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A limiter is imposed on _________ to improve the performance in adverse pressure gradients and wake regions.

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A limiter is imposed on _________ to improve the performance in adverse pressure gradients and wake regions.

(a) the Reynolds number

(b) the eddy viscosity

(c) the k-value

(d) the ε-value

This question was posed to me during an internship interview.

Question is from Turbulence Modelling in portion Turbulence Modelling of Computational Fluid Dynamics

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Correct choice is (b) the eddy viscosity

To explain I would say: There are two limiters used in the Shear Stress Transport model. One of these is on the eddy viscosity. This is done to improve the performance of the model when there are adverse pressure gradients or with wakes. These are the places where the k-ε model fails.

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