FINITE DIFFERENCE ANALYSIS OF UNSTEADY CAVITATION ON A TWO- DIMENSIONAL HYDROFOIL

The authors present a new cavity model, named Bubble Two-phase Flow (BTF), to explain the interaction between viscous fluid and bubble dynamics. This BTF cavity model treats the inside and outside of a cavity as one continuum by regarding the cavity as a compressible viscous fluid with varied density. Navier-Stokes equations, including cavitation bubble clusters, are solved in finite difference form by a time-marching scheme. The growth and collapse of a bubble cluster is given by a modified Rayleigh's equation. Computations are shown for a two-dimensional flow field around a hydrofoil NACA0015 at an angle of attack of 8.0 degrees with a Reynolds number of 3 x 10 to the fifth power. The results show the occurrence of the attached cavity at the foil leading edge, and can predict the generation of cavitation clouds with large-scale vortices. This newly proposed BTF cavity model is expected to be a flexible and promising approach to the analysis of unsteady cavitation.

Media Info

  • Features: References;
  • Pagination: 17p., incl. discuss.

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Filing Info

  • Accession Number: 00661102
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM