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Topological evolution of laminar juncture flows under different critical parameters

Science China(Technological Sciences) 2014年第7期57卷 1342-1351页

作者： YOUNIS Muhammad Yamin ZHANG Hua HU Bo MEHMOOD Saqib National Key Laboratory of Fluid Mechanics School of Aeronautical Science and Engineering Beihang University School of Astronautics Beihang University

Horseshoe vortex topological structure has been studied extensively in the past,traditional"saddle of separation"and new"attachment saddle point"topologies found in literature both have theoretical basis and experimental and computational evidences for *** laminar incompressible juncture flows at low Reynolds numbers especially are observed to have new *** concerning the existence of the new topology though found in literature,the topological evolution and its dependency on various critical flow parameters require further investigation.A Particle Image Velocimetry based analysis is carried out to observe the effect of aspect ratio,?*/D and shape of the obstacle on laminar horseshoe vortex topology for small *** in aspect ratio evolves the topology from the traditional to new for all the cases *** circular cross section obstacles are found more apt to having the new topology compared to square cross *** is noted that the sweeping effect of the fluid above the vortex system in which horseshoe vortex is immersed plays a critical role in this *** evolution is observed not only in the most upstream singular point region of horseshoe vortex system but also in the corner *** corner vortex topology evolves from the traditional type to new one before the topological evolution of the most upstream singular point,resulting in a new topological pattern of the laminar juncture flows"separation-attachment combination".The study may help extend the understanding of the three-dimensional boundary layer separation phenomenon.

关键词： horseshoe vortex saddle of attachment saddle of separation topological evolution sweeping effect

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