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The first wall damping function in the Spalart-Allmaras model is a function of ___________

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in Computational Fluid Dynamics by (117k points)
The first wall damping function in the Spalart-Allmaras model is a function of ___________

(a) the product of the dynamic eddy viscosity parameter and the dynamic eddy viscosity

(b) the ratio of the dynamic eddy viscosity parameter and the dynamic eddy viscosity

(c) the product of the kinematic eddy viscosity parameter and the kinematic eddy viscosity

(d) the ratio of the kinematic eddy viscosity parameter and the kinematic eddy viscosity

I have been asked this question during an online exam.

The query is from Turbulence Modelling in division Turbulence Modelling of Computational Fluid Dynamics

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Correct option is (d) the ratio of the kinematic eddy viscosity parameter and the kinematic eddy viscosity

The explanation is: The first wall damping function is introduced in the dynamic eddy viscosity. The dynamic eddy viscosity divided by the density of the flow is the kinematic viscosity. So, the function is a function of the ratio of the kinematic eddy viscosity parameter and the kinematic eddy viscosity.

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