Step function

ragazzaccio79 · May 23, 2011, 09:23

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, 19:01

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, 09:23	Step function	#1
ragazzaccio79 New Member Join Date: May 2011 Posts: 4 Rep Power: 14	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

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May 23, 2011, 19:01		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	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.