Accession Number : ADP007798

Title :   A Time Linearization Approach for Unsteady Transonic Flows,

Corporate Author : ALBERTA UNIV EDMONTON DEPT OF MATHEMATICS

Personal Author(s) : Wong, Y. S. ; Lee, B. H. K. ; Murty, H. S.

Report Date : MAR 1992

Pagination or Media Count : 22

Abstract : In this paper, development of a time-linearization approach for solving the unsteady transonic small disturbance equation is described in UST3D simulation code (UnSteady Transonic code for a 3D isolated wing). The accuracy of the method was examined by comparing the unsteady pressure distributions with those obtained from XTRAN3S code and experiments carried out at NLR on the F-5 wing at subsonic and transonic speeds. Some comparisons were also made for thicker wings (ONERA M6 and LANN) to show the deficiencies of the method. Using the UST3D code, flutter analysis was carried out on the AGARD 445.6 wing. The flutter boundaries were compared with experimental results and those from CAP-TSD code.

Descriptors :   *FLUTTER, *WINGS, *TRANSONIC CHARACTERISTICS, *UNSTEADY FLOW, ACCURACY, APPROACH, BOUNDARIES, COMPARISON, DEFICIENCIES, EQUATIONS, PRESSURE, TIME, VELOCITY, CANADA, COMPUTERIZED SIMULATION.

Subject Categories : Fluid Mechanics
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE