# CFX-Pre Expression

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 August 2, 2006, 08:56 CFX-Pre Expression #1 Roland Guest   Posts: n/a Hello, who can help me? I want to create an expression as a function of time At t=0s I want a Temperature of 300K then until t=60s T shoulp be equal to 923.4 K then after t>60s T should be stable at the level of 923.4 K. So how can I get an expression with this time Steps? For 0s=60s I would need the expression T=923,4K But how can I combine this?

 August 2, 2006, 09:16 Re: CFX-Pre Expression #2 opaque Guest   Posts: n/a Dear Roland, Please read the documentation about the CEL step function.. It is meant for this type of situation.. Opaque..

 August 2, 2006, 10:18 Re: CFX-Pre Expression #3 Ram Dayal Guest   Posts: n/a Dear Roland Use min function. first calculate T1=300[K]+Time*10.39[K s^-1],then T2=923.4[K] then T=min(T1,T2). I think this should work. Bye Ram Dayal

 August 2, 2006, 10:29 Re: CFX-Pre Expression #4 Roland Guest   Posts: n/a Thank you, it worked with the step function

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