Flow Field Matching.
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 Green's 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1978
- Accession Number
- ADA050323
Entities
People
- Allen W. Chen
- Ki D. Lee
- Lawrence J. Dickson
- Paul E. Rubbert
Organizations
- Boeing