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Turbulence Heat and Mass Transfer 5. Proceedings of the International Symposium on Turbulence Heat and Mass Transfer
September, 25-29, 2006, Dubrovnik, Croatia

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf


ISBN Print: 978-1-56700-229-4

ISSN: 2377-2816

Spatio-Temporal Evolution of Large-Scale Vortices in Turbulent Flow Around a Wall-Mounted Cube

pages 449-452
DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.910
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RÉSUMÉ

Flow around a wall-mounted cube is an example of turbulent flows around a three-dimensional bluff body attached to a surface. The main experimentally observed feature of such flows is the appearance of complex vortical structures, e.g., a horseshoe vortex, originating in front of a body and enveloping it. The current paper is a follow-up of [1] where results of direct numerical simulation (DNS) of turbulent flow around a cube were presented. It is shown that unsteadiness of the considered flow is caused by inviscid-viscous interaction between the horseshoe vortex and the narrow band of positive vorticity attached to the surface in front of the cube. Details on spatio-temporal evolution of large-scale vortical structures, including samples of long-term visualization and turbulence statistics, are presented. For the normal-to-the-wall velocity, in the vicinity of the cube's front face, the results revealed anomalous probability distribution, viz., bimodal and with high Kurtosis.

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