Large Eddy simulation and Reynolds-averaged Navier–Stokes modeling of flow in staggered plate arrays: Comparison at various flow regimes
Résumé
In this paper three flow-modeling strategies are employed to study the evolution of the threedimensional
turbulent flow characteristics and heat transfer mechanisms with the Reynolds number
in staggered plate arrays: steady RANS, steady laminar and the LES approach. In the RANS modeling
framework keε realizable, keu SST and RSM turbulence models are used. This paper also compares the
accuracy of RANS and laminar steady models with LES simulation for 300 < Re < 9000 which corresponds
to the Reynolds number range encountered in offset strip fins (OSF) heat exchangers. Analysis of
numerical results from global and local points of view shows great dispersion especially in the transitional
flow regime. Moreover the RANS turbulent model that produces the best predictions cannot be
known a priori.