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Formation of turbulent patterns near the onset of transition in plane Couette flow
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0001-9627-5903
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0001-7864-3071
2010 (engelsk)Inngår i: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 650, s. 119-129Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The formation of turbulent patterns in plane Couette flow is investigated near the onset of transition, using numerical simulation in a very large domain of size 800 h x 2h x 356 h. Based on a maximum observation time of 20 000 inertial units, the threshold for the appearance of sustained turbulent motion is Re-c = 324 +/- 1. For Re-c < Re <= 380, turbulent-banded patterns form, irrespective of whether the initial perturbation is a noise or localized disturbance. Measurements of the turbulent fraction versus Re show evidence for a discontinuous phase transition scenario where turbulent spots play the role of the nuclei. Using a smaller computational box, the angle selection of the turbulent bands in the early stages of their development is shown to be related to the amplitude of the initial perturbation.

sted, utgiver, år, opplag, sider
2010. Vol. 650, s. 119-129
Emneord [en]
Banded patterns, Computational box, In-plane, Inertial units, Initial perturbation, Large domain, Numerical simulation, Turbulent motion, Turbulent patterns, Turbulent spots, Computer simulation, Turbulent flow
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Identifikatorer
URN: urn:nbn:se:kth:diva-27539DOI: 10.1017/S0022112010000297ISI: 000278212500005Scopus ID: 2-s2.0-77952419597OAI: oai:DiVA.org:kth-27539DiVA, id: diva2:379222
Merknad
QC 20101217Tilgjengelig fra: 2010-12-17 Laget: 2010-12-13 Sist oppdatert: 2017-12-11bibliografisk kontrollert

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