Modélisation du Transfert Thermique Turbulent Traversant des Canaux

Abstract

In this work we present the numerical simulations of a turbulent forced convection in wavy channel with small amplitude. The prediction of the dynamic and the thermal fields is done by three turbulence models ( , RNG and RSM) which are implanted in the commercial code FLUENT 6.2.16. The governing equations are solved by the finite volume method and by using the SIMPLE algorithm.

The dynamical validation is made against the results of the direct numerical simulation (DNS) of Maaß and Schumann. The predicted velocity profiles depend on the near wall mesh. The results obtained show that the three models predict satisfactory the velocity profile. This one is very close to the velocity profile the DNS. As the RSM models adequately the anisotropy of the turbulence gives a good representation of the Reynolds stresses, in the other hand, requires huge memory and large time of computation.

The thermal results obtained by the model (which is better for predicting the thermal field according to Jones et al 1972; Patel et al 1985), showed that the use of the undulations has a large influence on the heat transfer compared to the case of plane wall. The heat transfer increases when the amplitude of wave increases. In the same way the heat transfer increases when the Reynolds number increases.