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1、Workshop 5 Cavitating Centrifugal Pump,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 wor
2、king 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 centrifugalpump.wbpj Drag CFX i
3、nto 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 pump.cfx5 Keep Mesh units in m Click Open,Workbench,Modifying the material properties: Expand
4、 Materials in the Outline tree Double-click Water On the Material Properties tab change Density to 1000 kg/m3 Change Dynamic Viscosity to 0.001 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 D
5、efinitions, 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
6、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 Defini
7、tion 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 b
8、oundary 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 7.0455 m/s Switch to the Fluid Values tab For Water Liquid, set the Volume Fracti
9、on 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
10、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
11、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,
12、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 b
13、e 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 w
14、ith the rotating domain, so there is nothing that needs to be set,Initialization,Click to initialize the solution On the Fluid Settings form, set Water Liquid Volume Fraction to Automatic with Value, and set the Volume Fraction to 1 Set Water Vapour Volume Fraction to Automatic with Value, and set t
15、he Volume Fraction to 0 Click OK,Solver Control,Double click Solver Control in the Outline tree Set Timescale Control to Physical timescale A commonly used timescale in turbomachinery is 1/omega, where omega is the rotation rate in radians per second. You can use an expression to determine a timeste
16、p from this. In this case, 2/omega will be used to achieve faster convergence. Enter the following expression in the Physical Timescale box: 1/(pi*2160 min-1) Set Residual Target to 1e-5 On the Advanced Options tab, turn on Multiphase Control, then turn on Volume Fraction Coupling and set the Option to Coupled Click OK,Output Control,Double Click on Output Control in the Outline tree On the Monitor tab, turn on Monitor Options Under Monitor Points and Expressions,
