Accession Number:

ADA094085

Title:

Use of Strained Coordinate Perturbation Method in Transonic Aeroelastic Computations.

Descriptive Note:

Final rept. Nov 79-Jun 80,

Corporate Author:

PURDUE UNIV LAFAYETTE IND SCHOOL OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s):

Report Date:

1980-10-01

Pagination or Media Count:

47.0

Abstract:

The application of the strained coordinate perturbation method in transonic aeroelastic computations is investigated. The main objective is to reduce the computational time required for transonic aeroelastic calculations. Based on the strained coordinate perturbation equations, a procedure is presented to generate steady state initial conditions for LTRAN2 transonic code. Influence of such initial conditions on unsteady computations is studied. Results are illustrated for Mach number, angle of attack and thickness variations. The computer time required by the present procedure and the direct LTRAN2 computations are compared. There is a considerable saving in the computer time by present procedure. The application of the strained coordinate perturbation method in computing transonic divergence speeds of a slender straight wing is presented. Results are obtained for a 10 thick parabolic arc at varying Mach number. Transonic divergence speeds obtained by present method are compared with those given by subsonic theory. A computer program for creating the steady state initial conditions based on the strained coordinate perturbation method is presented. This program is compatible with LTRAN2. Author

Subject Categories:

  • Numerical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE