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Large-scale friction control in turbulent wall flow
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0001-9627-5903
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-1663-3553
Vise andre og tillknytning
2015 (engelsk)Inngår i: 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, TSFP-9 , 2015Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The present study reconsiders the control scheme proposed by Schoppa & Hussain [Phys Fluids 10:1049-1051 (1998)], using new sets of numerical simulations in a turbulent channel at a friction Reynolds number of 180. In particular, it is aimed at better characterising the physics of the control as well as investigate the optimal parameters. Results indicate that a clear maximum efficiency in drag reduction is reached for the case with a viscous-scaled spanwise wavelength of the vortices of 1200, which yields a drag reduction of 18%, contrary to the smaller wavelength of 400 suggested as the most efficient vortex in Schoppa & Hussain.

sted, utgiver, år, opplag, sider
TSFP-9 , 2015.
Emneord [en]
Drag, Drag reduction, Friction, Reynolds number, Turbulence, Vortex flow, Wall flow, Control schemes, Friction control, Maximum Efficiency, Optimal parameter, Turbulent channels, Shear flow
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-222965Scopus ID: 2-s2.0-85034434745ISBN: 9780000000002 (tryckt)OAI: oai:DiVA.org:kth-222965DiVA, id: diva2:1193330
Konferanse
9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015, 30 June 2015 through 3 July 2015
Merknad

QC 20180326

Tilgjengelig fra: 2018-03-26 Laget: 2018-03-26 Sist oppdatert: 2018-03-26bibliografisk kontrollert

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Schlatter, PhilippÖrlü, Ramis

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