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Boundary conditions near the solid-walls for a k-ε model depends on ___________

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Boundary conditions near the solid-walls for a k-ε model depends on ___________

(a) Eddy viscosity

(b) Reynolds number

(c) ε-value

(d) k-value

The question was asked in class test.

Query is from Turbulence Modelling topic in section Turbulence Modelling of Computational Fluid Dynamics

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The correct answer is (b) Reynolds number

The explanation: The behaviour of the boundary conditions depends on the Reynolds number. Near the wall, the k-ε model does not perform well. So, wall functions are used. This again depends on the Reynolds number of the flow only.

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