Large eddy simulation on the turbulent mixing phenomena in 3×3 bare tight lattice rod bundle using spectral element method

Ju Haoran; Wang Mingjun; Wang Yingjie; Zhao Minfu; Tian Wenxi; Liu Tiancai; Su G.H.; Qiu Suizheng

doi:10.1016/j.net.2020.02.020

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자료유형: 학술저널

저자정보: Ju Haoran (Xi'an Jiaotong University) Wang Mingjun (Xi'an Jiaotong University) Wang Yingjie (Xi'an Jiaotong University) Zhao Minfu (China Institute of Atomic Energy) Tian Wenxi (Xi'an Jiaotong University) Liu Tiancai (China Institute of Atomic Energy) Su G.H. (Xi'an Jiaotong University) Qiu Suizheng (Xi'an Jiaotong University)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제9호

발행연도: 2020.9

수록면: 1,945 - 1,954 (10page)

DOI: 10.1016/j.net.2020.02.020

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Subchannel code is one of the effective simulation tools for thermal-hydraulic analysis in nuclear reactor core. In order to reduce the computational cost and improve the calculation ef?ciency, empirical cor- relation of turbulent mixing coef?cient is employed to calculate the lateral mixing velocity between adjacent subchannels. However, correlations utilized currently are often ?tted from data achieved in central channel of fuel assembly, which would simply neglect the wall effects. In this paper, the CFD approach based on spectral element method is employed to predict turbulent mixing phenomena through gaps in 3 3 bare tight lattice rod bundle and investigate the ?ow pulsation through gaps in different positions. Re ¼ 5000,10000,20500 and P/D ¼ 1.03 and 1.06 have been covered in the simulation cases. With a well veri?ed mesh, lateral velocities at gap center between corner channel and wall channel (WeCo), wall channel and wall channel (WeW), wall channel and center channel (WeC) as well as center channel and center channel (CeC) are collected and compared with each other. The obvious turbulent mixing distributions are presented in the different channels of rod bundle. The peak frequency values at WeCo channel could have about 40%e50% reduction comparing with the CeC channel value and the turbulent mixing coef?cient b could decrease around 25%. corrections for b should be performed in subchannel code at wall channel and corner channel for a reasonable prediction result. A preliminary analysis on ?uctuation at channel gap has also performed. Eddy cascade should be considered carefully in detailed analysis for ?uctuating in rod bundle

#Turbulent mixing #Rod bundle #CFD #Spectral element method

참고문헌 (33)

참고문헌 신청

E. Merzari / 2017 / Largescale large eddy simulation of nuclear reactor flows : issues and perspectives / Nucl. Eng. Des 312:86~98

M. Wang / 2017 / Multiscale thermal hydraulic study under the inadvertent safety injection system operation scenario of typical pressurized water reactor / Sci. Technol. Nucl. Ins :1~15

B. Kon car / 2018 / Simulation of turbulent flow in MATIS-H rod bundle with split-type mixing vanes / Nucl. Eng. Des 327:112~126

J. Xiong / 2018 / CFD simulation of swirling flow induced by twist vanes in a rod bundle / Nucl. Eng. Des 338:52~62

M. Wang / 2018 / Study on the coolant mixing phenomenon in a 45 T junction based on the thermal-mechanical coupling method / Appl. Therm. Eng 144:600~613

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