Accession Number : AD0664262

Title :   SECOND-ORDER THEORY FOR FLOW PAST OSCILLATING FOILS.

Descriptive Note : Technical rept.,

Corporate Author : RUTGERS - THE STATE UNIV NEW BRUNSWICK N J DEPT OF MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Chen,Chuan F. ; Wirtz,Richard A.

Report Date : AUG 1967

Pagination or Media Count : 45

Abstract : A second-order theory for the lifting problem was developed for foils performing harmonic oscillations either in plunging or pitching modes. The second-order problem is obtained by systematic expansions of the variables involved. By a suitable definition of the second-order acceleration potential, the second-order problem is reduced to a form similar to that of the first-order problem. The method used for the first-order problem was applied for the solution of the second-order problem with some modifications. Numerical results were obtained for a symmetric Joukowsky foil oscillating in plunging or pitching mode. These results are compared with existing results on the effect of finite thickness of the foil, and to some recent results obtained by numerically solving the full nonlinear problem. (Author)

Descriptors :   (*HYDROFOILS, TWO DIMENSIONAL FLOW), OSCILLATION, PITCH(MOTION), HYDROFOIL CRAFT, WAKE, PERTURBATION THEORY, THICKNESS, NUMERICAL ANALYSIS, LIFT, HARMONIC GENERATORS, MATHEMATICAL PREDICTION, OSCILLATION

Subject Categories : Marine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE