Question

The dynamic eddy viscosity used in the RNG k-ε model is ____________

(a) half of the that of the k-ε model

(b) the same as that of the k-ε model

(c) twice that of the k-ε model

(d) thrice that of the k-ε model

The question was asked in an online interview.

This intriguing question comes from Turbulence Modelling in division Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Correct choice is (b) the same as that of the k-ε model

The explanation is: The dynamic eddy viscosity used in the RNG k-ε model is the same as that of the k-ε model. The equation used is

μt=ρCμ\(\frac{k^2}{\varepsilon}\).