Step function

ragazzaccio79 · May 23, 2011, 10:23

Dear all,

a very simple question about step function in CFX... sorry but i don't remember how to use it.

I am running a transient simulation and I need to impose a variable temperature at a wall domain as a function of time.

I need to set up an expression for temperature such that:

Temperature= 25° from 0sec up to 10sec included
Temperature= 40° from 11sec up to 20sec included
Temperature= 60° from 21sec up to 35sec included
Temperature= 100° from 36sec up to 60sec (60sec is the end of transient simulation)

Many thanks for your help.

Kind regards

ghorrocks · May 23, 2011, 20:01

You can generate this using step or if functions in CEL but it is easier to set up a function like this as a 1D interpolation function. Make it a function of time and use the function to set the temperature.

May 23, 2011, 10:23	Step function	#1
ragazzaccio79 New Member Join Date: May 2011 Posts: 4 Rep Power: 15	Dear all, a very simple question about step function in CFX... sorry but i don't remember how to use it. I am running a transient simulation and I need to impose a variable temperature at a wall domain as a function of time. I need to set up an expression for temperature such that: Temperature= 25° from 0sec up to 10sec included Temperature= 40° from 11sec up to 20sec included Temperature= 60° from 21sec up to 35sec included Temperature= 100° from 36sec up to 60sec (60sec is the end of transient simulation) Many thanks for your help. Kind regards

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help to create a CEL expression for Step function	anirudster	CFX	25	January 11, 2018 00:41
wall function UDFs...step	gina	Fluent UDF and Scheme Programming	7	June 2, 2009 15:04
Can anybody help me to solve the list errors while compiling Openfoam 15 on Opensuse 103 32bit	coompressor	OpenFOAM Installation	0	November 12, 2008 20:53
time step size in Custom Field Function	Tong	FLUENT	0	May 2, 2008 16:51
step function	John	CFX	4	October 20, 2005 01:39

May 23, 2011, 20:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	You can generate this using step or if functions in CEL but it is easier to set up a function like this as a 1D interpolation function. Make it a function of time and use the function to set the temperature.