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Old   February 20, 2007, 04:25
Default Reg: Modeling hub leakage flow in CFX
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venkataramanan.R
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Hi,

If anyone has modelled hub leakage flow for an multistage axial compressor in CFX. We are generating the grid in Turbogrid. Turbogrid doesn't allow a patch surface to be created on the hub. The way that it can be done is to take the Turbo grid mesh into ICEM and create a patch surface in ICEM. Instead if there is anyother mehtod to avoid this incorporate this in CFX please let me know. It would be of great help.

Thanks Venkat

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Old   February 20, 2007, 11:30
Default Re: Reg: Modeling hub leakage flow in CFX
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Adam
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CFX have done it themselves, so it may be best to ask them directly
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Old   February 20, 2007, 11:37
Default Re: Reg: Modeling hub leakage flow in CFX
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Paul Lewis
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Hi Venkat,

I think the only way to do it without creating a new surface would be to create an expression in CEL which is a step function and apply it to the boundary.

i.e. over most of the hub the expression would be equal to zero (to represent a wall) and over a small area it is equal to the velocity you want to simulate (to represent inlet/outlet).

Cheers,

Paul
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Old   February 21, 2007, 08:46
Default Re: Reg: Modeling hub leakage flow in CFX
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Ribeiro
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Now in CFX-11 it is possible to create patches in CFX-Pre from original mesh just picking from surface mesh. Try that when you get version 11.0.

Cheers,
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