User Function defination

aeroeng11 · October 8, 2011, 01:18

Hello all,
I am trying to enter an inflow condition in my CFD simulation. it is a periodic pulse function :q = ( $\overline{q}$ *t /\tau)*exp((1/2)*(1 - t^2/\tau^2))
how would I enter that as a user function in CFX pre?

t is the time
\tau is a constant
$\overline{q}$ is the mean volume flow rate

please assist
Thanks

ghorrocks · October 8, 2011, 05:00

This is straightforward to do as a CEL expression. Have a look at the tutorials for setting up CEL expressions.

aeroeng11 · October 8, 2011, 12:11

Thanks for the reply. It wa a bit of a task but I figured it. It works now.

October 8, 2011, 01:18	User Function defination	#1
aeroeng11 New Member Yash Mehta Join Date: Oct 2011 Posts: 2 Rep Power: 0	Hello all, I am trying to enter an inflow condition in my CFD simulation. it is a periodic pulse function :q = ( $\overline{q}$ t /\tau)exp((1/2)*(1 - t^2/\tau^2)) how would I enter that as a user function in CFX pre? t is the time \tau is a constant $\overline{q}$ is the mean volume flow rate please assist Thanks

October 8, 2011, 12:11	CEL help	#3
aeroeng11 New Member Yash Mehta Join Date: Oct 2011 Posts: 2 Rep Power: 0	Thanks for the reply. It wa a bit of a task but I figured it. It works now.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
OpenFOAM static build on Cray XT5	asaijo	OpenFOAM Installation	9	April 6, 2011 12:21
Problem with rhoSimpleFoam	matteo_gautero	OpenFOAM Running, Solving & CFD	0	February 28, 2008 06:51
[blockMesh] Axisymmetrical mesh	Rasmus Gjesing (Gjesing)	OpenFOAM Meshing & Mesh Conversion	10	April 2, 2007 14:00
User Defined Function for convection coefficient	ereiss	FLUENT	1	July 8, 2004 16:10
User define flux function	kethireddy	FLUENT	0	July 5, 2004 04:53

October 8, 2011, 05:00		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	This is straightforward to do as a CEL expression. Have a look at the tutorials for setting up CEL expressions.