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Square wave function/expression in CFX

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Old   November 17, 2016, 09:22
Default Square wave function/expression in CFX
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I am working on a transient analysis and am wondering if there is any way to write an expression which will give a square wave function over the duration of the analysis.
The situation is I am analysing the heat entering a brake disc during repeated braking. I want to model a heat flux on a surface but switch it on and off as the brakes are applied.
For example, is it possible to model a 30 second transient analysis with brakes/heat applied for 5 seconds and released (disc able to cool) for 5 seconds then repeated two more times to see the disc temperature at the end of the analysis?
The square wave would then give a heat flux of xxx W/sqm for time 0 to 5 seconds and zero W/sqm from 5 to 10 seconds. It could be a binary function which is multiplied by the flux value.

Last edited by Johndm; November 17, 2016 at 09:26. Reason: expanded explanantion
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Old   November 17, 2016, 10:46
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I think u can use if or step function:
if( cond_expr, true_expr, false_expr )
or
step ()
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Old   November 18, 2016, 19:22
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either vhat parviz said or tabular data:
You can inport tabular data via user function
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