By | Peter Vorobieff | |
From | Department of Mechanical Engineering University of New Mexico |
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When | May 1, 2006 1:00 pm |
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Where | Room 202, Weber Building | |
Abstract | In many high-speed compressible mixing flows, the dominant flow structure manifests itself as a pair of counter-rotating vortex columns with species mixing in the flow being advected into the vortex cores and mixed. The flow pattern associated with this vortex pair often resembles a mushroom (hence the title of the talk). The primary instability leading to the formation of the vortex pair may vary from flow to flow, however, the secondary, smaller-scale instabilities largely responsible for the mixing are the same - driven by shear in the plane normal to the large-scale vortex cores, driven by the misalignment between pressure and density gradients in the same plane, or developing along the axis of the large-scale vortex. In this talk, we present experimental and numerical studies of several flows exhibiting similar behaviour, wherein mixing is driven by a pair of large-scale vortices and greatly enhanced by secondary flow instabilities. | |
Further Information | Vakhtang Putkaradze |