SIMULATION OF AN IMPINGING JET ISSUED INTO A CROSS FLOW WITH RANS AND LES METHODS

Abstract

Simulation of the fluid flow and heat transfer of an impinging axi-symmetric jet exiting perpendicular into a cross flow is carried out. Basicly, two methods are employed to model the physics of turbulence: one is by solving the Reynolds averaged Navier Stokes equations (RANS); the other is by the large eddy simulation (LES). In the RANS method, a linear eddy viscosity model (AKN, Abe et al., 1994), an explicit algebraic stress model (EASM, Rokni 2000), and a V2F model Durbin (1995) are employed to close the time averaged momentum equations. The nozzle-to-wall distance (H) is kept at four nozzle diameters (D), while the span-wise width of the channel is 8D. Three ratios (M) of cross flow to jet velocity are considered (0, 0.1, 0.2) for a jet Reynolds number (Rej) of 20,000. The field data from the RANS and LES methods are compared in detail. In addition, both the calculated heat transfer and fluid flow data are compared with available experimental data.