Multiple source modeling of low-Reynolds-number dissipation rate equation with aids of DNS data

The paper reports a multiple source modeling of low-Reynolds-number dissipa tion rate equation with aids of DNS data. The key features of the model are to satisfy the wall limiting conditions of the individual source terms in the exact dissipation rate equation using the wall damping functions. The w all damping functions are formulated in term of dimensionless dissipation l ength scale l(D)(+)(') (=l(D) (V epsilon)(1/4)/v) and the invariants of sma ll and large scale turbulence anisotropy tensors, a(ij)(=(u(i)u(j)) over ba r /k-2 delta (ij)/3) and e(ij)(=epsilon (ij)/epsilon -2 delta (ij)/3). The model constants are optimized with aids of DNS data in a plane channel flow . Adopting the dissipation length scale as a parameter of damping function, the applicabilities of h-e model are extended to the turbulent Row calcula tion of complex flow passages.