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ISSN オンライン: 2642-0554

MERGING AND AUTO-GENERATION OF VORTICES IN WALL BOUNDED FLOWS

M.V. Goudar
Laboratory for Aero & Hydrodynamics Delft University of Technology Leeghwaterstraat 21, 2628CA Delft, The Netherlands

Wim-Paul Breugem
Laboratory for Aero- and Hydrodynamics, Department of Mechanical Engineering, Delft University of Technology, Leeghwaterstraat 21, 2628CA Delft, The Netherlands

Gerrit E. Elsinga
Laboratory for Aero and Hydrodynamics Delft University of Technology Leeghwaterstraat 21, 2628CA Delft, The Netherlands

要約

For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the interaction of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial streamwise spacing between them. The numerical procedure followed is similar to Zhou et al. (1999). The two eddies were found to merge into a single stronger eddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial streamwise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies.