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Old   June 5, 2007, 10:12
Default about expression
  #1
Jason
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Hi,all In the Inlet table,I choose to set "Static pressure".Now I want use an expression, the pressure=15000*t, t is time. How should I set the unit? I has tried many time and it doesn't work. Please do me a favor. Thanks in advance. Jason
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Old   June 5, 2007, 10:20
Default Re: about expression
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Jason
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If just set like this: Inlet pressure=15000*t,the warning come out as followed: Expression resolves to invalid units ('s') in value set for parameter 'Relative Pressure' in object '/FLOW/DOMAINomain 1/BOUNDARY:inlet/BOUNDARY CONDITIONS/MASS AND MOMENTUM'. Expected units: 'kg m^-1 s^-2'.
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Old   June 5, 2007, 10:21
Default Re: about expression
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Gert-Jan
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Pressure has to be in Pa. t is in [s]. So your constant 15000 has to be [Pa/s]. How difficult can it be?

Gert-Jan

www.bunova.nl
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Old   June 7, 2007, 04:15
Default Re: about expression
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Dr Flow Squad
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I Agree!

Or another way of doing it: 15000 [Pa] * t/1[s] -Dr Flow Squad
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