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-   -   Constant mean WSS (http://www.cfd-online.com/Forums/cfx/91542-constant-mean-wss.html)

az_f August 15, 2011 01:48

Constant mean WSS
 
Hi
How can I apply constant mean WSS at inlet? Is that the same concept of constant velocity??

Thanks

sajad_abasi August 15, 2011 13:14

hi.
what do you mean a constant wss at inlet?
wall shear strees depends on velocity gradiant no on velocity.

could you expllain your problem more?

ghorrocks August 15, 2011 18:54

If you want to do constant wall shear stress then just define the wall shear stress to be a constant value. Use the specified shear option in CFX-Pre.

az_f August 15, 2011 22:23

Because of different size of vessel in different patient, some people assume that applying constant value for mean WSS at inlet for example basilar artery is the right assumption for patient specific modeling.But I don't know how we can apply it in Cfx-pre?
Any idea?

Thanks

ghorrocks August 16, 2011 06:43

I just told you how to do it. Please read my previous post.

sajad_abasi August 16, 2011 08:02

im not sure but i think constant WSS is applied on artery wall not as an inlet boundary condition.
check your artery wall and you will see that in "boundary detail" in "mass and momentum" the defualt is "no slip " for wall.but you can set "free slip wall"...or...."especifed shear" too.

i hope i could help you..

can you say me what is yous problem in general?


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