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Direct Numerical Simulations of Bypass Transition over Distributed Roughness
Karlsruhe Inst Technol, Inst Fluid Mech, Kaiserstr 10, D-76131 Karlsruhe, Germany..
Karlsruhe Inst Technol, Inst Fluid Mech, Kaiserstr 10, D-76131 Karlsruhe, Germany..ORCID iD: 0000-0001-9212-514X
Karlsruhe Inst Technol, Inst Fluid Mech, Kaiserstr 10, D-76131 Karlsruhe, Germany..
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-9627-5903
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2020 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385X, Vol. 58, no 2, p. 702-711Article in journal (Refereed) Published
Abstract [en]

Bypass transition in a boundary layer subjected to freestream turbulence and distributed surface roughness is studied numerically. The distributed surface roughness is reproduced with an immersed boundary technique, and the freestream turbulence is artificially generated by a superposition of eigenmodes of the Orr-Sommerfeld and Squire equations. Both an undisturbed laminar inflow and a disturbed inflow with freestream turbulence are studied. In either case a parametric study on the effects of the roughness size and density is carried out. The simulations reveal that the presence of roughness induces streaks in the laminar flow. When the freestream is turbulent, both roughness height and density show an impact on the onset of transition. The superposition of surface roughness and freestream turbulence causes amplified streaks. As a result, the streak instability occurs earlier within the boundary layer. The results show good qualitative and quantitative agreement to both experimental and numerical studies available in the literature.

Place, publisher, year, edition, pages
AMER INST AERONAUTICS ASTRONAUTICS , 2020. Vol. 58, no 2, p. 702-711
National Category
Mechanical Engineering
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URN: urn:nbn:se:kth:diva-269475DOI: 10.2514/1.J057765ISI: 000513533200015Scopus ID: 2-s2.0-85081170916OAI: oai:DiVA.org:kth-269475DiVA, id: diva2:1413292
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QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-05-25Bibliographically approved

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Schlatter, PhilippHanifi, ArdeshirHenningson, Dan S.

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