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Introduction to CFX
Introduction
The Purpose of the tutorial is to model cavitation in a centrifugal pump, which involves the use of a rotation domain and the cavitation model.
The problem consists of a five blade centrifugal pump operating at 2160 rpm. The working fluid is water and flow is assumed to be steady and incompressible.
Due to rotational periodicity a single blade passage will be modeled.
The initial flow-field will be solved without cavitation. It will be turned on later.
Start Workbench and save the project as
Drag CFX into the Project Schematic from the Component Systems toolbox
Start CFX-Pre by double clicking Setup
When CFX-Pre opens, import the mesh by right-clicking on Mesh and selecting Import Mesh > ICEM CFD
Browse to
Keep Mesh units in m
Click Open
Workbench
Modifying the material properties:
Expand Materials in the Outline tree
Double-click Water
On the Material Properties tab change Density to 1000 [kg/m3]
Change Dynamic Viscosity to [kg m^-1 s^-1] under Transport Properties
Click OK
Creating Working Fluids
Setting up the Fluid Domain
Double-click on Default Domain
Under Fluid and Particle Definitions, delete Fluid 1 and then create a new Fluid named Water Liquid
Set Material to Water
Create another new Fluid named Water Vapour
Next to the Material drop-down list, click the “…” icon, then the Import Library Data icon (on the right of the form), and select Water Vapour at 25 C under the Water Data object
Click OK
Back in the Material panel, select Water Vapour at 25 C
Click OK
Setting up the Fluid Domain
Set the Reference Pressure to 0 [Pa]
Set Domain Motion to Rotating
Set Angular Velocity to 2160 [rev min^-1]
Switch on Alternate Rotation Model
Make sure Rotation Axis under Axis Definition is set to Global Z
Switch to the Fluid Models tab, and set the following:
Turn on Homogeneous Model in the Multiphase section
Under Heat Transfer set the Option to Isothermal, with a Temperature of 25 C
Set Turbulence Option to Shear Stress Transport
Click OK
Inlet Boundary Condition
Insert a boundary condition named Inlet
On the Basic Settings tab, set Boundary Type to Inlet
Set Location to INLET
Set Frame Type to Stationary
Switch to the Boundary Details tab
Specify Mass and Momentum with a Normal Speed of [m/s]
Switch to the Fluid Values tab
For Water Liquid, set the Volume Fraction to a Value of 1
For Water Vapour, set the Volume Fraction to a Value of 0
Click OK
Outlet Boundary Condition
Inset a boundary condition named Outlet
On the Basic Settings tab, set Boundary Type to Opening
Set Location to OUT
Set Frame Type to Stationary
Switch to the Boundary Details tab
Specify Mass and Momentum using Entrainment, and enter a Relative Pressure of 600,000 [Pa]
Enable the Pressure Option and set it to Opening Pressure
Set Turbulence Option to Zero Gradient
Switch to the Fluid Values tab
For Water Liquid, set the Volume Fraction to a Value of 1
For Water Vapour, set the Volume Fraction to a Value of 0
Click OK
Periodic Interface
Click to create an Interface, and name it Periodic
Set the Interface Type to Fluid Fluid
For Interface Side 1, set the Region List to DOMAIN INTERFACE 1 SIDE 1 and DOMAIN INTERFACE 2 SIDE 1 (use the “…” icon and the Ctrl key)
For Interface Side 2, set the Region List to DOMAIN INTERFACE 1 SIDE 2 and DOMAIN INTERFACE 2 SIDE 2
Set the Interface Models option to Rotational Periodicity
Under Axis Definition, select Global Z
Set Mesh Connection Option to 1:1
Click OK
Wall Boundary Conditions
Insert a boundary condition named Stationary
Set it to be a Wall, using the STATIONARY location
On the Boundary Details tab, enable a Wall Velocity and set it to Counter Rotating Wall
Click OK
In the Outline Tree, right-click on the Default Domain Default boundary and rename it to Moving
The default behavior for the Moving boundary condition is to move with the rotating domain, so there is nothing that needs to be set