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-   -   Not rotating hub at inlet and outlet (http://www.cfd-online.com/Forums/cfx/96756-not-rotating-hub-inlet-outlet.html)

mortezaastro January 31, 2012 09:17

Not rotating hub at inlet and outlet
 
Hello
I am trying to simulate the rotor of the radial inflow turbine. I create the geometry of rotor with Bladegen and create the mesh with Turbogrid. When I create the rotor geometry, two extended zones are created at inlet and outlet of rotor. The hub of this zones, shouldn't rotate. I know that I must set these portions of hub as counter rotating wall but I don't know how separate these portions from the hub in CFX or Turbogrid.
Please help me.
Thanks so much

Far February 4, 2012 06:31

This is not possible in Turbogrid and CFX.

The possible solutions are:

1. mesh the portion of hub, corresponding shroud and blade in turbogrid and non rotating inlet and outer portion in other meshing softwares (ICEM, Gridgen, Gambit, Ansys meshing) and the read all three meshes in CFX and create frozen rotor interface. You can also merge three meshes in ICEM as well.

2. you can separate the hub and shroud in Fluent in three parts and then you can import this mesh (single file) into CFX.

mm.abdollahzadeh June 11, 2012 06:02

Quote:

Originally Posted by Far (Post 342715)
This is not possible in Turbogrid and CFX.

The possible solutions are:

1. mesh the portion of hub, corresponding shroud and blade in turbogrid and non rotating inlet and outer portion in other meshing softwares (ICEM, Gridgen, Gambit, Ansys meshing) and the read all three meshes in CFX and create frozen rotor interface. You can also merge three meshes in ICEM as well.

2. you can separate the hub and shroud in Fluent in three parts and then you can import this mesh (single file) into CFX.

Dear all

I am a beginner in turbo machinery. I have one simple question. The Hub of Rotor Blade (NASA 67) has rotating part and non rotating part. I mean that if I extend the inlet and outlet, the new hub portion should be non rotating. is it important to the consider it in numerical simulation?
if I have run the Case with Nasa 67 rotor and although I can get the operating map, the distribution of relative mach number is not correct. Acctually the M=1 is occurring completely in incorrect place. I have tested different turbulence models. but the result was the same.
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