A MODEL OF STRESS DISSIPATION IN 2ND-MOMENT CLOSURES

The paper presents a modified expression for the dissipation rate tens or 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 compo nents of epsilon(ij) in agreement with the direct numerical simulation of a plane channel flow of Mansour, Kim and Moin, 1988. Implemented i n a low-Re-number differential Re-stress model the relationship yielde d predictions of dissipative components better than other models, albe it spoiled by still unsatisfactory modelling of the equation for the e nergy dissipation rate epsilon.