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Characterization of the massively separated wake behind a square cylinder by means of direct numerical simulation
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-6570-5499
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7864-3071
2016 (English)In: Springer Proceedings in Physics, Springer Science+Business Media B.V., 2016, 259-266 p.Conference paper (Refereed)
Abstract [en]

The massively separated wake behind a wall-mounted square cylinder is investigated by means of direct numerical simulation (DNS). The effect of inflow conditions is assessed by considering two different cases with matching momentum thickness Reynolds numbers Reθ ≃ 1000 at the location of the cylinder: one with a fully-turbulent boundary layer as inflow condition, and another one with a laminar boundary layer. The main simulation is performed by using the spectral element code Nek5000. While in the laminar-inflow simulation the horseshoe vortex forming around the cylinder can be observed in the instantaneous flow fields, this is not the case in the turbulent-inflow simulation. Besides, the streaks in the turbulent case become greatly attenuated on both sides of the obstacle. By analyzing the Reynolds shear stress uv, we show that this is due to the modulation of the horseshoe vortex by the turbulence from the incoming boundary layer. © Springer International Publishing Switzerland 2016.

Place, publisher, year, edition, pages
Springer Science+Business Media B.V., 2016. 259-266 p.
Keyword [en]
Boundary layer flow, Boundary layers, Computational fluid dynamics, Cylinders (shapes), Direct numerical simulation, Laminar boundary layer, Numerical models, Reynolds number, Shear stress, Turbulence, Vortex flow, Wakes, Horseshoe vortices, Inflow conditions, Instantaneous flow, Momentum thickness, Reynolds shear stress, Spectral element, Square cylinders, Turbulent boundary layers, Atmospheric thermodynamics
National Category
Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-194626DOI: 10.1007/978-3-319-30602-5_32ISI: 000387431400032ScopusID: 2-s2.0-84979052172ISBN: 9783319306001 (print)OAI: oai:DiVA.org:kth-194626DiVA: diva2:1043816
Conference
5th International Conference on Jets, Wakes and Separated Flows, ICJWSF2015, 15 June 2015 through 18 June 2015
Note

Correspondence Address: Vinuesa, R.; Linné FLOW Centre, KTH Mechanics, Osquars Backe 18, Sweden; email: rvinuesa@mech.kth.se. QC 20161101

Available from: 2016-11-01 Created: 2016-10-31 Last updated: 2017-01-10Bibliographically approved

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