Large-eddy simulation of the OECD-NEA cold-leg mixing benchmark

被引：0

作者：

Hassan, Mubashir ^{[1
]}

Xiong, Jinbiao ^{[1
]}

Cheng, Xu ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China

来源：

ANNALS OF NUCLEAR ENERGY | 2022年 / 167卷

关键词：

Large-eddy simulation; Subgrid-scale model; Cold-leg mixing; Spectral analysis;

D O I：

10.1016/j.anucene.2021.108826

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Large Eddy Simulation (LES) was conducted to study the mixing of the two miscible fluids in the cold-leg mixing benchmark organized by OECD-NEA. A simulation set was implemented using different formula-tions of the large-eddy simulation Subgrid-scale models, i.e., Smagorinsky model, Dynamic model, and WALE model, to identify the influence of the SGS models on the simulation results. The estimation of the minimal mesh resolution for LES was studied. Spectral analysis of the velocity fluctuations in the cold-leg was examined. The time-average mean and root-mean-square (RMS) velocity of the three Subgrid-scale models were validated with PIV data and benchmark participant data in the cold-leg and downcomer. The mixing behavior of the fluid front was studied at different instants of time in the cold-leg and downcomer. Therefore, the strong turbulent mixing of the heavy fluid in the downcomer can cause a large temperature gradient in a loss-of-coolant accident (LOCA).(c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：14

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