离心泵CFX流场分析教程

Workshop SБайду номын сангаасpplement
4. When CFX-Pre opens, import the mesh by right-clicking on Mesh and selecting Import Mesh > ICEM CFD 5. Browse to pump.cfx5 6. Keep Mesh units in m 7. Click Open
Workbench 1. Start Workbench and save the project as centrifugalpump.wbpj 2. Drag CFX into the Project Schematic from the Component Systems toolbox 3. Start CFX-Pre by double clicking Setup
Workshop Supplement
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-9
April 28, 2009 Inventory #002599
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-7
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
Outlet Boundary Condition
Workshop Supplement
11. Make sure Rotation Axis under Axis Definition is set to Global Z 11. Switch to the Fluid Models tab, and set the following: 12. Turn on Homogeneous Model in the Multiphase section 13. Under Heat Transfer set the Option to Isothermal, with a Temperature of 25 C 14. Set Turbulence Option to Shear Stress Transport 15. Click OK
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WS5-8
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
Periodic Interface
– Click OK
Workshop Supplement
6. Back in the Material panel, select Water Vapour at 25 C
– Click OK
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Setting up the Fluid Domain
1. Double-click on Default Domain 2. Under Fluid and Particle Definitions, delete Fluid 1 and then create a new Fluid named Water Liquid 3. Set Material to Water 4. Create another new Fluid named Water Vapour 5. 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
1. Click to create an Interface, and name it Periodic 2. Set the Interface Type to Fluid Fluid 3. 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) 4. For Interface Side 2, set the Region List to DOMAIN INTERFACE 1 SIDE 2 and DOMAIN INTERFACE 2 SIDE 2 5. Set the Interface Models option to Rotational Periodicity 6. Under Axis Definition, select Global Z 7. Set Mesh Connection Option to 1:1 8. Click OK
Workshop Supplement
1. Insert a boundary condition named Inlet 2. On the Basic Settings tab, set Boundary Type to Inlet 3. Set Location to INLET 4. Set Frame Type to Stationary 5. Switch to the Boundary Details tab 6. Specify Mass and Momentum with a Normal Speed of 7.0455 [m/s] 7. Switch to the Fluid Values tab 8. For Water Liquid, set the Volume Fraction to a Value of 1 9. For Water Vapour, set the Volume Fraction to a Value of 0 10.Click OK
Modifying the material properties: 1. Expand Materials in the Outline tree 2. Double-click Water 3. On the Material Properties tab change Density to 1000 [kg/m3] 4. Change Dynamic Viscosity to 0.001 [kg m^-1 s^-1] under Transport Properties 5. Click OK
1. 2. 3. 4. 5. 6.
Workshop Supplement
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] 7. Enable the Pressure Option and set it to Opening Pressure 8. Set Turbulence Option to Zero Gradient 9. Switch to the Fluid Values tab 10.For Water Liquid, set the Volume Fraction to a Value of 1 11.For Water Vapour, set the Volume Fraction to a Value of 0 12.Click OK
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-3
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
Creating Working Fluids
Workshop 5 Cavitating Centrifugal Pump
Introduction to CFX
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-1
April 28, 2009 Inventory #002599
Workshop Supplement
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-2
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
Workshop Supplement
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-4
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
WS5-5
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
Setting up the Fluid Domain
7. Set the Reference Pressure to 0 [Pa] 8. Set Domain Motion to Rotating 9. Set Angular Velocity to 2160 [rev min^-1] 10. Switch on Alternate Rotation Model
WS5: Cavitating Centrifugal Pump
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.
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
WS5-6
April 28, 2009 Inventory #002599
WS5: Cavitating Centrifugal Pump
Inlet Boundary Condition