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Old   October 5, 2008, 23:23
Default CFD Analysis of pump
  #1
remith
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hello can anyone help me in analysis of pump using CFD? I dont know how to use the effect of rotation in CFD. which mesh is better tetra or hexa? The software is ANSYS CFX.
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Old   October 5, 2008, 23:24
Default Re: CFD Analysis of pump *NM*
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remith
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Old   October 6, 2008, 03:36
Default Re: CFD Analysis of pump
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Amit Roghs
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Hi,

Hexa Mesh is best and to give rotation give the impeller

domain as rotating.
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Old   October 6, 2008, 06:42
Default Re: CFD Analysis of pump
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rohit
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Dear Remith,

Always hexa mesh is better than the tetra mesh, please go through the tutorial file "Flow in an Axial Rotor/Stator" for defining rotation
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Old   October 6, 2008, 07:00
Default Re: CFD Analysis of pump
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Rogerio Fernandes Brito
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Tetrahedron mesh is much more easy to build and for the first approaching, use this type of grid.
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Old   October 6, 2008, 07:07
Default Re: CFD Analysis of pump
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rohit
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i agree with Rogerio,

for your initial calculations you can go ahead with tetra mesh, but finally if you are looking for accuracy go with hexa mesh

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Old   October 6, 2008, 07:19
Default Re: CFD Analysis of pump
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Rogerio Fernandes Brito
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Even so for a good accuracy, if you use tetra with a good number of elements, it is not to be wondered at you will find a good result. BUT, itīs good to make a study of the independence of the grid.
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Old   October 6, 2008, 07:57
Default Re: CFD Analysis of pump
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rohit
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if you are looking at drag or seperation then it does not make sense to run a case with tetra cell. even if you have good number of cells in your domain.
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