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-   -   Reg: Modeling hub leakage flow in CFX (http://www.cfd-online.com/Forums/cfx/23663-reg-modeling-hub-leakage-flow-cfx.html)

venkataramanan.R February 20, 2007 04:25

Reg: Modeling hub leakage flow in CFX
 
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


Adam February 20, 2007 11:30

Re: Reg: Modeling hub leakage flow in CFX
 
CFX have done it themselves, so it may be best to ask them directly

Paul Lewis February 20, 2007 11:37

Re: Reg: Modeling hub leakage flow in CFX
 
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

Ribeiro February 21, 2007 08:46

Re: Reg: Modeling hub leakage flow in CFX
 
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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