Question

The k-ε model focuses on the mechanism which affects ____________

(a) the Reynolds stresses

(b) the cross stresses

(c) the transport of scalar fluxes

(d) the turbulent kinetic energy

I have been asked this question in an interview for internship.

This is a very interesting question from Turbulence Modelling topic in portion Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Correct choice is (d) the turbulent kinetic energy

To explain I would say: The basic mixing length model cannot define a flow which involves flow separation or recirculation. So, a better turbulence model is developed in terms of k and ε. This model focuses on the dynamics of the flow and hence its turbulent kinetic energy.