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

Rongguang Jia
Division of Heat Transfer, Lund Institute of Technology, P.O. Box-118, 22100 Lund, Sweden

Johan Revstedt
Division of Fluid Mechanics, Lund Institute of Technology P.O. Box 118, S-221 00 Lund, Sweden

Rong Ding
Department of Heat and Power Engineering, Lund Institute of Technology P.O. Box-1I8, Lund 22100, Sweden

Masoud Rokni
Division of Heat Transfer, Lund Institute of Technology, P.O. Box-118, 22100 Lund, Sweden

Bengt Sunden
Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100, Lund, Sweden

Laszlo Fuchs
Department of Mechanics, KTH, CICERO, SE-10044 Stockholm; Division of Fluid Mechanics Lund University Lund, 22363, Sweden

Resumo

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.