User Function defination

aeroeng11 · October 8, 2011, 02:18

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, 06:00

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

aeroeng11 · October 8, 2011, 13:11

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

October 8, 2011, 02:18	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, 13:11	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.

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October 8, 2011, 06:00		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	This is straightforward to do as a CEL expression. Have a look at the tutorials for setting up CEL expressions.