Quasi-DNS of natural convection flow in a cylindrical annuli with an optimal polyhedral mesh refinement

Yacine Addad; Imama Zaidi; Dominique Laurence

doi:10.1016/j.compfluid.2015.06.014

Quasi-DNS of natural convection flow in a cylindrical annuli with an optimal polyhedral mesh refinement

Yacine Addad, Imama Zaidi, Dominique Laurence

University of Manchester

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22 Scopus citations

Abstract

A direct numerical simulation was used to study the buoyancy driven turbulent flow inside a horizontal annular cavity at Rayleigh number, Ra=1.18×10⁹, and cylinders diameters ratio of 4.85. Mean and rms temperature profiles are in good agreement with experiments. Turbulent kinetic energy budgets have been calculated to verify the accuracy of the unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. The code is found to return satisfactory results for first and second order statistics, and coherent turbulent kinetic energy budgets, except for the profile of the turbulence dissipation rate which may be underestimated due to 1% blended upwinding. The unstructured mesh was optimized using Kolmogorov scaling estimated by a precursor RANS simulation of this very inhomogeneous flow and two point correlations demonstrated that the domain size was sufficiently large.

Original language	British English
Pages (from-to)	44-52
Number of pages	9
Journal	Computers and Fluids
Volume	118
DOIs	https://doi.org/10.1016/j.compfluid.2015.06.014
State	Published - 2 Sep 2015

Keywords

Annular cavity
Co-axial cavity
Complex geometries
DNS
Natural convection flow
Polyhedral cells
Star-CCM+

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10.1016/j.compfluid.2015.06.014

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title = "Quasi-DNS of natural convection flow in a cylindrical annuli with an optimal polyhedral mesh refinement",

abstract = "A direct numerical simulation was used to study the buoyancy driven turbulent flow inside a horizontal annular cavity at Rayleigh number, Ra=1.18×109, and cylinders diameters ratio of 4.85. Mean and rms temperature profiles are in good agreement with experiments. Turbulent kinetic energy budgets have been calculated to verify the accuracy of the unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. The code is found to return satisfactory results for first and second order statistics, and coherent turbulent kinetic energy budgets, except for the profile of the turbulence dissipation rate which may be underestimated due to 1% blended upwinding. The unstructured mesh was optimized using Kolmogorov scaling estimated by a precursor RANS simulation of this very inhomogeneous flow and two point correlations demonstrated that the domain size was sufficiently large.",

keywords = "Annular cavity, Co-axial cavity, Complex geometries, DNS, Natural convection flow, Polyhedral cells, Star-CCM+",

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

note = "Funding Information: The numerical runs for the concentric cavity and channel flow have been performed in the AMD Opteron 1200 cores Khalifa University HPC cluster. Second author is grateful for a PG fellowship from Pakistan education ministry. Last author{\textquoteright}s contribution was supported by the UK Research Council “CARE” project EPSRC/H010998/1. Publisher Copyright: {\textcopyright} 2015 Elsevier Ltd.",

year = "2015",

month = sep,

day = "2",

doi = "10.1016/j.compfluid.2015.06.014",

language = "British English",

volume = "118",

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T1 - Quasi-DNS of natural convection flow in a cylindrical annuli with an optimal polyhedral mesh refinement

AU - Addad, Yacine

AU - Zaidi, Imama

AU - Laurence, Dominique

N1 - Funding Information: The numerical runs for the concentric cavity and channel flow have been performed in the AMD Opteron 1200 cores Khalifa University HPC cluster. Second author is grateful for a PG fellowship from Pakistan education ministry. Last author’s contribution was supported by the UK Research Council “CARE” project EPSRC/H010998/1. Publisher Copyright: © 2015 Elsevier Ltd.

PY - 2015/9/2

Y1 - 2015/9/2

N2 - A direct numerical simulation was used to study the buoyancy driven turbulent flow inside a horizontal annular cavity at Rayleigh number, Ra=1.18×109, and cylinders diameters ratio of 4.85. Mean and rms temperature profiles are in good agreement with experiments. Turbulent kinetic energy budgets have been calculated to verify the accuracy of the unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. The code is found to return satisfactory results for first and second order statistics, and coherent turbulent kinetic energy budgets, except for the profile of the turbulence dissipation rate which may be underestimated due to 1% blended upwinding. The unstructured mesh was optimized using Kolmogorov scaling estimated by a precursor RANS simulation of this very inhomogeneous flow and two point correlations demonstrated that the domain size was sufficiently large.

AB - A direct numerical simulation was used to study the buoyancy driven turbulent flow inside a horizontal annular cavity at Rayleigh number, Ra=1.18×109, and cylinders diameters ratio of 4.85. Mean and rms temperature profiles are in good agreement with experiments. Turbulent kinetic energy budgets have been calculated to verify the accuracy of the unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. The code is found to return satisfactory results for first and second order statistics, and coherent turbulent kinetic energy budgets, except for the profile of the turbulence dissipation rate which may be underestimated due to 1% blended upwinding. The unstructured mesh was optimized using Kolmogorov scaling estimated by a precursor RANS simulation of this very inhomogeneous flow and two point correlations demonstrated that the domain size was sufficiently large.

KW - Annular cavity

KW - Co-axial cavity

KW - Complex geometries

KW - DNS

KW - Natural convection flow

KW - Polyhedral cells

KW - Star-CCM+

UR - http://www.scopus.com/inward/record.url?scp=84935000012&partnerID=8YFLogxK

U2 - 10.1016/j.compfluid.2015.06.014

DO - 10.1016/j.compfluid.2015.06.014

M3 - Article

AN - SCOPUS:84935000012

SN - 0045-7930

VL - 118

SP - 44

EP - 52

JO - Computers and Fluids

JF - Computers and Fluids

ER -

Quasi-DNS of natural convection flow in a cylindrical annuli with an optimal polyhedral mesh refinement

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Keywords

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