Computational Fluid Dynamics CFD:

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KNOO/WP4 Meeting, Manchester, 25th May 2007
Computational Fluid Dynamics (CFD) Numerical
Investigation of Vertical Flows in Core of
Gas-Cooled Reactors Amir Keshmiri (WP1/WP4),
Stefano Rolfo (WP1) Dominique Laurence, Mark
Cotton, Yacine Addad School of Mechanical,
Aerospace Civil Engineering (MACE) The
University of Manchester
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OUTLINE

• Introduction to AGRs
• Ascending/Descending Flows
• The Geometry Studied
• RANS Results
• LES Results (by Y. Addad)
• Future Work (by D. Laurence)

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Advanced Gas-Cooled Reactors (AGRs)
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Advanced Gas-Cooled Reactors (AGRs)
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Ascending/Descending Flows Enhancement/Impairmen
t of Heat Transfer
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The Geometry

• In-House Code (CONVERT)
• Commercial CFD Package (STAR-CD)
• Industrial Code (Code_Saturne)

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The Governing Equations
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RANS Results

• The analysis focuses on 4 cases
• Gr/Re20.0 ? Forced Convection
• Gr/Re20.063 ? Forced/Mixed Convection
• Gr/Re20.087 ? Re-Laminarization
• Gr/Re20.241 ? Recovery

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RANS Results

• The Turbulence Models Tested
• Launder-Sharma k-e model
• Cotton-Ismael k-e-S model
• Chen k-e model
• Suga NLEVM
• k-? SST model
• V2f model

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Variation of Nusselt Number
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Variation of Coefficient of Friction
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Gr/Re20.0
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Gr/Re20.0
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Gr/Re20.0
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Gr/Re20.087
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Gr/Re20.087
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Gr/Re20.087
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Gr/Re20.241
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Gr/Re20.241
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Gr/Re20.241
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• THE END