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ISSN オンライン: 2642-0554

LARGE-EDDY SIMULATION OF SCALAR MIXING IN THE TURBULENT WAKE OF A SQUARE CYLINDER

Guido Lodato
Department of Energy and Propulsion INSA- Rouen, UMR-CNRS-6614-CORIA, Campus du Madrillet, Avenue de I'Universite, BP 8 76801 Saint Etienne du Rouvray Cedex, France

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

要約

Numerical experiments by Large-Eddy Simulation (LES) are performed on the turbulent flow and mixing of a passive scalar past a square cylinder. A Reynolds number of 21 400 is selected, matching available flow measurements from laser-doppler velocimetry (LDV), and the scalar released from a point source downstream of the cylinder. A comparative study of numerical results against LDV data is presented in order to validate the present LES methodology, where subgrid turbulent stresses are estimated via the WALE similarity mixed model coupled with newly developed constrained filtering operators of arbitrary order and scalar fluxes approximated via the Reynolds analogy. Time-averaged and phase-averaged statistics for the scalar field, including scalar variance and scalar flux components, are computed to examine further the role of coherent fluctuations associated with large-scale structures on the mixing process and to establish a database for turbulence models development and validation.