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Old   August 2, 2006, 08:56
Default CFX-Pre Expression
  #1
Roland
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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=<t=<60s I would need an expression like: T=300[K]+Time*10.39[K s^-1]

And for t>60s I would need the expression T=923,4K

But how can I combine this?
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Old   August 2, 2006, 09:16
Default Re: CFX-Pre Expression
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opaque
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Dear Roland,

Please read the documentation about the CEL step function.. It is meant for this type of situation..

Opaque..

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Old   August 2, 2006, 10:18
Default Re: CFX-Pre Expression
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Ram Dayal
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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
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Old   August 2, 2006, 10:29
Default Re: CFX-Pre Expression
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Roland
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Thank you, it worked with the step function
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