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A new model for the subgrid passive scalar flux
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
(English)Manuscript (Other academic)
Identifiers
URN: urn:nbn:se:kth:diva-5587OAI: oai:DiVA.org:kth-5587DiVA: diva2:10002
Note
QC 20101119Available from: 2006-04-10 Created: 2006-04-10 Last updated: 2010-11-19Bibliographically 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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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • vancouver
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More styles
Language
  • de-DE
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More languages
Output format
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  • asciidoc
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