Research into Topics in Transonic Flow Theory.
Abstract
The contract concerned certain research topics in transonic flow, mainly addressing the questions of why corrections for entropy and viscosity to transonic potential theory were large in certain cases. The physical implications arising from the accurate use of each of these corrections are incompatible. The investigations is due to the fact that the potential equation admits non-unique solution branches and that the corrections, in addition to modeling entropy and viscosity, allow the potential solution to change to the correct branch. The study into the causes of the nonuniqueness was based on an integral equation formulation and the following results obtained. (a) The nonuniqueness only occur if there is a supersonic domain in the flow. (b) A nonunique solution does not have the same supersonic domain as the real solution. (c) The solution often can be made unique in steady flow by using a mixed conservative/nonconservative algorithm; this cannot be guaranteed however. (d) There is no way to differentiate between a solution that is physically correct and one that is not physically correct.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1984
- Accession Number
- ADA148526
Entities
People
- D. Nixon
Organizations
- Nielsen Engineering & Research (United States)