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# Eulerian Two Phase Flow in a Moving Wall Cylinder, ANSYS Fluent Training

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The aim of this project is to investigate the effect of the rotating wall on Eulerian multi-phase turbulent flow.

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

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## Project Description (Eulerian)

The system consists of two different fluids, including water as the primary fluid and one secondary fluid (with a density of 2610 kg.m-3 and a viscosity of 0.0026 kg.m-1.s-1). Therefore, to define the flow of two fluids in the system, the Eulerian multiphase model has been used. The two-phase flow enters the chamber in the form of a hollow cylinder.

The water fluid enters the cylindrical system with a velocity of 0.629 m.s-1 and a volume fraction of 0.67, the secondary fluid with a velocity of 0.099 m.s-1 and a volumetric fraction of 0.23 and under relative pressure conditions of 1379000 pascals. The outer wall of the cylinder is stationary, while the inner wall is moving wall and has a rotational speed around the central axis of the cylinder of 30 rpm. The aim of this project is to investigate the effect of the rotating wall on Eulerian multi-phase turbulent flow.

## Geometry & Mesh

The 3-D geometry of the present model is carried out using Design Modeler software. The geometry of the model consists of two outer and inner cylinders, through which the two-phase fluid flows through the space between the two outer and inner walls. The input and output of the model are in the form of hollow circles. The figure below shows an overview of the model’s geometry. The meshing of the present model has been done using ANSYS Meshing software. The mesh type is unstructured and the element number is 11,880. The figure below shows an overview of the performed mesh. ## CFD Simulation (Eulerian)

To simulate the present model, several assumptions are considered, which are:

• The solver is pressure-based.
• Simulation has only examined fluid behavior; in other words, heat transfer simulation has not been performed.
• The present model is Steady in terms of time; in fact, due to the application of constant rotational speed for the wall, the effect of the term of the time can be separated from the solution process.
• The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the z-axis in the present model.

The following is a summary of the steps for defining the problem and its solution:

 Models (Eulerian) k-omega Viscous model standard k-omega model shear flow corrections k-omega options dispersed turbulence multiphase model Eulerian Multiphase model water and secondary phase phases implicit formulation Boundary conditions velocity-inlet Inlet 1379000 pascal supersonic/initial gauge pressure mixture 0.629 m.s-1 velocity magnitude water 0.67 volume fraction 0.099 m.s-1 velocity magnitude secondary phase 0.23 volume fraction Pressure outlet Outlet 1379000 pascal gauge pressure mixture 1 backflow volume fraction water 0 backflow volume fraction secondary phase wall Inner wall stationary wall (0 rpm) wall motion Outer wall moving wall (30 rpm) wall motion Solution Methods Phase Coupled SIMPLE Pressure-velocity coupling PRESTO pressure Spatial discretization first-order upwind momentum first-order upwind specific dissipation rate first-order upwind volume fraction Initialization Standard Initialization method 0 m.s-1 water velocity (x,y,z) 0 pascal gauge pressure 0 m.s-1 water velocity (x,y,z) 1 the secondary phase volume fraction

### Turbulence Model

In the present model, the standard k-omega turbulence model with shear flow correction capability and the dispersed turbulence model for multi-phase flow are considered.

## Results (Eulerian)

After the solution process, the two-dimensional and three-dimensional contours related to pressure (for mixing), velocity (for water phase and secondary fluid phase), the volume fraction of water and secondary fluid, as well as path lines (water and secondary fluid), have been obtained. Two-dimensional contours are presented in two sections, YZ, and XY. The YZ section is defined as passing through the central axis of the cylinder and the XY section is defined perpendicular to the central axis of the cylinder at intervals of 4, 9 and 13.716 (output) meters from the input section.

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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