Reverse Osmosis, CFD Simulation Ansys Fluent Training


In this project, reverse osmosis has been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Project Description

In this project, we simulated reverse osmosis by Ansys Fluent software, The reverse osmosis mechanism is simulated. This mechanism is used to purify water so that a membrane is placed in front of the water movement and does not allow the salts in the water to leave and pure water leaves. Eulerian Multiphase model has been used in this project. Inlet water velocity is 0.01 m/s, the volume fraction of solutes is 0.02, And the membrane layer is simulated as a porous medium.

Geometry & Mesh

The two-dimensional geometry of this project has been produced with Spaceclaim software The length of the calculation domain is 100 mm and its height is 50mm.

Reverse Osmosis

The meshing of this project has been done with Ansys Meshing software and the type of elements is structured. Also, the total number of elements is 44800.

 Reverse Osmosis

Reverse Osmosis CFD Simulation

We consider several assumptions in this simulation:

  1. the pressure-based solver method has been selected.
  2. The simulation is transient.
  3. We consider the gravity effect in the y-direction

The following tables represent a summary of the defining steps of the problem in this project and its solution:

Viscous model k-epsilon
Model standard
Multiphase model Eulerian
Primary phase water
Secondary phase Salt
Boundary conditions
Inlet velocity  inlet
Velocity magnitude 0.01 m/s
Outlet Pressure outlet
Gauge pressure 0 pa
Walls Stationary wall
Solution Methods
Pressure-velocity coupling   Coupled
Spatial discretization Pressure Second-order
Momentum Frist-order upwind
Turbulent kinetic energy first-order upwind
Turbulent dissipation rate first-order upwind
Initialization method   Standard



During the simulation, we see that the salts in the water can not leave the membrane layer and are trapped behind it, and the filtered water comes out.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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