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High-resolution simulations of a turbulent boundary layer impacting two obstacles in tandem
Johannes Kepler Univ Linz, Dept Particulate Flow Modelling, A-4040 Linz, Austria..
Univ Politecn Valencia, Inst Univ Matemat Pura & Aplicada, Valencia 46022, Spain..
Parallel Works, Chicago, IL 60654 USA..
Univ Politecn Madrid, Sch Aerosp Engn, Madrid 28040, Spain..
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2023 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 8, no 6, article id 063801Article in journal (Refereed) Published
Abstract [en]

High-fidelity large-eddy simulations of the flow around two rectangular obstacles are carried out at a Reynolds number of 10 000 based on the freestream velocity and the obstacle height. The incoming flow is a developed turbulent boundary layer. Mean-velocity components, turbulence fluctuations, and the terms of the turbulent-kinetic-energy budget are analyzed for three flow regimes: skimming flow, wake interference, and isolated roughness. Three regions are identified where the flow undergoes the most significant changes: the first obstacle's wake, the region in front of the second obstacle, and the region around the second obstacle. In the skimming-flow case, turbulence activity in the cavity between the obstacles is limited and mainly occurs in a small region in front of the second obstacle. In the wake-interference case, there is a strong interaction between the freestream flow that penetrates the cavity and the wake of the first obstacle. This interaction results in more intense turbulent fluctuations between the obstacles. In the isolated-roughness case, the wake of the first obstacle is in good agreement with that of an isolated obstacle. Separation bubbles with strong turbulent fluctuations appear around the second obstacle.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2023. Vol. 8, no 6, article id 063801
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-332227DOI: 10.1103/PhysRevFluids.8.063801ISI: 001019511800001Scopus ID: 2-s2.0-85163934784OAI: oai:DiVA.org:kth-332227DiVA, id: diva2:1783584
Note

QC 20230722

Available from: 2023-07-22 Created: 2023-07-22 Last updated: 2023-07-22Bibliographically approved

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Vinuesa, Ricardo

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