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Help regarding field functions in star CCM+

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Old   December 11, 2022, 05:30
Default Help regarding field functions in star CCM+
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Danmark
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Hi,
Firstly I'm new to Star CCM+ and CFD simulations in general. Now to the question.

I'm currently trying to plot the turbulent boundary layer profile as a function of the wall y+ value. The general thought is to illustrate the relevance of high y+ wall treatment for coarse meshes and low y+ wall treatment for fine meshes. However, when I try to create a field function reflecting the turbulent boundary layer velocity given by the formula "u_tau = sqrt(tau_w / rho)", then I get the following message of error:

Error: function 'Simulation>FieldFunctionManager>UserFieldFunction ("TurbBoundaryLayer_Velocity")' compilation error: syntax error
Unable to compile expression "mag($${Velocity})/(sqrt(mag($${WallShearStress})/${Density})"

I think the problem might be an incorrect use of the "mag" tool, but maybe one smarter than me knows how correct this.

Thank you for your attention.
Rasmus.
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Old   May 15, 2023, 05:13
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TheIndianLel
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Hello!

I don't know if you are still looking for an answer but you are missing a closing bracket in the denominator.
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field functions, turbulent boundary layer, velocity, wall treatment

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