A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

Philipp Nguyen; Juan Uribe; Imran Afgan; Dominique Laurence

A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

Philipp Nguyen, Juan Uribe, Imran Afgan, Dominique Laurence

EDF Energy Ltd

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

Abstract

A hybrid RANS/LES model is presented, in which RANS and LES contributions to the subgrid- scale (SGS) Reynolds stresses are computed on two distinct grids and are seamlessly blended. The instantaneous, fluctuating SGS Reynolds stress field is supported by a statistical RANS eddy viscosity model in regions where the LES grid is considered as coarse. The present hybrid model acts as a near-wall correction to the LES, while it retains the fluctuating nature of the flow field. The dual computation enables the LES to be run on grids with very low wall-normal resolution, while the RANS model is solved on wall-refined high-aspect ratio grids. Predictions of a heated plane channel flow for a range of Reynolds numbers are generally improved in comparison to conventional LES, with the wall-nearest grid point lying far in the logarithmic layer. Current work also includes a validation on a ribbed channel flow with high blockage ratio, where results are very promising.

Original language	English
Title of host publication	Proceedings of the Ninth International Symposium on Turbulence, Heat and Mass Transfer
Subtitle of host publication	Turbulence, Heat and Mass Transfer 9
Publisher	Begell House Publishers Inc.
ISBN (Electronic)	978-1-56700-468-7
ISBN (Print)	978-1-56700-467-0
Publication status	Published - 10 Jul 2018
Event	Ninth International Symposium on Turbulence, Heat and Mass Transfer - Rio de Janeiro, Rio de Janeiro, Brazil Duration: 10 Jul 2018 → 13 Jul 2018 Conference number: 9 http://thmt-18.org

Conference

Conference	Ninth International Symposium on Turbulence, Heat and Mass Transfer
Abbreviated title	THMT-18
Country/Territory	Brazil
City	Rio de Janeiro
Period	10/07/18 → 13/07/18
Internet address	http://thmt-18.org

1 Conference contribution

A seamless hybrid RANS/LES model with Dynamic Reynolds-Stress Correction for high Reynolds number flows on coarse grids
Nguyen, P., Uribe, J., Afgan, I. & Laurence, D., 26 Sept 2018, Proceedings of the 12th International ERCOFTAC Symposium on Engineering Turbulence Modelling and Measurements. Montpellier, France, 6 p.
Research output: Chapter in Book/Conference proceeding › Conference contribution › peer-review

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title = "A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows",

abstract = "A hybrid RANS/LES model is presented, in which RANS and LES contributions to the subgrid- scale (SGS) Reynolds stresses are computed on two distinct grids and are seamlessly blended. The instantaneous, fluctuating SGS Reynolds stress field is supported by a statistical RANS eddy viscosity model in regions where the LES grid is considered as coarse. The present hybrid model acts as a near-wall correction to the LES, while it retains the fluctuating nature of the flow field. The dual computation enables the LES to be run on grids with very low wall-normal resolution, while the RANS model is solved on wall-refined high-aspect ratio grids. Predictions of a heated plane channel flow for a range of Reynolds numbers are generally improved in comparison to conventional LES, with the wall-nearest grid point lying far in the logarithmic layer. Current work also includes a validation on a ribbed channel flow with high blockage ratio, where results are very promising.",

author = "Philipp Nguyen and Juan Uribe and Imran Afgan and Dominique Laurence",

year = "2018",

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booktitle = "Proceedings of the Ninth International Symposium on Turbulence, Heat and Mass Transfer",

publisher = "Begell House Publishers Inc.",

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note = "Ninth International Symposium on Turbulence, Heat and Mass Transfer, THMT-18 ; Conference date: 10-07-2018 Through 13-07-2018",

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Nguyen, P, Uribe, J, Afgan, I & Laurence, D 2018, A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows. in Proceedings of the Ninth International Symposium on Turbulence, Heat and Mass Transfer: Turbulence, Heat and Mass Transfer 9. Begell House Publishers Inc., Ninth International Symposium on Turbulence, Heat and Mass Transfer, Rio de Janeiro, Brazil, 10/07/18.

A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows. / Nguyen, Philipp; Uribe, Juan; Afgan, Imran et al.
Proceedings of the Ninth International Symposium on Turbulence, Heat and Mass Transfer: Turbulence, Heat and Mass Transfer 9. Begell House Publishers Inc., 2018.

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

TY - GEN

T1 - A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

AU - Nguyen, Philipp

AU - Uribe, Juan

AU - Afgan, Imran

AU - Laurence, Dominique

N1 - Conference code: 9

PY - 2018/7/10

Y1 - 2018/7/10

N2 - A hybrid RANS/LES model is presented, in which RANS and LES contributions to the subgrid- scale (SGS) Reynolds stresses are computed on two distinct grids and are seamlessly blended. The instantaneous, fluctuating SGS Reynolds stress field is supported by a statistical RANS eddy viscosity model in regions where the LES grid is considered as coarse. The present hybrid model acts as a near-wall correction to the LES, while it retains the fluctuating nature of the flow field. The dual computation enables the LES to be run on grids with very low wall-normal resolution, while the RANS model is solved on wall-refined high-aspect ratio grids. Predictions of a heated plane channel flow for a range of Reynolds numbers are generally improved in comparison to conventional LES, with the wall-nearest grid point lying far in the logarithmic layer. Current work also includes a validation on a ribbed channel flow with high blockage ratio, where results are very promising.

AB - A hybrid RANS/LES model is presented, in which RANS and LES contributions to the subgrid- scale (SGS) Reynolds stresses are computed on two distinct grids and are seamlessly blended. The instantaneous, fluctuating SGS Reynolds stress field is supported by a statistical RANS eddy viscosity model in regions where the LES grid is considered as coarse. The present hybrid model acts as a near-wall correction to the LES, while it retains the fluctuating nature of the flow field. The dual computation enables the LES to be run on grids with very low wall-normal resolution, while the RANS model is solved on wall-refined high-aspect ratio grids. Predictions of a heated plane channel flow for a range of Reynolds numbers are generally improved in comparison to conventional LES, with the wall-nearest grid point lying far in the logarithmic layer. Current work also includes a validation on a ribbed channel flow with high blockage ratio, where results are very promising.

M3 - Conference contribution

SN - 978-1-56700-467-0

BT - Proceedings of the Ninth International Symposium on Turbulence, Heat and Mass Transfer

PB - Begell House Publishers Inc.

T2 - Ninth International Symposium on Turbulence, Heat and Mass Transfer

Y2 - 10 July 2018 through 13 July 2018

ER -

A dual-grid hybrid RANS/LES model for under-resolved near-wall regions and its application to heated and separating flows

Abstract

Conference

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Research output

A seamless hybrid RANS/LES model with Dynamic Reynolds-Stress Correction for high Reynolds number flows on coarse grids

Cite this