A NONLINEAR METHOD FOR PREDICTING UNSTEADY SHEET CAVITATION ON MARINE PROPELLERS

A method is presented which provides a basis for predicting the non-linear dynamic behaviour of unsteady propeller sheet cavitation. The method separates the fluid velocity potential boundary-value problem into two parts, static and dynamic, which are solved sequentially in a forward time stepping procedure. The static potential problem is for the cavity fixed instantaneously relative to the propeller and the propeller translating through the non-uniform wake field. This problem can be solved by standard methods. The dynamic potential represents the instantaneous reaction of the cavity to the static potential field and thus predicts the cavity's deformation and motion relative to the blade. A solution is obtained for the dynamic potential by using the concepts of slender-body theory to define near- and far-field potentials which are matched to form the complete solution. The theory is presented for the general foil and not specifically for propellers. However, the method incorporates features in its formulation which facilitate its application to marine propellers.

• Supplemental Notes:
  • J. Ship Res., 27 <1983>, p.56 <Mar.> (19 pp., 17 ref., 5 graphs, 10 diag.)
• Authors:
  • Stern, F
  • Vorus, W S
• Publication Date: 1983

Language

• English

Subject/Index Terms

• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00684850
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM