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Stochastic SGS modelling in homogeneous shear flow with passive scalars
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-9819-2906
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-2711-4687
2006 (English)In: Direct and Large-Eddy Simulation VI, DORDRECHT, NETHERLANDS: SPRINGER , 2006, Vol. 10, 167-174 p.Conference paper, Published paper (Refereed)
Abstract [en]

A new stochastic Smagorinsky model for the subgrid stress and subgid scalar flux is proposed. The new model is applied in LES of rotating homogeneous shear flow, which is an excellent case for developing and testing subgrid scale models. The proposed model provides for backscatter of energy and scalar variance, and reduces the length scale of the subgrid dissipation compared to the standard Smagorinsky model. At the same time, the flatness factor of the subgrid dissipation obtained from the stochastic model is of the same order of magnitude as for the Smagorinsky model.

Place, publisher, year, edition, pages
DORDRECHT, NETHERLANDS: SPRINGER , 2006. Vol. 10, 167-174 p.
Series
ERCOFTAC SERIES (EUROPEAN RESEARCH COMMUNITY ON FLOW, TURBULENCE AND COMBUSTION), 10
Keyword [en]
BACKSCATTER, TURBULENCE, ENERGY
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-26162DOI: 10.1007/978-1-4020-5152-2_19ISI: 000243102400019ISBN: 1-4020-4909-9 (print)OAI: oai:DiVA.org:kth-26162DiVA: diva2:371161
Conference
6th International ERCOFTAC Workshop on Direct and Large-Eddy Simulation, Univ Poitiers, Poitiers, FRANCE, SEP 12-14, 2005
Note
QC 20101119. Titeln ändrad från "Stochastic SGS modelling in rotating homogeneous shear flow with a passive scalar".Available from: 2010-11-19 Created: 2010-11-19 Last updated: 2011-10-05Bibliographically approved
In thesis
1. Subgrid-scale modelling for large-eddy simulation including scalar mixing in rotating turbulent shear flows
Open this publication in new window or tab >>Subgrid-scale modelling for large-eddy simulation including scalar mixing in rotating turbulent shear flows
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The aim of the present study is to develop subgrid-scale models that are relevant for complex flows and combustion. A stochastic model based on a stochastic Smagorinsky constant with adjustable variance and time scale is proposed. The stochastic model is shown to provide for backscatter of both kinetic energy and scalar variance without causing numerical instabilities. A new subgrid-scale scalar flux model is developed using the same kind of methodology that leads to the explicit algebraic scalar flux model, EASFM, for RANS. The new model predicts the anisotropy of the subgrid-scales in a more realistic way than the eddy diffusion model. Both new models were tested in rotating homogeneous shear flow with a passive scalar. Rogallo’s method of moving the frame with the mean flow to enable periodic boundary conditions was used to simulate homogeneous shear flow.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. v, 14 p.
Series
Trita-MEK, ISSN 0348-467X ; 2006:07
Keyword
Turbulence, large-eddy simulation, subgrid-scale model
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-3916 (URN)
Presentation
2006-04-28, D3, KTH borg, 100 44, Stockholm, 13:30
Opponent
Supervisors
Note
QC 20101119Available from: 2006-04-10 Created: 2006-04-10 Last updated: 2010-11-19Bibliographically approved

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Brethouwer, GeertJohansson, Arne

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