离心泵CFX流场分析教程课件.ppt
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1、ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.WS5-1April 28,2009Inventory#002599Workshop 5Cavitating Centrifugal PumpIntroduction to CFXANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-2April 28,2009Inventory#002599Introduction
2、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
3、 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.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-3April 28,2009Inventory#002599Start Wor
4、kbench and save the project as centrifugalpump.wbpjDrag CFX into the Project Schematic from the Component Systems toolboxStart CFX-Pre by double clicking SetupWhen CFX-Pre opens,import the mesh by right-clicking on Mesh and selecting Import Mesh ICEM CFDBrowse to pump.cfx5Keep Mesh units in mClick O
5、penWorkbench ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-4April 28,2009Inventory#002599Modifying the material properties:Expand Materials in the Outline treeDouble-click Water On the Material Properties tab change Density to 1000 kg/
6、m3 Change Dynamic Viscosity to 0.001 kg m-1 s-1 under Transport Properties1.Click OKCreating Working FluidsANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-5April 28,2009Inventory#002599Setting up the Fluid DomainDouble-click on Default D
7、omainUnder Fluid and Particle Definitions,delete Fluid 1 and then create a new Fluid named Water LiquidSet Material to WaterCreate another new Fluid named Water VapourNext to the Material drop-down list,click the“”icon,then the Import Library Data icon(on the right of the form),and select Water Vapo
8、ur at 25 C under the Water Data objectClick OKBack in the Material panel,select Water Vapour at 25 CClick OKANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-6April 28,2009Inventory#002599Setting up the Fluid DomainSet the Reference Pressu
9、re to 0 PaSet Domain Motion to RotatingSet Angular Velocity to 2160 rev min-1Switch on Alternate Rotation ModelMake sure Rotation Axis under Axis Definition is set to Global ZSwitch to the Fluid Models tab,and set the following:Turn on Homogeneous Model in the Multiphase sectionUnder Heat Transfer s
10、et the Option to Isothermal,with a Temperature of 25 CSet Turbulence Option to Shear Stress TransportClick OKANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-7April 28,2009Inventory#002599Inlet Boundary ConditionInsert a boundary conditio
11、n named InletOn the Basic Settings tab,set Boundary Type to InletSet Location to INLETSet Frame Type to StationarySwitch to the Boundary Details tabSpecify Mass and Momentum with a Normal Speed of 7.0455 m/sSwitch to the Fluid Values tabFor Water Liquid,set the Volume Fraction to a Value of 1For Wat
12、er Vapour,set the Volume Fraction to a Value of 0Click OKANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-8April 28,2009Inventory#002599Outlet Boundary ConditionInset a boundary condition named OutletOn the Basic Settings tab,set Boundary
13、 Type to OpeningSet Location to OUTSet Frame Type to StationarySwitch to the Boundary Details tabSpecify Mass and Momentum using Entrainment,and enter a Relative Pressure of 600,000 PaEnable the Pressure Option and set it to Opening PressureSet Turbulence Option to Zero GradientSwitch to the Fluid V
14、alues tabFor Water Liquid,set the Volume Fraction to a Value of 1For Water Vapour,set the Volume Fraction to a Value of 0Click OKANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-9April 28,2009Inventory#002599Periodic InterfaceClick to cre
15、ate an Interface,and name it PeriodicSet the Interface Type to Fluid FluidFor 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 SI
16、DE 2Set the Interface Models option to Rotational PeriodicityUnder Axis Definition,select Global ZSet Mesh Connection Option to 1:1Click OKANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-10April 28,2009Inventory#002599Wall Boundary Condi
17、tionsInsert a boundary condition named StationarySet it to be a Wall,using the STATIONARY locationOn the Boundary Details tab,enable a Wall Velocity and set it to Counter Rotating WallClick OKIn the Outline Tree,right-click on the Default Domain Default boundary and rename it to MovingThe default be
18、havior for the Moving boundary condition is to move with the rotating domain,so there is nothing that needs to be setANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Cavitating Centrifugal PumpWS5-11April 28,2009Inventory#002599InitializationClick to initialize the sol
19、utionOn the Fluid Settings form,set Water Liquid Volume Fraction to Automatic with Value,and set the Volume Fraction to 1Set Water Vapour Volume Fraction to Automatic with Value,and set the Volume Fraction to 0Click OKANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.Workshop SupplementWS5:Ca
20、vitating Centrifugal PumpWS5-12April 28,2009Inventory#002599Solver ControlDouble click Solver Control in the Outline treeSet Timescale Control to Physical timescaleA commonly used timescale in turbomachinery is 1/omega,where omega is the rotation rate in radians per second.You can use an expression
21、to determine a timestep 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-5On the Advanced Options tab,turn on Multiphase Control,then turn on Volume Fraction Coupling and
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