Question

The non-linear k-ε models relate the Reynolds stresses to _________

(a) the cubic vector products of strain rate and vorticity

(b) the quadratic vector products of strain rate and vorticity

(c) the cubic tensor products of strain rate and vorticity

(d) the quadratic tensor products of strain rate and vorticity

This question was posed to me in class test.

I'm obligated to ask this question of Turbulence Modelling topic in section Turbulence Modelling of Computational Fluid Dynamics

Answer 1

The correct answer is (d) the quadratic tensor products of strain rate and vorticity

For explanation I would say: The Reynolds stresses in the non-linear k-ε models relate the Reynolds stresses to the quadratic product of local vorticity and strain rates. These two quantities are tensors. The method sensitizes the Reynolds stresses.