-011-4480-3Search in Google Scholar

[11] Beavers, G. S., and Joseph D. D., Boundary conditions at a naturally permeable wall, J. Fluid Mech., 1967, 30, 197-207.10.1017/S0022112067001375Search in Google Scholar

[12] Brinkman H. C., A calculation of the viscous force exerted by a flowing fluid on a dense swarm of particles, Appl. Sci. Res., 1947, 1, 27-34.10.1007/BF02120313Search in Google Scholar

[13] Saffman P. G., On the boundary condition at the surface of a porous medium, Stud. Appl. Math., 1971, 50, 93-101.10.1002/sapm197150293Search in Google Scholar

[14] Jackson A.S, Rybak I., Helmig R., et al., Thermodynamically constrained averaging theory approach for modeling flow and transport phenomena in porous medium systems: 9. Transition region models, Adv. Water Resour., 2012, 42, 71-90.10.1016/j.advwatres.2012.01.006Search in Google Scholar

[15] Chen J., Sun S., and Wang X.P., A numerical method for a model of two-phase flow in a coupled free flow and porous media system, J. Comput. Phys., 2014, 268, 1-16.10.1016/j.jcp.2014.02.043Search in Google Scholar

[16] Han D., Wang X., and Wu H., Existence and uniqueness of global weak solutions to a Cahn-Hilliard-Stokes-Darcy system for two phase incompressible flows in karstic geometry, J. Differ. Equ., 2014, 257, 3887-3933.10.1016/j.jde.2014.07.013Search in Google Scholar

[17] Huang Z., Gao B., and Yao J., On the interface boundary conditions for the Stokes-Darcy coupling problem. Scientia Sinica (Physica, Mechanica & Astronomica), 2014, 2, 012.Search in Google Scholar

[18] Huang Z. Q., Gao B., Zhang X. Y., et al., On the Coupling of Two-phase Free Flow and Porous Flow. In ECMORXIV-15th European Conference on the Mathematics of Oil Recovery (EAGA, Amsterdam, Netherlands, 2016)10.3997/2214-4609.201601774Search in Google Scholar

[19] Haojun X., Aifen L., Jianfei Q., et al., Manufacture of water wet artificial core by chemical modification method. In International Symposium of the Society of Core Analysts (SCA, Colorado, USA, 2016) 094Search in Google Scholar

Received: 2016-10-18
Accepted: 2016-12-13
Published Online: 2017-3-2

© 2017 Haojun Xie et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Articles in the same Issue

  1. Regular Articles
  2. Analysis of a New Fractional Model for Damped Bergers’ Equation
  3. Regular Articles
  4. Optimal homotopy perturbation method for nonlinear differential equations governing MHD Jeffery-Hamel flow with heat transfer problem
  5. Regular Articles
  6. Semi- analytic numerical method for solution of time-space fractional heat and wave type equations with variable coefficients
  7. Regular Articles
  8. Investigation of a curve using Frenet frame in the lightlike cone
  9. Regular Articles
  10. Construction of complex networks from time series based on the cross correlation interval
  11. Regular Articles
  12. Nonlinear Schrödinger approach to European option pricing
  13. Regular Articles
  14. A modified cubic B-spline differential quadrature method for three-dimensional non-linear diffusion equations
  15. Regular Articles
  16. A new miniaturized negative-index meta-atom for tri-band applications
  17. Regular Articles
  18. Seismic stability of the survey areas of potential sites for the deep geological repository of the spent nuclear fuel
  19. Regular Articles
  20. Distributed containment control of heterogeneous fractional-order multi-agent systems with communication delays
  21. Regular Articles
  22. Sensitivity analysis and economic optimization studies of inverted five-spot gas cycling in gas condensate reservoir
  23. Regular Articles
  24. Quantum mechanics with geometric constraints of Friedmann type
  25. Regular Articles
  26. Modeling and Simulation for an 8 kW Three-Phase Grid-Connected Photo-Voltaic Power System
  27. Regular Articles
  28. Application of the optimal homotopy asymptotic method to nonlinear Bingham fluid dampers
  29. Regular Articles
  30. Analysis of Drude model using fractional derivatives without singular kernels
  31. Regular Articles
  32. An unsteady MHD Maxwell nanofluid flow with convective boundary conditions using spectral local linearization method
  33. Regular Articles
  34. New analytical solutions for conformable fractional PDEs arising in mathematical physics by exp-function method
  35. Regular Articles
  36. Quantum mechanical calculation of electron spin
  37. Regular Articles
  38. CO2 capture by polymeric membranes composed of hyper-branched polymers with dense poly(oxyethylene) comb and poly(amidoamine)
  39. Regular Articles
  40. Chain on a cone
  41. Regular Articles
  42. Multi-task feature learning by using trace norm regularization
  43. Regular Articles
  44. Superluminal tunneling of a relativistic half-integer spin particle through a potential barrier
  45. Regular Articles
  46. Neutrosophic triplet normed space
  47. Regular Articles
  48. Lie algebraic discussion for affinity based information diffusion in social networks
  49. Regular Articles
  50. Radiation dose and cancer risk estimates in helical CT for pulmonary tuberculosis infections
  51. Regular Articles
  52. A comparison study of steady-state vibrations with single fractional-order and distributed-order derivatives
  53. Regular Articles
  54. Some new remarks on MHD Jeffery-Hamel fluid flow problem
  55. Regular Articles
  56. Numerical investigation of magnetohydrodynamic slip flow of power-law nanofluid with temperature dependent viscosity and thermal conductivity over a permeable surface
  57. Regular Articles
  58. Charge conservation in a gravitational field in the scalar ether theory
  59. Regular Articles
  60. Measurement problem and local hidden variables with entangled photons
  61. Regular Articles
  62. Compression of hyper-spectral images using an accelerated nonnegative tensor decomposition
  63. Regular Articles
  64. Fabrication and application of coaxial polyvinyl alcohol/chitosan nanofiber membranes
  65. Regular Articles
  66. Calculating degree-based topological indices of dominating David derived networks
  67. Regular Articles
  68. The structure and conductivity of polyelectrolyte based on MEH-PPV and potassium iodide (KI) for dye-sensitized solar cells
  69. Regular Articles
  70. Chiral symmetry restoration and the critical end point in QCD
  71. Regular Articles
  72. Numerical solution for fractional Bratu’s initial value problem
  73. Regular Articles
  74. Structure and optical properties of TiO2 thin films deposited by ALD method
  75. Regular Articles
  76. Quadruple multi-wavelength conversion for access network scalability based on cross-phase modulation in an SOA-MZI
  77. Regular Articles
  78. Application of ANNs approach for wave-like and heat-like equations
  79. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  80. Study on node importance evaluation of the high-speed passenger traffic complex network based on the Structural Hole Theory
  81. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  82. A mathematical/physics model to measure the role of information and communication technology in some economies: the Chinese case
  83. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  84. Numerical modeling of the thermoelectric cooler with a complementary equation for heat circulation in air gaps
  85. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  86. On the libration collinear points in the restricted three – body problem
  87. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  88. Research on Critical Nodes Algorithm in Social Complex Networks
  89. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  90. A simulation based research on chance constrained programming in robust facility location problem
  91. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  92. A mathematical/physics carbon emission reduction strategy for building supply chain network based on carbon tax policy
  93. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  94. Mathematical analysis of the impact mechanism of information platform on agro-product supply chain and agro-product competitiveness
  95. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  96. A real negative selection algorithm with evolutionary preference for anomaly detection
  97. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  98. A privacy-preserving parallel and homomorphic encryption scheme
  99. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  100. Random walk-based similarity measure method for patterns in complex object
  101. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  102. A Mathematical Study of Accessibility and Cohesion Degree in a High-Speed Rail Station Connected to an Urban Bus Transport Network
  103. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  104. Design and Simulation of the Integrated Navigation System based on Extended Kalman Filter
  105. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  106. Oil exploration oriented multi-sensor image fusion algorithm
  107. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  108. Analysis of Product Distribution Strategy in Digital Publishing Industry Based on Game-Theory
  109. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  110. Expanded Study on the accumulation effect of tourism under the constraint of structure
  111. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  112. Unstructured P2P Network Load Balance Strategy Based on Multilevel Partitioning of Hypergraph
  113. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  114. Research on the method of information system risk state estimation based on clustering particle filter
  115. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  116. Demand forecasting and information platform in tourism
  117. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  118. Physical-chemical properties studying of molecular structures via topological index calculating
  119. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  120. Local kernel nonparametric discriminant analysis for adaptive extraction of complex structures
  121. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  122. City traffic flow breakdown prediction based on fuzzy rough set
  123. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  124. Conservation laws for a strongly damped wave equation
  125. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  126. Blending type approximation by Stancu-Kantorovich operators based on Pólya-Eggenberger distribution
  127. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  128. Computing the Ediz eccentric connectivity index of discrete dynamic structures
  129. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  130. A discrete epidemic model for bovine Babesiosis disease and tick populations
  131. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  132. Study on maintaining formations during satellite formation flying based on SDRE and LQR
  133. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  134. Relationship between solitary pulmonary nodule lung cancer and CT image features based on gradual clustering
  135. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  136. A novel fast target tracking method for UAV aerial image
  137. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  138. Fuzzy comprehensive evaluation model of interuniversity collaborative learning based on network
  139. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  140. Conservation laws, classical symmetries and exact solutions of the generalized KdV-Burgers-Kuramoto equation
  141. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  142. After notes on self-similarity exponent for fractal structures
  143. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  144. Excitation probability and effective temperature in the stationary regime of conductivity for Coulomb Glasses
  145. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  146. Comparisons of feature extraction algorithm based on unmanned aerial vehicle image
  147. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  148. Research on identification method of heavy vehicle rollover based on hidden Markov model
  149. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  150. Classifying BCI signals from novice users with extreme learning machine
  151. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  152. Topics on data transmission problem in software definition network
  153. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  154. Statistical inferences with jointly type-II censored samples from two Pareto distributions
  155. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  156. Estimation for coefficient of variation of an extension of the exponential distribution under type-II censoring scheme
  157. Special issue on Nonlinear Dynamics in General and Dynamical Systems in particular
  158. Analysis on trust influencing factors and trust model from multiple perspectives of online Auction
  159. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  160. Coupling of two-phase flow in fractured-vuggy reservoir with filling medium
  161. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  162. Production decline type curves analysis of a finite conductivity fractured well in coalbed methane reservoirs
  163. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  164. Flow Characteristic and Heat Transfer for Non-Newtonian Nanofluid in Rectangular Microchannels with Teardrop Dimples/Protrusions
  165. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  166. The size prediction of potential inclusions embedded in the sub-surface of fused silica by damage morphology
  167. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  168. Research on carbonate reservoir interwell connectivity based on a modified diffusivity filter model
  169. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  170. The method of the spatial locating of macroscopic throats based-on the inversion of dynamic interwell connectivity
  171. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  172. Unsteady mixed convection flow through a permeable stretching flat surface with partial slip effects through MHD nanofluid using spectral relaxation method
  173. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  174. A volumetric ablation model of EPDM considering complex physicochemical process in porous structure of char layer
  175. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  176. Numerical simulation on ferrofluid flow in fractured porous media based on discrete-fracture model
  177. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  178. Macroscopic lattice Boltzmann model for heat and moisture transfer process with phase transformation in unsaturated porous media during freezing process
  179. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  180. Modelling of intermittent microwave convective drying: parameter sensitivity
  181. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  182. Simulating gas-water relative permeabilities for nanoscale porous media with interfacial effects
  183. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  184. Simulation of counter-current imbibition in water-wet fractured reservoirs based on discrete-fracture model
  185. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  186. Investigation effect of wettability and heterogeneity in water flooding and on microscopic residual oil distribution in tight sandstone cores with NMR technique
  187. Special Issue on Advances on Modelling of Flowing and Transport in Porous Media
  188. Analytical modeling of coupled flow and geomechanics for vertical fractured well in tight gas reservoirs
  189. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  190. Special Issue: Ever New "Loopholes" in Bell’s Argument and Experimental Tests
  191. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  192. The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
  193. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  194. Erratum to: The ultimate loophole in Bell’s theorem: The inequality is identically satisfied by data sets composed of ±1′s assuming merely that they exist
  195. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  196. Rhetoric, logic, and experiment in the quantum nonlocality debate
  197. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  198. What If Quantum Theory Violates All Mathematics?
  199. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  200. Relativity, anomalies and objectivity loophole in recent tests of local realism
  201. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  202. The photon identification loophole in EPRB experiments: computer models with single-wing selection
  203. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  204. Bohr against Bell: complementarity versus nonlocality
  205. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  206. Is Einsteinian no-signalling violated in Bell tests?
  207. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  208. Bell’s “Theorem”: loopholes vs. conceptual flaws
  209. Special Issue on Ever-New "Loopholes" in Bell’s Argument and Experimental Tests
  210. Nonrecurrence and Bell-like inequalities
  211. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  212. Three-dimensional computer models of electrospinning systems
  213. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  214. Electric field computation and measurements in the electroporation of inhomogeneous samples
  215. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  216. Modelling of magnetostriction of transformer magnetic core for vibration analysis
  217. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  218. Comparison of the fractional power motor with cores made of various magnetic materials
  219. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  220. Dynamics of the line-start reluctance motor with rotor made of SMC material
  221. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  222. Inhomogeneous dielectrics: conformal mapping and finite-element models
  223. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  224. Topology optimization of induction heating model using sequential linear programming based on move limit with adaptive relaxation
  225. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  226. Detection of inter-turn short-circuit at start-up of induction machine based on torque analysis
  227. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  228. Current superimposition variable flux reluctance motor with 8 salient poles
  229. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  230. Modelling axial vibration in windings of power transformers
  231. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  232. Field analysis & eddy current losses calculation in five-phase tubular actuator
  233. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  234. Hybrid excited claw pole generator with skewed and non-skewed permanent magnets
  235. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  236. Electromagnetic phenomena analysis in brushless DC motor with speed control using PWM method
  237. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  238. Field-circuit analysis and measurements of a single-phase self-excited induction generator
  239. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  240. A comparative analysis between classical and modified approach of description of the electrical machine windings by means of T0 method
  241. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  242. Field-based optimal-design of an electric motor: a new sensitivity formulation
  243. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  244. Application of the parametric proper generalized decomposition to the frequency-dependent calculation of the impedance of an AC line with rectangular conductors
  245. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  246. Virtual reality as a new trend in mechanical and electrical engineering education
  247. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  248. Holonomicity analysis of electromechanical systems
  249. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  250. An accurate reactive power control study in virtual flux droop control
  251. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  252. Localized probability of improvement for kriging based multi-objective optimization
  253. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  254. Research of influence of open-winding faults on properties of brushless permanent magnets motor
  255. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  256. Optimal design of the rotor geometry of line-start permanent magnet synchronous motor using the bat algorithm
  257. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  258. Model of depositing layer on cylindrical surface produced by induction-assisted laser cladding process
  259. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  260. Detection of inter-turn faults in transformer winding using the capacitor discharge method
  261. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  262. A novel hybrid genetic algorithm for optimal design of IPM machines for electric vehicle
  263. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  264. Lamination effects on a 3D model of the magnetic core of power transformers
  265. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  266. Detection of vertical disparity in three-dimensional visualizations
  267. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  268. Calculations of magnetic field in dynamo sheets taking into account their texture
  269. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  270. 3-dimensional computer model of electrospinning multicapillary unit used for electrostatic field analysis
  271. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  272. Optimization of wearable microwave antenna with simplified electromagnetic model of the human body
  273. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  274. Induction heating process of ferromagnetic filled carbon nanotubes based on 3-D model
  275. Special Issue: The 18th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering ISEF 2017
  276. Speed control of an induction motor by 6-switched 3-level inverter
Downloaded on 3.11.2025 from https://www.degruyterbrill.com/document/doi/10.1515/phys-2017-0002/html
Scroll to top button