要約

We performed a comparative a priori examination of several algebraic and differential second-moment closure models (ASM and DSM) using the DNS database for three generic flows: fully developed channel flow (Moser et al., 1999), flow in an axially rotating pipe (Eggels et al., 1994 and Orlandi and Ebstein, 1999) and the flow over a backward-facing step (Le et al., 1997). First, the coefficient functions G⁽ⁱ⁾ and the basis tensors in the algebraic expression for the Reynolds-stress tensor, as well as the stress components themselves, were evaluated and compared for several ASMs. Then, the model coefficients of the pressure-strain term in the DSM were deduced from the DNS database, and compared with different model proposals. Last, the term-by-term analysis of the pressure-strain and dissipation correlation for several DSMs were performed.