Constant mean WSS

az_f · August 15, 2011, 01:48

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?

August 15, 2011, 01:48	Constant mean WSS	#1
az_f Member Join Date: Mar 2009 Posts: 48 Rep Power: 17	Hi How can I apply constant mean WSS at inlet? Is that the same concept of constant velocity?? Thanks

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Chemical properties that are used in Fluent	kimej	FLUENT	4	August 19, 2011 11:29
Constant Volume Combustion with reactingFoam	Alish1984	OpenFOAM Running, Solving & CFD	2	May 8, 2011 08:51
How to install CGNS under windows xp?	lzgwhy	Main CFD Forum	1	January 11, 2011 18:44
CGNS lib and Fortran compiler	manaliac	Main CFD Forum	2	November 29, 2010 06:25
Really big problems when creating own materials da	Jop	FLUENT	0	June 28, 2007 11:15

August 15, 2011, 13:14		#2
sajad_abasi Member sajad Join Date: Nov 2010 Posts: 51 Rep Power: 15	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?

August 15, 2011, 18:54		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,719 Rep Power: 143	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.

August 15, 2011, 22:23		#4
az_f Member Join Date: Mar 2009 Posts: 48 Rep Power: 17	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

August 16, 2011, 06:43		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,719 Rep Power: 143	I just told you how to do it. Please read my previous post.

August 16, 2011, 08:02		#6
sajad_abasi Member sajad Join Date: Nov 2010 Posts: 51 Rep Power: 15	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?