Question

____________ and _____________ are used in the k-ε model in addition to k and ε to formulate the transport equations.

(a) Internal thermal energy and turbulent stresses

(b) Internal thermal energy and kinetic energy

(c) Rate of deformation and turbulent stresses

(d) Rate of deformation and kinetic energy

This question was posed to me in my homework.

My question is based upon Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics

Answer 1

Right option is (c) Rate of deformation and turbulent stresses

Explanation: While forming the transport equations for k and ε, the rate of deformation term and the turbulent stresses are also used. These are used in their tensor form. Both of them can be expressed in terms of the mean velocity gradients.