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A numerical study of homogeneous turbulence and passive scalar transport in rotating shear flow
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-9819-2906
2005 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Direct numerical simulations of homogeneous turbulent shear flow subject to spanwise rotation have been carried out. A passive scalar field with an imposed mean gradient was also included in the simulations. The flow reached a state close to the equilibrium structure with a slowly varying turbulence anisotropy and nondimensional shear number SK/ε. Different rotation numbers have been used in the simulations and the rotation either accelerated the growth of kinetic energy or slowed it down. The growth was approximately exponential in a few cases at intermediate shear times. At longer shear times the kinetic energy was growing linearly in most of the cases. The rotation affected considerably the anisotropy of the flow and the velocity correlations. The scalar-velocity fluctuation correlations and the direction of the turbulent scalar flux vector were according to the simulations also strongly influenced by rotation, even as the mechanical to scalar time scale ratio.

Place, publisher, year, edition, pages
2005. 99-104 p.
Series
4th International Symposium on Turbulence and Shear Flow Phenomena, Volume 1
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-148504Scopus ID: 2-s2.0-84867495407OAI: oai:DiVA.org:kth-148504DiVA: diva2:749433
Conference
4th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 4; Williamsburg, VA; United States; 27 June 2005 through 29 June 2005
Note

QC 20140924

Available from: 2014-09-24 Created: 2014-08-08 Last updated: 2014-09-24Bibliographically approved

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Brethouwer, Gert

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