Detached eddy simulation on the turbulent flow in a stirred tank

J. Gimbun, C. D. Rielly, Z. K. Nagy, J. J. Derksen

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

A detached eddy simulation (DES), a large-eddy simulation (LES), and a k-e-based Reynolds averaged Navier-Stokes (RANS) calculation on the single phase turbulent flow in a fully baffled stirred tank, agitated by a Rushton turbine is presented. The DES used here is based on the Spalart-Allmaras turbulence model solved on a grid containing about a million control volumes. The standard k-e and LES were considered here for comparison purposes. Predictions of the impeller-angle-resolved and time-averaged turbulent flow have been evaluated and compared with data from laser doppler anemometry measurements. The effects of the turbulence model on the predictions of the mean velocity components and the turbulent kinetic energy are most pronounced in the (highly anisotropic) trailing vortex core region, with specifically DES performing well. The LESthat was performed on the same grid as the DESappears to lack resolution in the boundary layers on the surface of the impeller. The findings suggest that DES provides a more accurate prediction of the features of the turbulent flows in a stirred tank compared with RANS-based models and at the same time alleviates resolution requirements of LES close to walls. (c) 2011 American Institute of Chemical Engineers AIChE J, 58: 32243241, 2012

Original languageEnglish
Pages (from-to)3224-3241
Number of pages18
JournalAIChE Journal
Volume58
Issue number10
Early online date28 Nov 2011
DOIs
Publication statusPublished - Oct 2012

Keywords

  • DES
  • RANS
  • angle resolved
  • vortex core
  • power number
  • turbulent kinetic energy
  • IMMERSED-BOUNDARY METHOD
  • RUSHTON TURBINE
  • NUMERICAL-SIMULATION
  • TRAILING VORTICES
  • LDA MEASUREMENTS
  • IMPELLER
  • CFD
  • PREDICTION
  • VESSELS
  • REACTOR

Cite this

Detached eddy simulation on the turbulent flow in a stirred tank. / Gimbun, J.; Rielly, C. D.; Nagy, Z. K.; Derksen, J. J.

In: AIChE Journal, Vol. 58, No. 10, 10.2012, p. 3224-3241.

Research output: Contribution to journalArticle

Gimbun, J. ; Rielly, C. D. ; Nagy, Z. K. ; Derksen, J. J. / Detached eddy simulation on the turbulent flow in a stirred tank. In: AIChE Journal. 2012 ; Vol. 58, No. 10. pp. 3224-3241.
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abstract = "A detached eddy simulation (DES), a large-eddy simulation (LES), and a k-e-based Reynolds averaged Navier-Stokes (RANS) calculation on the single phase turbulent flow in a fully baffled stirred tank, agitated by a Rushton turbine is presented. The DES used here is based on the Spalart-Allmaras turbulence model solved on a grid containing about a million control volumes. The standard k-e and LES were considered here for comparison purposes. Predictions of the impeller-angle-resolved and time-averaged turbulent flow have been evaluated and compared with data from laser doppler anemometry measurements. The effects of the turbulence model on the predictions of the mean velocity components and the turbulent kinetic energy are most pronounced in the (highly anisotropic) trailing vortex core region, with specifically DES performing well. The LESthat was performed on the same grid as the DESappears to lack resolution in the boundary layers on the surface of the impeller. The findings suggest that DES provides a more accurate prediction of the features of the turbulent flows in a stirred tank compared with RANS-based models and at the same time alleviates resolution requirements of LES close to walls. (c) 2011 American Institute of Chemical Engineers AIChE J, 58: 32243241, 2012",
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N1 - Acknowledgements The author (J.G.) is grateful to the scholarship from Ministry of Higher Education, Malaysia, and Universiti Malaysia Pahang. The author also acknowledges contributions from Professor Harry Van den Akkerand Dr. Henk Versteeg in shaping up the content of this article as his thesis examiner.

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AB - A detached eddy simulation (DES), a large-eddy simulation (LES), and a k-e-based Reynolds averaged Navier-Stokes (RANS) calculation on the single phase turbulent flow in a fully baffled stirred tank, agitated by a Rushton turbine is presented. The DES used here is based on the Spalart-Allmaras turbulence model solved on a grid containing about a million control volumes. The standard k-e and LES were considered here for comparison purposes. Predictions of the impeller-angle-resolved and time-averaged turbulent flow have been evaluated and compared with data from laser doppler anemometry measurements. The effects of the turbulence model on the predictions of the mean velocity components and the turbulent kinetic energy are most pronounced in the (highly anisotropic) trailing vortex core region, with specifically DES performing well. The LESthat was performed on the same grid as the DESappears to lack resolution in the boundary layers on the surface of the impeller. The findings suggest that DES provides a more accurate prediction of the features of the turbulent flows in a stirred tank compared with RANS-based models and at the same time alleviates resolution requirements of LES close to walls. (c) 2011 American Institute of Chemical Engineers AIChE J, 58: 32243241, 2012

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