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Direct numerical simulation of supersonic turbulent flows around a tandem expansion-compression corner

Zheltovodov, Alexandr A.; Fang, Jian; Yao, Yufeng; Li, Zhaorui; Lu, Lipeng

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Authors

Alexandr A. Zheltovodov

Jian Fang

Yufeng Yao Yufeng.Yao@uwe.ac.uk
Professor in Aerospace Engineering

Zhaorui Li

Lipeng Lu



Abstract

© 2015 AIP Publishing LLC. The M = 2.9 supersonic turbulent flows over a tandem expansion-compression corner configuration with a sharp deflection angle of 25° at three Reynolds numbers Reδ = 20 000, 40 000, and 80 000 were studied by using direct numerical simulation. The flow statistics were validated against available experimental measurements and other numerical predictions. The flow structures and turbulence statistics were detailed visualized and analysed for the Reδ = 40 000 case, especially in the interaction region where flow separation and reattachment occurred. It was found that during the expansion process, the boundary layer exhibited a characteristic two-layer structure also discovered in previous experimental studies, and the turbulence evolved differently within these two layers. In the outer layer, the turbulence was consistently suppressed along the ramp to a large extent, while in the inner layer, it was suppressed only in a small region around the expansion corner, and the near-wall quasi-streamwise vortices were well preserved. Flow patterns near the reattachment line have shown the existence of the Görtler-type vortices, which would largely amplify turbulence fluctuations in the near-wall region, thus promoting the regeneration of wall turbulence that in turn contributed to the redevelopment of a downstream turbulent boundary layer. The Reynolds number effects and the characteristics of coherent structures were also discussed. With the increase of the Reynolds number, the separation bubble size decreased, but the pattern and the characteristic size of wall streamlines near the reattachment line were preserved.

Journal Article Type Article
Publication Date Dec 1, 2015
Journal Physics of Fluids
Print ISSN 1070-6631
Electronic ISSN 1089-7666
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 27
Issue 12
Pages 125104
Institution Citation Zheltovodov, A. A., Fang, J., Yao, Y., Zheltovodov, A., Li, Z., & Lu, L. (2015). Direct numerical simulation of supersonic turbulent flows around a tandem expansion-compression corner. Physics of Fluids, 27(12), 125104. https://doi.org/10.1063/1.4936576
DOI https://doi.org/10.1063/1.4936576
Keywords simulation, supersonic turbulent flow, tandem expansion-compression corner
Publisher URL http://dx.doi.org/10.1063/1.4936576

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