Modeling 3D Unsteady Sheet Cavities Using a Coupled UnRANS-BEM Code

The flow field of a propeller blade subjected to sheet and cloud cavitation includes several complex and strongly interacting features: flow separation, turbulence, presence of vortical structures, deforming and moving free surfaces, free surface instability, and cavity break-up. To best describe this flow field the authors are developing a numerical scheme combining a viscous Navier Stokes code (UnRANS) and a potential code [boundary element method (BEM)], combining the capabilities of each model to address portions of the problem and to achieve a description level that is not possible with each of the methods alone. The UnRANS code is used to describe the turbulent viscous flow around the blade, while the BEM code is used to describe the non-linear cavity free surface deformations. In this paper the authors apply the developed method to study sheet cavitation dynamics on a straight and a twisted elliptical hydrofoil. They show the results obtained and discuss issues and future development efforts. Cases presented consider the influence of the cavitation number, the incidence angle, the oscillation of the foil, and the Reynolds number on the results. Also the influence on the cavity dynamics of a perturbation in the inflow field, such as in a wake, is considered.

• Record URL:
  • http://www.nap.edu/catalog.php?record_id=10189
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780309254670
• Corporate Authors:

  Office of Naval Research

  Department of the Navy, 800 North Quincy Street
  Arlington, VA  United States  22217

  Bassin d'Essais des Carenes

  Chaussee du Vexin
  Val-de-Reuil,   France  27100

  National Research Council

  Naval Studies Board, 500 5th Street, NW
  Washington, DC  United States  20001
• Authors:
  • Chahine, Georges L
  • Hsiao, Chao-Tsung
• Discussers:
  • Song, C
• Conference:
  • Twenty-Third Symposium on Naval Hydrodynamics
  • Location: Val de Reuil , France
  • Date: 2000-9-17 to 2000-9-22
• Publication Date: 2001

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: pp 670-686
• Monograph Title: Twenty-Third Symposium on Naval Hydrodynamics

Subject/Index Terms

• TRT Terms: Angle of incidence; Boundary element method; Cavitation (Mechanics); Flow fields; Hydrofoils; Oscillation; Propeller blades; Reynolds number; Turbulence; Wakes
• Uncontrolled Terms: Navier Stokes equations
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 01369740
• Record Type: Publication
• ISBN: 9780309254670
• Files: TRIS
• Created Date: May 11 2012 9:05AM