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LARGE EDDY SIMULATION OF OBLIQUE FLOW PAST A CUBICLE OBSTACLE

Demetri G. Bouris
Department of Engineering and Management of Energy Resources University of Western Macedonia Kastorias & Fleming 1, 50100, Kozani, Greece

Andreas P. Theodorakakos
Fluid Research Co, 49 Laskareos Str, 114 72, Athens

George C. Bergeles
Department of Mechanical Engineering, National Technical University of Athens, 5 Heroon Polytechniou, 15710 Zografos- Athens, Greece

Resumo

Oblique flow past a cube or low rise structure is of importance in designing and constructing structures and buildings, among other applications. In the present study the large eddy simulation (LES) methodology is applied on an unstructured grid with locally refined resolution in order to study the surface pressure field and the conical vortices that develop on the roof of a low rise cubicle. Three simulations are performed, evaluating the effect of temporal and spatial resolution and results are compared to experimental measurements and to a point vortex theory for the conical vortex structure. Spatial resolution is found to be of importance in correct representation of the conical vortex structure as well as the high frequency spectrum of the roof-top pressure fluctuations.