ON THE LARGE-EDDY SIMULATION OF A TURBULENT CHANNEL FLOW WITH SIGNIFICANT HEAT-TRANSFER

A large eddy simulation of a planar channel flow with significant heat transfer at a low Mach number was performed to study effects of fluid property variations on the near-wall turbulence structure. A compress ible dynamic subgrid scale model was used to model the residual-scale turbulence. Two low Reynolds number channel hows with one wall heated and one wall cooled at temperature ratios of 1.02 and 3.0 were simulat ed to study the effects of property variations at low Mach number. Sev eral features of the flow were observed to vary with the heat transfer level including velocity and temperature rms values. Specifically, th e temperature velocity correlations were found to exhibit stronger dep endency on heat transfer rate. At the higher heat transfer rate, densi ty fluctuations at levels characteristic of Bows at much higher Mach n umbers were observed. Heating appeared to enhance velocity fluctuation s whereas density and temperature percentage fluctuations were greates t near the cooled wall when scaled by their local mean values. (C) 199 6 American Institute of Physics.