Accession Number : ADA114825

Title :   Development of Perturbation Procedures for Nonlinear Inviscid and Viscous Flows.

Descriptive Note : Annual rept. 1 Feb 81-31 Jan 82,

Corporate Author : NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA

Personal Author(s) : Nixon,David

PDF Url : ADA114825

Report Date : Feb 1982

Pagination or Media Count : 15

Abstract : Certain topics on transonic flow theory and on numerical truncation errors have been investigated. In transonic flow theory the extension of the transonic perturbation method to include flows where shock waves vanish and the development of the technique to treat separated flows was undertaken with satisfactory results. Two other topics that were investigated concerned the application of perturbation theory to accelerate convergence of numerical solutions to predict potential flow. Finally, for transonic flow, the development of a 'potential-like' theory to more closely approximate the Euler equations was undertaken. A non-linear truncation error analysis was performed on certain Euler equation algorithms to develop corrections for the solution. An outcome of this work was the derivation of a criteria for use in adaptive mesh techniques. (Author)

Descriptors :   *Viscous flow, *Inviscid flow, *Numerical analysis, *Algorithms, Differential equations, Nonlinear analysis, Equations, Error analysis, Perturbations, Flow separation, Transonic flow, Shock waves, Theory

Subject Categories : Theoretical Mathematics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE