scholarly journals Thermal two-phase flow with a phase-field method

2018 ◽  
Vol 100 ◽  
pp. 77-85
Author(s):  
Keunsoo Park ◽  
Maria Fernandino ◽  
Carlos A. Dorao
Keyword(s):  
Phase Field ◽  
Two Phase Flow ◽  
Field Method ◽  
Phase Field Method ◽  
Phase Flow ◽  
Two Phase

Development of meshless phase field method for two-phase flow

2018 ◽  
Vol 108 ◽  
pp. 169-180 ◽  
Author(s):  
Nazia Talat ◽  
Boštjan Mavrič ◽  
Grega Belšak ◽  
Vanja Hatić ◽  
Saša Bajt ◽  
...  
Keyword(s):  
Phase Field ◽  
Two Phase Flow ◽  
Field Method ◽  
Phase Field Method ◽  
Phase Flow ◽  
Two Phase

A phase field method pore-scale model for simulating kinetic interface sensitive tracers reactive transport in porous media two-phase flow systems

2020 ◽  
Author(s):  
Huhao Gao ◽  
Alexandru Tatomir ◽  
Nikolaos Karadimitriou ◽  
Martin Sauter
Keyword(s):  
Diffusion Process ◽  
Phase Field ◽  
Reactive Transport ◽  
Two Phase Flow ◽  
Interfacial Area ◽  
Field Method ◽  
Phase Field Method ◽  
Phase Flow ◽  
Pore Scale ◽  
Two Phase

<p>Over the last few years, our understanding of the processes involved in the application of Kinetic Interfacial Sensitive (KIS) tracers in two-phase flow as a means to quantify the fluid-fluid interfacial area has been enhanced with the use of controlled column experiments (Tatomir et al. 2015,2018). However, there are still some open questions regarding the effect of immobile water, either as capillary and dead-end trapped water or as a film, and the measured by product concentration at the outflow.</p><p>In this study, a new pore-scale reactive transport model is presented, based on the phase-field method, which is able to deal with the KIS tracer interfacial reaction and selective distribution of the by-production into the water phase. The model is validated by comparing the analytical solutions for a diffusion process across the interface and a reaction-diffusion process, and is tested for a drainage process in a capillary tube for different Péclet numbers. The applicability of the model is demonstrated in a realistic 2D porous medium NAPL/water drainage scenario used in the literature. Four case studies are investigated in detail to obtain macroscopic parameters, like saturation, capillary pressure, specific interfacial area, and concentration, for a number of combinations between the inflow rate, the contact angle and diffusivity. We derive a relation between the by-product mass at the outflow and the mobile part of the interfacial area, which is formulated by adding a residual factor. This term relates to the part of the by-product produced by mobile interface that becomes residual in the immobile zones.</p>

A stabilized phase-field method for two-phase flow at high Reynolds number and large density/viscosity ratio

2019 ◽  
Vol 397 ◽  
pp. 108832 ◽  
Author(s):  
Zhicheng Wang ◽  
Suchuan Dong ◽  
Michael S. Triantafyllou ◽  
Yiannis Constantinides ◽  
George Em Karniadakis
Keyword(s):  
Reynolds Number ◽  
Phase Field ◽  
High Reynolds Number ◽  
Two Phase Flow ◽  
Viscosity Ratio ◽  
Field Method ◽  
Phase Field Method ◽  
Phase Flow ◽  
Two Phase ◽  
High Reynolds

Numerical Simulation of Microscopic Formation of Carbon Dioxide Hydrate in Two-Phase Flow

2021 ◽  
Author(s):  
Alan Junji Yamaguchi ◽  
Kaito Kobayashi ◽  
Toru Sato ◽  
Takaomi Tobase
Keyword(s):  
Carbon Dioxide ◽  
Carbon Capture ◽  
Two Phase Flow ◽  
Pore Space ◽  
Carbon Capture And Storage ◽  
Hydrate Formation ◽  
Field Method ◽  
Phase Field Method ◽  
Phase Flow ◽  
Two Phase

Abstract The global warming is an important environmental concern and the carbon capture and storage (CCS) emerges as a very promising technology. Captured carbon dioxide (CO2) can be stored onshore or offshore in the aquifers. There is, however, a risk that stored CO2 will leak due to natural disasters. One possible solution to this is the natural formation of CO2 hydrates. Gas hydrate has an ice-like structure in which small gas molecules are trapped within cages of water molecules. Hydrate formation occurs under high pressure and low temperature conditions. Its stability under these conditions acts like a cap rock to prevent CO2 leaks. The main objective of this study is to understand how hydrate formation affects the permeability of leaked CO2 flows. The phase field method was used to simulate microscopic hydrate growth within the pore space of sand grains, while the lattice Boltzmann method was used to simulate two-phase flow. The results showed that the hydrate morphology within the pore space changes with the flow, and the permeability is significantly reduced as compared with the case without the flow.

MODELLING TWO–PHASE FLOW IN MICROFLUIDIC DEVICES

2003 ◽  
Vol 790 ◽  
Author(s):  
Mario De Menech
Keyword(s):  
Two Phase Flow ◽  
Microfluidic Devices ◽  
Field Method ◽  
Droplet Breakup ◽  
Diffuse Interface ◽  
Phase Field Method ◽  
Phase Flow ◽  
Two Phase ◽  
Wetting Properties ◽  
Complex Phenomena

ABSTRACTA phase–field method is used to model two–phase flow in microfluidic devices, where capillary and viscous stresses dominate over inertial forces. Dissipative and reactive couplings in the hydrodynamic equations are derived from a Cahn–Hilliard–van der Waals free energy, which accounts for the equilibrium thermodynamics of the fluid system, including phase behavior, interfacial tension and wetting properties. The singularities inherent to the free boundary description are smoothed out by the presence of a diffuse interface over which interfacial stresses are distributed, such that complex phenomena like droplet breakup and coalescence or contact line dynamics can be resolved numerically. The reliability of the scheme used to solve the discretized transport equations is tested against different benchmarks for free flow conditions. The model is then applied to the simulation of the flow of droplets in microdevices, resulting in a satisfactory agreement with the behavior observed in experiments.

Direct Numerical Simulation of Flow on Pore-Scale Images Using the Phase-Field Method

SPE Journal ◽  
2018 ◽  
Vol 23 (05) ◽  
pp. 1833-1850 ◽  
Author(s):  
Florian Frank ◽  
Chen Liu ◽  
Faruk O. Alpak ◽  
Steffen Berg ◽  
Beatrice Riviere
Keyword(s):  
Numerical Simulation ◽  
Phase Field ◽  
Field Method ◽  
Phase Field Method ◽  
Momentum Balance ◽  
Phase Flow ◽  
Pore Scale ◽  
Balance Equations ◽  
Two Phase ◽  
Validation Tests

Summary Advances in pore-scale imaging, increasing availability of computational resources, and developments in numerical algorithms have started rendering direct pore-scale numerical simulations of multiphase flow on pore structures feasible. In this paper, we describe a two-phase-flow simulator that solves mass- and momentum-balance equations valid at the pore scale (i.e., at scales where the Darcy velocity homogenization starts to break down). The simulator is one of the key components of a molecule-to-reservoir truly multiscale modeling work flow. A Helmholtz free-energy-driven, thermodynamically based diffuse-interface/phase-field method is used for the effective simulation of numerous advecting interfaces, while honoring the interfacial tension (IFT). The advective Cahn-Hilliard (CH) (mass-balance, energy dissipation) and Navier-Stokes (NS) (momentum-balance, incompressibility) equations are coupled to each other within the phase-field framework. Wettability on rock/fluid interfaces is accounted for by means of an energy-penalty-based wetting (contact-angle) boundary condition. Individual balance equations are discretized by use of a flexible discontinuous Galerkin (DG) method. The discretization of the mass-balance equation is semi-implicit in time using a convex/concave splitting of the energy term. The momentum-balance equation is split from the incompressibility constraint by a projection method and linearized with a Picard splitting. Mass- and momentum-balance equations are coupled to each other by means of operator splitting, and are solved sequentially. We discuss the mathematical model and its DG discretization, and briefly introduce nonlinear and linear solution strategies. Numerical-validation tests show optimal convergence rates for the DG discretization, indicating the correctness of the numerical scheme and its implementation. Physical-validation tests demonstrate the consistency of the phase distribution and velocity fields simulated within our framework. Finally, two-phase-flow simulations on two real pore-scale images demonstrate the usefulness of the pore-scale simulator. The direct pore-scale numerical-simulation methodology rigorously considers the flow physics by directly acting on pore-scale images of rocks without remeshing. The proposed method is accurate, numerically robust, and exhibits the potential for tackling realistic problems.

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