Question

Which of these conditions define realizability?

(a) Negative k and ε values

(b) Linear k and ε transport equations

(c) Non-negative k and ε values

(d) Non-linear k and ε transport equations

I got this question during an online interview.

I need to ask this question from Turbulence Modelling topic in section Turbulence Modelling of Computational Fluid Dynamics

Answer 1

The correct answer is (c) Non-negative k and ε values

The best explanation: The values of turbulence quantities such as the turbulent kinetic energy (k) and the rate of dissipation of the turbulent kinetic energy (ε) cannot be negative and must always be constrained to have values above zero.