Multiphase Flow in Porous Medium, CFD Simulation
The present problem simulates multiphase flow in a porous medium using ANSYS Fluent software.
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Multiphase Flow in a Porous Medium Project Description
The present problem simulates multiphase flow in a porous medium using ANSYS Fluent software. Water flow with a relative pressure of 100,000 pascals and a temperature of 288.15 K enters from the top of a vertical column. It enters a porous media at the end of the column. This porous medium is made of aluminum and has a porosity coefficient (ratio of the volume of cavities or fluid space to the total volume) equal to 0.6. The model is designed in two parts; So that in the upper part of the column, there are water-soluble particles, and in the lower part of the column, the porous medium is located. Initially, there is a solution with a volume fraction of 0.185 of the particles in the water.
By entering the water flow from the top of the column and applying pressure to the mixture inside the column, and passing through the pores of the porous medium, the soluble particles are separated from the water flow. Since in this project, two phases are mixed, a multiphase flow must be defined. Therefore, in the present simulation, a multiphase model is used; So that its primary phase is liquid water and its secondary phase is water-soluble particles (sludge). The secondary phase is defined as having a density of 2400 kg.m-3 and a specific heat capacity of 4180 j.kg-1.K-1 and thermal conductivity of 0.0454 Wm-1.K-1 and a viscosity of It are based on power law. To define the multiphase model, the Eulerian model is used.
This model is known as the most complex multiphase software model and can solve a set of momentum and energy equations for each of the phases separately. Eulerian multiphase model is used to simulate such things as bubble flows, droplet flows, vertical risers, cyclones, fluidized bed, bubble columns, slurry flows, sedimentation phenomenon, and particle suspension phenomenon.
Geometry & Mesh
The present model is designed in two dimensions using Design Modeler software. The model is designed as a column with a height of 0.08 m and a width of 0.0125 m. The computational area is divided into two parts; So that the lower part of the column is related to the porous medium. Due to the symmetrical structure of the model geometry, only half of the geometry is modeled, and a symmetry boundary condition is used.
We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is structured. The element number is 572852. The following figure shows the mesh.
Multiphase Flow in a Porous Medium CFD Simulation
We consider several assumptions to simulate the present model:
- We perform a pressure-based solver.
- The simulation is unsteady.
- The gravity effect on the fluid is equal to -9.81 m.s-2 along the Y-axis.
The following table represents a summary of the defining steps of the problem and its solution:
|Models (Multiphase Flow / Porous Medium)|
|near wall treatment||standard wall functions|
|turbulence multiphase model||mixture|
|number of eulerian phases||2 (water & sludge)|
|Boundary conditions (Multiphase Flow / Porous Medium)|
|gauge total pressure||100000|
|temperature – water||288.15 K|
|volume fraction – water||1|
|temperature – sludge||288.15 K|
|volume fraction – sludge||0|
|gauge pressure||0 pascal|
|wall motion||stationary wall|
|heat flux||0 W.m-2|
|Methods (Multiphase Flow / Porous Medium)|
|momentum||first order upwind|
|turbulent kinetic energy||first order upwind|
|turbulent dissipation rate||first order upwind|
|volume fraction||first order upwind|
|energy||first order upwind|
|Initialization (Multiphase Flow / Porous Medium)
|gauge pressure||0 Pascal|
|x-velocity – water & sluge||0 m.s-1|
|y-velocity – water & sludge||-14.15488 m.s-1|
|temperature – water & sludge||288.15 K|
|volume fraction – sludge||0 (patch=0.185)|
Results & Discussions
At the end of the solution process, two-dimensional contours related to the mixture pressure, primary phase velocity, primary phase temperature, primary phase volume fraction, secondary phase velocity, secondary phase temperature, and secondary phase volume fraction are obtained. The results show that when the water flow inside the column moves downwards, the mixed flow moves towards the porous medium. The behavior of the mixture indicates that the water-soluble particles do not pass through the porous medium and only the water flow passes. As a result, the soluble particles are separated from the water flow.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.