How tensor parameters to be entered in CFX-pre?

hadi.iraji · May 4, 2013, 10:23

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

?

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.

May 4, 2013, 10:25	help	#2
hadi.iraji New Member hadi Join Date: Apr 2013 Posts: 16 Rep Power: 12	?

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May 7, 2013, 04:04		#3
hadi.iraji New Member hadi Join Date: Apr 2013 Posts: 16 Rep Power: 12	ANSYS CFX presently allows only K(permeability) to be isotropic ( Ansys CFX help)

May 10, 2013, 14:01		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	You could try three different momentum sources (pourous loss model) one in each direction. Someone else had this idea, I've never tried it.

May 10, 2013, 23:41		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	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.

May 11, 2013, 11:27		#6
hadi.iraji New Member hadi Join Date: Apr 2013 Posts: 16 Rep Power: 12	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?

May 12, 2013, 07:08		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	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.

May 13, 2013, 03:38		#8
hadi.iraji New Member hadi Join Date: Apr 2013 Posts: 16 Rep Power: 12	hi. Thank you for answering my problem. Where's sours equations can be entered. If possible, take an example. THX

May 13, 2013, 06:28		#9
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Look up source terms in the documentation.