ARTICLE:

• TURBULENT NATURAL CONVECTION WITH AN INTERNAL HEAT SOURCE IN A SEMICIRCULAR GEOMETRY  download article

H. Lee
Nuclear and Mechanical Engineering Department, Korea Power Engineering Company Inc., 360-9 Mabuk-ri, Guseong-myun, Yongin-shi, Kyunggi-do 449-713, KOREA

Goon Cherl Park
Department of Nuclear Engineering, Seoul National University, Shillim-Dong, Gwanak-Gu, Seoul 151-742, Korea

K. Y. Suh
Department of Nuclear Engineering, Seoul National University, San 56-1, Sillim-dong, Kwanak-gu, Seoul 151-742, Korea

ABSTRACT

This paper presents the computational modeling of buoyancy-driven turbulent heat transfer involving spatially uniform volumetric heat sources in a semicircular geometry. The Launder-Sharma low-Reynolds number k-e turbulence model and the SIMPLER computational algorithm, which was incorporated into the HITNIS computer code, were used for determining the variations of the thermal-hydraulic variables, including flow patterns and temperature fields, etc. for the modified Rayleigh number of Ra' = 1×10¹⁵. The numerical instability could be minimized by restricting the application range of the near-wall treatment functions of D and E, by adjusting grid size and under-relaxation factors, and by application of a pseudo-transient approach.

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