Topology and dynamics of the A-pillar vortex | Zendy

Benjamin Lévy | Zendy; Pierre Brancher | Zendy

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Topology and dynamics of the A-pillar vortex

Author(s) -

Benjamin Lévy,

Pierre Brancher

Publication year - 2013

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.188

H-Index - 180

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.4792710

Subject(s) - physics , vortex , vorticity , particle image velocimetry , flow (mathematics) , kinetic energy , mechanics , displacement (psychology) , classical mechanics , topology (electrical circuits) , geometry , turbulence , psychology , psychotherapist , mathematics , combinatorics

International audienceThe topology and dynamics of the flow bypassing an automobile A-pillar modeled by a 30° dihedron are investigated experimentally. The various components of the A-pillar flow are identified by means of low and high frequency particle image velocimetry. For each component, the time evolution of the position, displacement, vorticity magnitude, circulation, and fluctuating kinetic energy are analyzed along the A-pillar. More precisely, the flow by passing the A-pillar is composed of two vortex structures with different behaviors. The major structure grows in size, circulation magnitude, and total amount of fluctuating kinetic energy along the A-pillar, whereas the minor structure does not vary significantly. Finally, the displacement of the major structure is identified as a movement of precession and the influence of the A-pillar geometry is emphasized

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