Gamma ReTheta Transition Model

arkadu · January 7, 2012, 03:41

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..

Josh · January 10, 2012, 13:25

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.

surajp92 · April 13, 2018, 17:30

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.

January 7, 2012, 03:41	Gamma ReTheta Transition Model	#1
arkadu New Member Jyothiprakash Join Date: Jan 2012 Posts: 3 Rep Power: 13	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..

January 10, 2012, 13:25		#2
Josh Senior Member Joshua Counsil Join Date: Jul 2009 Location: Halifax, Nova Scotia, Canada Posts: 366 Rep Power: 16	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. mb.pejvak, arkadu, sadjad.s and 1 others like this.

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April 13, 2018, 17:30		#3
surajp92 New Member Suraj Pawar Join Date: Feb 2017 Posts: 16 Rep Power: 8	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.