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Gamma ReTheta Transition Model

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Old   January 7, 2012, 03:41
Default Gamma ReTheta Transition Model
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Jyothiprakash
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hi..i am fresher for CFD..what is the solution for error..Gamma ReTheta Transition Model must have valid field function set for free stream edge definition..
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Old   January 10, 2012, 13:25
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Joshua Counsil
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You must define the freestream edge so that the freestream momentum thickness Reynolds number can be transported into the boundary layer.

Create a field function (Tools > Field Function).

Define the field function. The Help file of CCM+ uses this as an example:$WallDistance > 0.005?1:0
(if the wall distance is larger than 5 mm, then that is the freestream; otherwise, it's the boundary layer).


In Continua > Physics > Models > Gamma ReTheta, set the Free Stream Edge to your user-defined field function.
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Old   April 13, 2018, 17:30
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Suraj Pawar
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I am using StarCCM+ to model open water performance of the propeller. I know how to set the field function for freestream edge. But, I do not know how can we calculate the wall distance correctly for freestream edge definition. Also, what is the significance of this freestrream edge? Does StarCCM+ uses different turbulent model equations within the boundary layer and in free stream?
Thank You.
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