Boundary Condition (variable Umax)

Eli · April 3, 2010, 15:29

Hi Pals
I wanna set an expression for inlet boundary condition.
that's it:
u=Umax(t)[1-r^2/R^2]

No problem so far!
but I want it to pick up the Umax(t) from the specified cyclic curve in every timestep!
How can I do that?

thanks alot

ghorrocks · April 4, 2010, 07:35

If you know the Umax function then write it as a CEL expression. Otherwise use an interpolation function to define the Umax expression.

Eli · April 4, 2010, 10:19

Thank you soooo much
I appreciate your help.
I think I should use an interpolation function.

Best regards

April 3, 2010, 15:29	Boundary Condition (variable Umax)	#1
Eli New Member Join Date: Mar 2009 Posts: 18 Rep Power: 10	Hi Pals I wanna set an expression for inlet boundary condition. that's it: u=Umax(t)[1-r^2/R^2] No problem so far! but I want it to pick up the Umax(t) from the specified cyclic curve in every timestep! How can I do that? thanks alot

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Calculated gradient boundary condition similar to gammaContactAngle	adona058	OpenFOAM Running, Solving & CFD	0	September 26, 2007 15:23
Slip boundary condition what is inside	normunds	OpenFOAM Running, Solving & CFD	2	June 4, 2007 06:45
Additional variable - wall boundary condition	flga	CFX	2	May 30, 2007 03:14
1 and 2 Order Boundary condition at the same place	CFD_Flo	Main CFD Forum	4	July 11, 2005 11:57
Pressure Boundary Condition	Matt Umbel	Main CFD Forum	0	January 11, 2002 11:06

April 4, 2010, 07:35		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,616 Rep Power: 105	If you know the Umax function then write it as a CEL expression. Otherwise use an interpolation function to define the Umax expression.

April 4, 2010, 10:19		#3
Eli New Member Join Date: Mar 2009 Posts: 18 Rep Power: 10	Thank you soooo much I appreciate your help. I think I should use an interpolation function. Best regards