Question

The term representing the effect of small-scale eddies in diffusion terms of the k transport equation and ε transport equations take the values ___________ and ____________

(a) 1.49, 1.49

(b) 1.39, 1.39

(c) 1.39, 1.49

(d) 1.49, 1.39

This question was addressed to me in an international level competition.

I'd like to ask this question from Turbulence Modelling in chapter Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Right choice is (b) 1.39, 1.39

To explain: The terms mentioned in the question are αk and αε. These terms take the same value for the RNG k-ε model. The values are 1.39 both. These are obtained from the experimental data.