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Explicit algebraic subgrid stress models with application to rotating channel flow

Published online by Cambridge University Press:  12 October 2009

LINUS MARSTORP ,
GEERT BRETHOUWER ,
OLOF GRUNDESTAM  and
ARNE V. JOHANSSON
LINUS MARSTORP
Affiliation:
Linné Flow Centre, Department of Mechanics, KTH, SE-100 44 Stockholm, Sweden
GEERT BRETHOUWER*
Affiliation:
Linné Flow Centre, Department of Mechanics, KTH, SE-100 44 Stockholm, Sweden
OLOF GRUNDESTAM
Affiliation:
Linné Flow Centre, Department of Mechanics, KTH, SE-100 44 Stockholm, Sweden
ARNE V. JOHANSSON
Affiliation:
Linné Flow Centre, Department of Mechanics, KTH, SE-100 44 Stockholm, Sweden
*
†Email address for correspondence: geert@mech.kth.se
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Abstract

New explicit subgrid stress models are proposed involving the strain rate and rotation rate tensor, which can account for rotation in a natural way. The new models are based on the same methodology that leads to the explicit algebraic Reynolds stress model formulation for Reynolds-averaged Navier–Stokes simulations. One dynamic model and one non-dynamic model are proposed. The non-dynamic model represents a computationally efficient subgrid scale (SGS) stress model, whereas the dynamic model is the most accurate. The models are validated through large eddy simulations (LESs) of spanwise and streamwise rotating channel flow and are compared with the standard and dynamic Smagorinsky models. The proposed explicit dependence on the system rotation improves the description of the mean velocity profiles and the turbulent kinetic energy at high rotation rates. Comparison with the dynamic Smagorinsky model shows that not using the eddy-viscosity assumption improves the description of both the Reynolds stress anisotropy and the SGS stress anisotropy. LESs of rotating channel flow at Reτ = 950 have been carried out as well. These reveal some significant Reynolds number influences on the turbulence statistics. LESs of non-rotating turbulent channel flow at Reτ = 950 show that the new explicit model especially at coarse resolutions significantly better predicts the mean velocity, wall shear and Reynolds stresses than the dynamic Smagorinsky model, which is probably the result of a better prediction of the anisotropy of the subgrid dissipation.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 639 , 25 November 2009 , pp. 403 - 432
Copyright
Copyright © Cambridge University Press 2009

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