LARGE EDDY SIMULATION OF A TURBULENT CHANNEL FLOW WITH A PERIODIC PRESSURE-GRADIENT

A turbulent flow in a two-dimensional channel with fluid injection from one wall has been numerically simulated by large eddy simulation (LES). The Reynolds number based on the channel width and bulk velocity is 4 900. The total grid number used in the calculation is about 1.23 million, which allowed a highly resolved turbulent flow simulation. In the flow field, events of production, redistribution and dissipation of turbulent energy are observed in streamwisely separated locations. Therefore the LES data are instrumental in understanding the turbulence structure as well as in investigating turbulence models. The present result shows that the pressure-strain terms in Reynolds stress equations are related to the streamwise vortices with intensified pressure fluctuation, rather than to the direct isotropization.