# Use of Tu for user expression

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 August 7, 2006, 07:55 Use of Tu for user expression #1 Adam Guest   Posts: n/a Sponsored Links 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

 August 8, 2006, 03:21 Re: Use of Tu for user expression #2 James Date Guest   Posts: n/a 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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