Modeling Strategies for Unsteady Turbulent Flows in the Lower Plenum of the VHTR.

Johnson, R. W.

Technical Information Center Oak Ridge Tennessee

关键词: VHTR reactor;    Computational fluid dynamic;    Flow models;    Turbulent flow;    Very high temperature Reactor(VHTR);   

RP-ID  :  DE2007911700

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Validation simulations are presented for turbulent flow in a staggered tube bank, geometry similar to that in the lower plenum of a block very high temperature reactor. Steady 2D RANS predictions are compared to unsteady 2D RANS results and experiment. The unsteady calculations account for the fact that nonturbulent fluctuations (due to vortex-shedding) are present in the flow. The unsteady computations are shown to predict the mean variables and the total shear stress quite well. Previous workers have presented results that indicated that 3D simulations were necessary to obtain reasonable results. Best practices are based on requirements for the ASME Journal of Fluids Engineering.