Bluff-body drag reduction by passive ventilation | Zendy

G. K. Suryanarayana | Zendy; Henning Pauer | Zendy; G. E. A. Meier | Zendy

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Bluff-body drag reduction by passive ventilation

Author(s) -

G. K. Suryanarayana,

Henning Pauer,

G. E. A. Meier

Publication year - 1993

Publication title -

experiments in fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.01

H-Index - 122

eISSN - 1432-1114

pISSN - 0723-4864

DOI - 10.1007/bf00944909

Subject(s) - drag , mechanics , boundary layer , wake , streamlines, streaklines, and pathlines , flow separation , aerodynamic drag , stagnation point , vortex shedding , turbulence , materials science , physics , reynolds number , heat transfer

The drag of a sphere at highRe can be reduced to more than half its value by passive ventilation from the stagnation region to the base. Simultaneously, the flow field around the base is stabilized and made symmetric, leading to reduction of unsteady aerodynamic forces. At highRe, the vent flow breaks through the dead water region associated with the near wake and aerodynamically streamlines the base. The streamlining is done by virtue of a base-vortex-ring beyond the point of turbulent boundary layer separation. A mean flow model for the flow around the vented sphere is proposed.

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