A MODEL OF STRESS DISSIPATION IN 2ND-MOMENT CLOSURES

The paper presents a modified expression for the dissipation rate tensor epsilon(ij) in the second-moment closure models, which employs the dissipation ''flatness'' parameter E and the turbulence Re number. The expression reproduced the distribution among the three diagonal components of epsilon(ij) in agreement with the direct numerical simulation of a plane channel flow of Mansour, Kim and Moin, 1988. Implemented in a low-Re-number differential Re-stress model the relationship yielded predictions of dissipative components better than other models, albeit spoiled by still unsatisfactory modelling of the equation for the energy dissipation rate epsilon.