Title: Assessment of the vortex method for Large Eddy Simulation inlet conditions

Authors: Fabrice Mathey, Davor Cokljat, Jean Pierre Bertoglio, Emmanuel Sergent

Addresses: Fluent France, 1 place Charles de Gaulle, 78180 Montigny Le Bretonneux, France. ' Fluent Europe Ltd., Sheffield Airport Business Park, Europa Link, Sheffield S9 1XU, UK. ' Ecole Centrale de Lyon LMFA, UMR 5509 CNRS, Ecole Centrale de Lyon, Av. G. de Collongue, 69130 Ecully, France. ' Ecole Centrale de Lyon, LMFA, UMR 5509 CNRS, Ecole Centrale de Lyon, Av. G. de Collongue, 69130 Ecully, France

Abstract: The Vortex Method (VM) based boundary condition of Sergent (2002) was implemented in the general purpose CFD solver Fluent. It is shown that the VM offers a relatively inexpensive and accurate way to generate random fluctuations representing a turbulent flow field at the inlet. Since the generated velocity field is temporally and spatially correlated, it is a much more realistic representation of turbulence than the one obtained with a simple velocity distribution, using a random generator. Validations are reported for fully developed turbulent channel flow, pipe flow and separated hill flow.

Keywords: turbulence; inlet boundary conditions; vortex method; CFD; computational fluid dynamics; turbulent flows; large eddy simulations.

DOI: 10.1504/PCFD.2006.009483

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.1/2/3, pp.58 - 67

Published online: 05 Apr 2006 *

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