Department of Physics, Engineering Physics & Astronomy

Queen's University
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Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Eddy-Resolving Simulations: a Tool in Turbulence Research

Ugo Piomelli
Department of Mechanical and Materials Engineering, Queen's University

Friday, September 21, 2012
1:30 PM @ Stirling A

Abstract:

Turbulence is present in most flows of interest in aerospace, naval, civil and environmental engineering, as well as in meteorology, oceanography and other disciplines in the physical sciences. The accurate prediction of its effects is critical for the design and analysis of ship, cars and aircraft, for weather prediction, and in many other applications. Perhaps the most important physical feature of turbulence is the presence of coherent vortical motions, known as "eddies". The eddies govern the mixing of mass, momentum and energy in turbulent flows. Calculating the dynamics of these eddies by solving directly the equations of motion (the Navier-Stokes equations) is the most exact way to compute turbulent flows; in engineering applications, however, the computational effort entailed by such calculations is excessive, and simplified methods must be used. Recently, alternative methods have been developed that resolve the most dynamically important eddies while modelling the smaller ones. With the decreasing cost of computational power, these techniques are being increasingly used in industrial applications, at the same time as their further development and refinement is being carried out in the research and academic environments. In this seminar typical applications of these techniques will be reviewed, with examples drawn from the research work carried out in the Turbulence Simulation and Modelling Laboratory at Queen's University.