Reynolds stress model for hypersonic flows

Despite the enormous increase in computational capabilities and the use of computational fluid dynamics as a design tool in the aircraft industry, the correct prediction of complex hypersonic turbulent flows involving shock wave boundary layer interaction (SWBLI) is still a challenge. For the investigation of these flows at real flight Reynolds number, the Reynolds Averaged Navier-Stokes equation (RANS) approach to turbulence is the only affordable tool at the moment. However, well-assessed turbulence models that are known to perform properly at lower speed, cannot be used in hypervelocity flows without a proper validation. In addition, for wall dominated flows with thick boundary-layers, strong shock/ boundary-layer interaction and with separation, as of interest for flight applications, the Boussinesq hypothesis, on which the widely used class of eddy-viscosity model is based, is not valid. Therefore a Reynolds stress model has been implemented. Generally, the use of second order closure models for the study of complex flows, has not been widely investigated both because of the numerical stiffness and the decreased numerical robustness. In this thesis the implemented model is firstly validated in the hypersonic, supersonic and subsonic regimes, comparing the results with data from the literature. Secondly the model is used to study a Scramjet intake. In the last part of the thesis the results of the experimental campaign are illustrated and compared with numerical findings using different turbulence models. The comparison shows that for turbulent hypersonic flows the use of a second order closure model can considerably improve the agreement with wind tunnel results in case of boundary layer separation.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2011

Author dc:creator

• Bosco, Arianna

Contributors dc:contributor

• Behr, Marek

• info:eu-repo/classification/ddc/620
• Hyperschall
• Turbulenz
• Reynoldssche Gleichung
• Reynoldssche Spannung
• Ingenieurwissenschaften
• Reynoldsspannungsmodell
• Reynolds-Spannungsmodell
• hypersonic flow
• turbulent flow
• Reynolds stress model
• RANS

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-124232%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62710