Accession Number:

ADA050323

Title:

Flow Field Matching.

Descriptive Note:

Final rept. May 76-Jan 78,

Corporate Author:

BOEING AEROSPACE CO SEATTLE WASH

Report Date:

1978-01-01

Pagination or Media Count:

26.0

Abstract:

In a transonic flow problem with subsonic freestream in an untransformed infinite flow field, the outer boundary conditions are hard to apply. By assuming that the flow outside an artificial matching boundary is subcritical and linear, a Prandtl-Glauert solution is used generated by panels of Greens function integrals along the matching boundary in the far field, while solving the near field by finite differences. The two solutions are joined iteratively by requiring continuity of potential and normal derivative across the matching boundary. Two refinements of this method are examined, also. In one, a locally linearized second-order far field solution a Poisson equation solution is used. In the second, a middle field inhabited by large rectangular finite elements is used in the area where the flow is highly nonlinear but still subcritical. This report details only the finite element results, the earlier ones having already been published.

Subject Categories:

  • Numerical Mathematics
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE