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Results On Large Eddy Simulations Of Some Environmental Flows


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V. Armenio & S. Salon


Results on large eddy simulations of some environmental flows V. Armenio1 & S. Salon2 1Dipartimento di Ingegneria Civile e Ambientale, Universit√° di Trieste, Italy. 2Istituto Nazionale di Oceanografia e Geofisica Sperimentale - OGS, Sgonico (TS), Italy. Abstract In the present paper a synthesis of the scientific activity of the group of Environmental Hydraulics of the Universit√° di Trieste is given. Numerical simulations of flow fields of interest in Environmental engineering are presented and discussed. The simulations were carried out using Large-eddy simulation that is nowadays considered as a formidable tool for the detailed investigation of turbulence. The model employed in the simulation is briefly described. The results are shown for the following classes of problems: turbulent field over a topography; turbulent stratified wall-bounded flows; unsteady wall-bounded flows; particle dispersion in turbulent flows. 1 Introduction Numerical simulations represent nowadays a well-established tool for investigating turbulence. Turbulence research spans from civil engineering to geophysics, from industrial applications to fundamental studies, and the need to model turbulent flows is by now a meeting point for many researchers coming from different backgrounds. Numerical techniques can be generally divided in three kinds of approaches: Reynolds-averaged Navier-Stokes equations (RANS), large-eddy simulation (LES) and direct numerical simulation (DNS). The differences among these methods are substantially due to the averaging treatment adopted in the resolution of the primitive equations: RANS gives an estimate of the mean fields (velocity and density) and