variavel0=<b>JOSÉ LUIZ ALVES DA FONTOURA RODRIGUES</b> - fontoura@unb.br UNB
<b>Carlos Henrique Ribeiro Lima</b> - chrlima@yahoo.de UNB
<b>Abstract.</b> This work presents a comparative analysis of performance, between five models of turbulence, three of them with the first order closure of Boussinesq, 1877, and the others derivate of the second order closure proposed by Gatski and Speziale, 1993. For each one of the Reynolds tensor representation in study, are analyzed models that are capable to simulate the interior of the turbulent boundary layer, with the wall law and with low-Reynolds turbulence. There have been tested the classical logarithm law and the low-Reynolds model of So et al., 1997. The test case adopted is the flow in a asymmetric diffuser of Buice and Eaton, 1997, proposed in the 8th ERCOFTAC, 1999, as experimental data base created for performance analysis of wall-bounded numerical models of turbulence. The numerical discretization is done by a finite volume colocated arrangement for pressure and velocity, complemented with the Rhie-Chow, 1983, interpolation for the mass flux. The results obtained shown the localization and the length of the recirculation region, the longitudinal profile of pressure coefficient over the down wall and the upper wall of the diffuser and the  average velocity transversal profiles in the pipe before the diffuser, in the diffuser and in the pipe after the diffuser.
<b>Keywords.</b> Wall-bounded turbulence, Second order closure, Asymmetric diffuser, Wall laws, Low Reynolds.