DNS of buoyancy driven flow inside a horizontal coaxial cylinder

Imama Zaidi; Yacine Addad; Dominique Laurence

doi:10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.520

DNS of buoyancy driven flow inside a horizontal coaxial cylinder

Imama Zaidi
, Yacine Addad
, Dominique Laurence

University of Manchester

Research output: Contribution to journal › Conference article › peer-review

Abstract

A direct numerical simulation of the buoyancy driven turbulent flow inside a horizontal annular cavity has been carried out at higher Rayleigh number, Ra = 1.18x10⁹, and the cylinders ratio of 4.87. Kinetic energy budgets have been calculated to verify the accuracy of the CCM+ unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. Comparison of DNS results with wall resolved URANS models shows that the later models are able to capture the general flow features but fail to predict the large unsteadiness and high turbulence levels in the plume. However local heat transfer rates along the inner and outer cylinder walls are on average of acceptable accuracy for engineering purposes.

Original language	British English
Pages (from-to)	469-479
Number of pages	11
Journal	Proceedings of the International Symposium on Turbulence, Heat and Mass Transfer
Volume	2012-September
DOIs	https://doi.org/10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.520
State	Published - 2012
Event	7th International Symposium On Turbulence, Heat and Mass Transfer, THMT 2012 - Palermo, Italy Duration: 24 Sep 2012 → 27 Sep 2012

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10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.520

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title = "DNS of buoyancy driven flow inside a horizontal coaxial cylinder",

abstract = "A direct numerical simulation of the buoyancy driven turbulent flow inside a horizontal annular cavity has been carried out at higher Rayleigh number, Ra = 1.18x109, and the cylinders ratio of 4.87. Kinetic energy budgets have been calculated to verify the accuracy of the CCM+ unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. Comparison of DNS results with wall resolved URANS models shows that the later models are able to capture the general flow features but fail to predict the large unsteadiness and high turbulence levels in the plume. However local heat transfer rates along the inner and outer cylinder walls are on average of acceptable accuracy for engineering purposes.",

author = "Imama Zaidi and Yacine Addad and Dominique Laurence",

note = "Publisher Copyright: {\textcopyright} 2012 Begell House, Inc.; 7th International Symposium On Turbulence, Heat and Mass Transfer, THMT 2012 ; Conference date: 24-09-2012 Through 27-09-2012",

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TY - JOUR

T1 - DNS of buoyancy driven flow inside a horizontal coaxial cylinder

AU - Zaidi, Imama

AU - Addad, Yacine

AU - Laurence, Dominique

PY - 2012

Y1 - 2012

N2 - A direct numerical simulation of the buoyancy driven turbulent flow inside a horizontal annular cavity has been carried out at higher Rayleigh number, Ra = 1.18x109, and the cylinders ratio of 4.87. Kinetic energy budgets have been calculated to verify the accuracy of the CCM+ unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. Comparison of DNS results with wall resolved URANS models shows that the later models are able to capture the general flow features but fail to predict the large unsteadiness and high turbulence levels in the plume. However local heat transfer rates along the inner and outer cylinder walls are on average of acceptable accuracy for engineering purposes.

AB - A direct numerical simulation of the buoyancy driven turbulent flow inside a horizontal annular cavity has been carried out at higher Rayleigh number, Ra = 1.18x109, and the cylinders ratio of 4.87. Kinetic energy budgets have been calculated to verify the accuracy of the CCM+ unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. Comparison of DNS results with wall resolved URANS models shows that the later models are able to capture the general flow features but fail to predict the large unsteadiness and high turbulence levels in the plume. However local heat transfer rates along the inner and outer cylinder walls are on average of acceptable accuracy for engineering purposes.

UR - https://www.scopus.com/pages/publications/85073482204

U2 - 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.520

DO - 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.520

M3 - Conference article

AN - SCOPUS:85073482204

SN - 2377-2816

VL - 2012-September

SP - 469

EP - 479

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

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

T2 - 7th International Symposium On Turbulence, Heat and Mass Transfer, THMT 2012

Y2 - 24 September 2012 through 27 September 2012

ER -

DNS of buoyancy driven flow inside a horizontal coaxial cylinder

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