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-   -   How tensor parameters to be entered in CFX-pre? (http://www.cfd-online.com/Forums/cfx/117205-how-tensor-parameters-entered-cfx-pre.html)

hadi.iraji May 4, 2013 10:23

How tensor parameters to be entered in CFX-pre?
 
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hi
I m trying to simulate Flow through porous media and I'd enter the permeability parameter from a tensor.But I do not know how?
(ansys CFX-pre/defalt domaine/porous domaine/porosity setting/permeability)
(for Simulation of Vacuum Assisted Resin Transfer Molding process)

hadi.iraji May 4, 2013 10:25

help
 
?:confused:

hadi.iraji May 7, 2013 04:04

ANSYS CFX presently allows only K(permeability) to be isotropic ( Ansys CFX help)

evcelica May 10, 2013 14:01

You could try three different momentum sources (pourous loss model) one in each direction. Someone else had this idea, I've never tried it.

ghorrocks May 10, 2013 23:41

That's right. If you don't like the built in porous models you can always do your own.

But if he wants to specify it as a tensor it is a bit more complex - getting those high order terms in there will be tricky. But if all he wants is to specify a permeability in each direction this is easy to do with your own source term.

hadi.iraji May 11, 2013 11:27

yes.I wants is to specify a permeability in each direction .
but how?
ansys CFX only accepts scaler for permeability.
"easy to do with your own source term". How?

ghorrocks May 12, 2013 07:08

The CFX porosity model just generates a source term. There is a little tricky stuff for convergence, but mainly a source term. But you can write your own source terms, so then you could write your own source term which is a porosity model which works in any way you like. So this means do not use the built in porosity model, use a source term instead and you will have to write the equations of the source term yourself - of course.

hadi.iraji May 13, 2013 03:38

hi.
Thank you for answering my problem.
Where's sours equations can be entered. If possible, take an example.
THX

ghorrocks May 13, 2013 06:28

Look up source terms in the documentation.


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