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LARGE-EDDY SIMULATION OF SCALAR DISPERSION FROM A POINT SOURCE OVER A WAVY WALL

David A. Philips
Center for Turbulence Research, Department of Mechanical Engineering, Stanford University Stanford CA 94305, USA

Riccardo Rossi
Laboratorio di Termofluidodinamica Computazionale,Seconda Facoltá di Ingegneria di Forli, Universitá di Bologna, Forli, Italy; and Center for Turbulence Research, Department of Mechanical Engineering, Stanford University, USA

Gianluca Iaccarino
Department of Mechanical Engineering Institute for Computational Mathematical Engineering Stanford University Bldg 500, RM 500-I, Stanford CA 94305 - USA

Аннотация

A Large-Eddy Simulation (LES) of scalar dispersion over a wavy wall has been performed and is compared with Direct Numerical Simulation (DNS) data for the same case. LES statistics show excellent agreement with DNS data at a much lower computational cost. The LES mesh cell count has been reduced by a factor of eight and the timestep doubled as compared to the DNS calculation. Mean flow and Reynolds stress data is presented along with mean scalar and scalar flux statistics. Barycentric maps are used to visualize the state of turbulence in the flow field captured by LES while scatter plots of mean scalar concentration give an overall picture of predictive performance. For both of the prior analysis techniques, RANS results are included in the discussion to place the LES results in appropriate context in terms of computational expense and accuracy.