Some Finding of Drag Reduction of Bluff Bodies and its Relation to the Vortex Wake

DOI

Description

A hydrodynamical mechanism occuring in near wake behind bluff bodies is considered together with historical reveiw of the drag theory of bluff bodies. Further, pressure drag on the body and its reduction is investigated on the basis of computer simulation. Numerical simulations of uniform flow of a viscous fluid around a bluff body like a circular cylinder or a D-shaped cylinder have been carried out at the Reynolds number 104 under two-dimensional restiriction of the flow field. It is found that the drag on some cylindrical bodies such as the D-shape is lower than the drag on corresponding circular cylinder. Formation of vortex structure and subsequent vorticity dynamics in the wake have significant effect on the pressure drag. Experimental observations support this result.

Journal

Details 詳細情報について

  • CRID
    1390001204207933952
  • NII Article ID
    130004809760
  • DOI
    10.11345/nctam.50.11
  • ISSN
    13494236
    02856042
  • Text Lang
    en
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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