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Direct numerical simulation of a compressible boundary-layer flow past an isolated three-dimensional hump in a high-speed subsonic regime

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Title: Direct numerical simulation of a compressible boundary-layer flow past an isolated three-dimensional hump in a high-speed subsonic regime
Authors: De Grazia, D
Moxey, D
Sherwin, SJ
Kravtsova, MA
Ruban, AI
Item Type: Journal Article
Abstract: In this paper we study the boundary-layer separation produced in a high-speed subsonic boundary layer by a small wall roughness. Specifically, we present a direct numerical simulation (DNS) of a two-dimensional boundary-layer flow over a flat plate encountering a three-dimensional Gaussian-shaped hump. This work was motivated by the lack of DNS data of boundary-layer flows past roughness elements in a similar regime which is typical of civil aviation. The Mach and Reynolds numbers are chosen to be relevant for aeronautical applications when considering small imperfections at the leading edge of wings. We analyze different heights of the hump: The smaller heights result in a weakly nonlinear regime, while the larger result in a fully nonlinear regime with an increasing laminar separation bubble arising downstream of the roughness element and the formation of a pair of streamwise counterrotating vortices which appear to support themselves.
Issue Date: 8-Feb-2018
Date of Acceptance: 15-Jun-2016
URI: http://hdl.handle.net/10044/1/58026
DOI: https://dx.doi.org/10.1103/PhysRevFluids.3.024101
ISSN: 2469-990X
Publisher: American Physical Society
Journal / Book Title: Physical Review Fluids
Volume: 3
Issue: 2
Copyright Statement: © 2018 American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/I037946/1
EP/L000407/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
SPECTRAL ELEMENT METHODS
ROUGHNESS ELEMENTS
TRAILING-EDGE
FLAT-PLATE
TRANSITION
SEPARATION
WAKES
ROW
Publication Status: Published
Article Number: ARTN 024101
Appears in Collections:Faculty of Engineering
Mathematics
Aeronautics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences



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