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Separator Chamber, Two-Phase Flow, ANSYS Fluent CFD Simulation Training

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The present problem simulates the collision of air and water flow within a separator chamber using ANSYS Fluent software.

This product includes a Mesh file and a comprehensive Training Movie.

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Description

Project Description

The present problem simulates the collision of air and water flow within a separator chamber using ANSYS Fluent software. In this modeling, a cylindrical separator chamber is designed whose interior space is full of water. Water then enters through a vertical pipe from the top of the chamber and exits through a bottom pipe located at the bottom of the chamber; While air flow enters from a horizontal tube on the lateral surface of the chamber and exits through a horizontal tube on the lateral surface of the upper part. The inlet air to the chamber has a mass flow rate of 0.001 kg.s-1 and the inlet water flow to the chamber has a mass flow rate of 0.1 kg.s-1.

Naturally, the water flow is located in the lower part of the chamber due to being denser and the air flow is located on the top of the water surface. Since there are two phases in this modeling, the multiphase model should be used. For this reason, the VOF multiphase model is used in this modeling; So that the primary phase is defined as water flow and the secondary phase is defined as air flow. Assuming that the water flow in the air flow is formed as a layer or free surface and does not mix with the air flow, the VOF model is the most appropriate model to define the present multiphase flow.

Also, the effect of surface tension between the two phases is defined and the amount of surface tension between the two phases of the water and air is defined as 0.072 N.m-1.

Separator Chamber Geometry & Mesh

The present model is designed in three dimensions using design Modeler software. The model consists of a cylindrical chamber that has two inlet and outlet pipes for water flow vertically and two inlet and outlet pipes for air horizontally.

separator chamber

We carry out the model’s meshing using ANSYS Meshing software, and the mesh type is unstructured. The element number is 972786. The following figure shows the mesh.

sparator chamber

Separator Chamber CFD Simulation

We consider several assumptions to simulate the present model:

  • We perform a pressure-based solver.
  • The simulation is steady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the vertical axis.

The following table represents a summary of the defining steps of the problem and its solution:

Models
Viscous k-epsilon
k-epsilon model standard
near wall treatment standard wall functions
Multiphase Model VOF
number of eulerian phases 2 (water & air)
formulation implicit
interface modeling dispersed
Boundary conditions
Inlet – Gas Mass Flow Inlet
mass flow rate – water 0 kg.s-1
mass flow rate – air 0.001 kg.s-1
Inlet – Liquid Mass Flow Inlet
mass flow rate – water 0.1 kg.s-1
mass flow rate – air 0 kg.s-1
Outlet – Gas Pressure Outlet
gauge pressure 0 pascal
Outlet – Liquid Pressure Outlet
gauge pressure 0 pascal
Walls Wall
wall motion stationary wall
Methods
Pressure-Velocity Coupling Coupled
Pressure PRESTO
momentum first order upwind
turbulent kinetic energy first order upwind
turbulent dissipation rate first order upwind
volume fraction first order upwind
Initialization
Initialization methods Standard
gauge pressure 0 Pascal
velocity (x,y,z) 0 m.s-1
air volume fraction 0
water volume fraction 1

Results & Discussions

At the end of the solution process, two-dimensional and three-dimensional contours related to the mixing pressure and mixing velocity and volume fraction of each of the water and air phases are obtained. The images show that the air flow moves upwards because it is lighter and the water flow moves downwards because it is denser.

There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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