Reliability of Large-Eddy Simulation of Buoyancy-Driven Turbulent Mixing

Bernardus J. Geurts

Reliability of Large-Eddy Simulation of Buoyancy-Driven Turbulent Mixing

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

The effects of unstable stratification on the turbulent transport in a shear layer are quantified by monitoring global geometric properties of constant density surfaces, such as their area and wrinkling. The flow is simulated using direct and large-eddy simulation, in which regularization modeling for the sub-grid scales in the momentum and the scalar equations is adopted and compared to dynamic sub-grid modeling. We establish the accuracy of the Leray regularization approach for the fluid flow and the scalar mixing.
The LANS-α model was found to lead to an overestimation of the small scales, particularly at coarse grids. Predictions based on dynamic models were found to be comparable to the Leray model, but require more computational effort and do not provide a systematic framework for deriving sub-filter closure for complex problems.

Original language	English
Title of host publication	Proceedings of the V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010
Editors	J.C.F Pereira, A. Sequeira, J.M.C. Pereira
Place of Publication	Lisbon
Publisher	Technical University of Lisbon
Number of pages	12
ISBN (Print)	978-989-96778-1-4
Publication status	Published - 2010
Event	5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010 - Lisbon, Portugal Duration: 14 Jun 2010 → 17 Jun 2010 Conference number: 5

Conference

Conference	5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010
Abbreviated title	ECCOMAS ECFD 2010
Country	Portugal
City	Lisbon
Period	14/06/10 → 17/06/10

Keywords

Stratified turbulence
Mixing
Large-eddy simulation
Regularization models

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@inproceedings{72a8db6e3c35434e81b9a9bfdef3e72e,

title = "Reliability of Large-Eddy Simulation of Buoyancy-Driven Turbulent Mixing",

abstract = "The effects of unstable stratification on the turbulent transport in a shear layer are quantified by monitoring global geometric properties of constant density surfaces, such as their area and wrinkling. The flow is simulated using direct and large-eddy simulation, in which regularization modeling for the sub-grid scales in the momentum and the scalar equations is adopted and compared to dynamic sub-grid modeling. We establish the accuracy of the Leray regularization approach for the fluid flow and the scalar mixing.The LANS-α model was found to lead to an overestimation of the small scales, particularly at coarse grids. Predictions based on dynamic models were found to be comparable to the Leray model, but require more computational effort and do not provide a systematic framework for deriving sub-filter closure for complex problems.",

keywords = "Stratified turbulence, Mixing, Large-eddy simulation, Regularization models",

author = "Geurts, {Bernardus J.}",

year = "2010",

language = "English",

isbn = "978-989-96778-1-4",

editor = "J.C.F Pereira and A. Sequeira and J.M.C. Pereira",

booktitle = "Proceedings of the V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010",

publisher = "Technical University of Lisbon",

note = "5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010, ECCOMAS ECFD 2010 ; Conference date: 14-06-2010 Through 17-06-2010",

}

Geurts, BJ 2010, Reliability of Large-Eddy Simulation of Buoyancy-Driven Turbulent Mixing. in JCF Pereira, A Sequeira & JMC Pereira (eds), Proceedings of the V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010., 01460, Technical University of Lisbon, Lisbon, 5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010, Lisbon, Portugal, 14/06/10.

Reliability of Large-Eddy Simulation of Buoyancy-Driven Turbulent Mixing. / Geurts, Bernardus J.

Proceedings of the V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010. ed. / J.C.F Pereira; A. Sequeira; J.M.C. Pereira. Lisbon : Technical University of Lisbon, 2010. 01460.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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T1 - Reliability of Large-Eddy Simulation of Buoyancy-Driven Turbulent Mixing

AU - Geurts, Bernardus J.

N1 - Conference code: 5

PY - 2010

Y1 - 2010

N2 - The effects of unstable stratification on the turbulent transport in a shear layer are quantified by monitoring global geometric properties of constant density surfaces, such as their area and wrinkling. The flow is simulated using direct and large-eddy simulation, in which regularization modeling for the sub-grid scales in the momentum and the scalar equations is adopted and compared to dynamic sub-grid modeling. We establish the accuracy of the Leray regularization approach for the fluid flow and the scalar mixing.The LANS-α model was found to lead to an overestimation of the small scales, particularly at coarse grids. Predictions based on dynamic models were found to be comparable to the Leray model, but require more computational effort and do not provide a systematic framework for deriving sub-filter closure for complex problems.

AB - The effects of unstable stratification on the turbulent transport in a shear layer are quantified by monitoring global geometric properties of constant density surfaces, such as their area and wrinkling. The flow is simulated using direct and large-eddy simulation, in which regularization modeling for the sub-grid scales in the momentum and the scalar equations is adopted and compared to dynamic sub-grid modeling. We establish the accuracy of the Leray regularization approach for the fluid flow and the scalar mixing.The LANS-α model was found to lead to an overestimation of the small scales, particularly at coarse grids. Predictions based on dynamic models were found to be comparable to the Leray model, but require more computational effort and do not provide a systematic framework for deriving sub-filter closure for complex problems.

KW - Stratified turbulence

KW - Mixing

KW - Large-eddy simulation

KW - Regularization models

M3 - Conference contribution

SN - 978-989-96778-1-4

BT - Proceedings of the V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010

A2 - Pereira, J.C.F

A2 - Sequeira, A.

A2 - Pereira, J.M.C.

PB - Technical University of Lisbon

CY - Lisbon

T2 - 5th European Conference on Computational Fluid Dynamics, ECCOMAS ECFD 2010

Y2 - 14 June 2010 through 17 June 2010

ER -