Environmental Risk Assessment and Remediation

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Environmental Risk Assessment and Remediation 44 7897 074717

Vortex Breakdown New Open Access Journals

Vortex breakdown was first recognized in the aerodynamic context of flow over a  highly swept wing  (such as a  delta wing)  at a high angle of attack. Photographic evidence display that the bubble type of breakdown is dominant in trailing vortices while both forms occur in leading-edge vortices over delta wings. Within the disruption structure, the vortex is lame in the sense that the velocity gradients are smaller since the circulation is redistributed over a larger area. Although this does not imply decay of vorticity in itself, the vortex does decay rather rapidly downstream of a breakdown in both types since the flow almost always becomes turbulent. It was also observed that the bubble dune was nearly axisymmetric and the flow downstream of the bubble nearly resembled C parallel flow upstream.

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