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Second Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2001, KTH, Stockholm, Sweden

DOI: 10.1615/TSFP2

LARGE EDDY SIMULATION OF THE TURBULENT FLOW PAST A BACKWARD FACING STEP WITH HEAT TRANSFER AND PROPERTY VARIATIONS

pages 241-246
DOI: 10.1615/TSFP2.400
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SINOPSIS

The effects of heat transfer and property variations on the turbulent flow past a backward facing step are investigated using large eddy simulation. Heat transfer is achieved through a constant heat flux boundary condition downstream of the step. Upstream of the step, the flow is fully developed. The Reynolds number based on the step height and upstream centerline velocity is 5540 and the expansion ratio is 1.5. Prior to carrying out the simulations with heat transfer, an isothermal flow simulation was conducted and results show good agreement with the particle tracking velocimetry experiments of Kasagi and Matsunaga. A robust collocated grid finite volume scheme using central differences and a nonlinear filter to suppress numerical oscillations has been developed. A fully coupled compressible formulation employing low Mach number preconditioning is adopted for the simulations conducted on the CRAY T-90. A dynamic subgrid scale procedure applied to the compressible version of the Smagorinsky model has been used to capture the effects of the small scales.

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