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Use of Tu for user expression

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Old   August 7, 2006, 07:55
Default Use of Tu for user expression
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Adam
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Has anyone successfully used the turbulence intenstity (Tu) in a user expression or subroutine?

Even though it is a user input option it doesn't seem possible for the user to utilise it in any expression or routine.

Regards

Adam
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Old   August 8, 2006, 03:21
Default Re: Use of Tu for user expression
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James Date
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Why don't you set it as a constant in the CEL expression language and then you can use it anywhere, even to set Tu on the inlet boundary. You could set up the following CEL expressions, which will allow you to calculate Tu and Epsilon:

UsrFlowSpeed = 10 [m s^-1]

UsrChord = 1.0 [m]

UsrDynamicViscosity = 0.0016 [kg m^-1 s^-1]

UsrDensity = 1028 [kg m^-3]

UsrTurbIntensity = 0.003

UsrInletK = 3.0*((UsrTurbIntensity^2)*UsrFlowSpeed^2)/2.0

UsrInletEpsilon = 0.085*UsrDensity*UsrInletK^2/ 10*UsrDynamicViscosity)

I hope this is useful.

James

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