Assessment of the RANS Turbulence Models for a Turbulent Flow and Heat Transfer in a Rod Bundle

Journal Article · Wed Jun 15 04:00:00 EDT 2005 · Nuclear Technology

OSTI ID:20840270

In, Wang-Kee; Chun, Tae-Hyun ^[1]

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1. Korea Atomic Energy Research Institute (Korea, Republic of)

A computational fluid dynamics (CFD) analysis has been performed to assess the Reynolds Average Navier-Stokes (RANS) turbulence models to predict a turbulent flow and heat transfer in a triangular rod bundle with pitch-to-diameter ratios (P/Ds) of 1.06 and 1.12. The CFD predictions using various turbulence models were compared with experimental results. Anisotropic turbulence models such as the nonlinear k - [curly epsilon] and the second-order closure models predicted the turbulence-driven secondary flow in the triangular channel and the distributions of the time mean velocity and temperature showing significantly improved agreement with the measurements from the linear standard k - [curly epsilon] model. The anisotropic turbulence models predicted the turbulence structure for a rod bundle with a large P/D fairly well but could not predict the very high turbulence intensity of the azimuthal velocity observed in the narrow flow region (gap) for a rod bundle with a small P/D.

• OSTI ID: 20840270
• Journal Information: Nuclear Technology, Journal Name: Nuclear Technology Journal Issue: 3 Vol. 150; ISSN 0029-5450; ISSN NUTYBB
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPUTERIZED SIMULATION
FLUID MECHANICS
FUEL ELEMENT CLUSTERS
HEAT TRANSFER
NAVIER-STOKES EQUATIONS
NONLINEAR PROBLEMS
PITCHES
REYNOLDS NUMBER
TURBULENCE
TURBULENT FLOW