何建勇,高洋洋,王立忠,沃恩海,张卓先.悬链线管体三维流场数值模拟研究[J].海洋工程,2021,39(5):119~134
悬链线管体三维流场数值模拟研究
Three-dimensional numerical simulation of flow past a catenary riser
投稿时间:2020-11-17  
DOI:10.16483/j.issn.1005-9865.2021.05.013
中文关键词:  弯管绕流  瞬时尾流  时均流场  时均压力系数  涡脱频率
英文关键词:flow past a curved cylinder  instantaneous wake pattern  time-averaged flow field  time-averaged pressure coefficients  vortex shedding frequency
基金项目:国家自然科学基金项目(51939010);浙江省自然科学基金资助项目(LHZ19E090004)
作者单位E-mail
何建勇 浙江大学 海洋学院, 浙江 舟山 316021  
高洋洋 浙江大学 海洋学院, 浙江 舟山 316021 yygao@zju.edu.cn 
王立忠 浙江大学 海洋学院, 浙江 舟山 316021  
沃恩海 浙江省海港投资运营集团有限公司, 浙江 宁波 315040  
张卓先 浙江省海港投资运营集团有限公司, 浙江 宁波 315040  
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中文摘要:
      基于计算流体力学开源代码OpenFOAM开展不同雷诺数(100≤Re≤3 900)下弯曲管体绕流流场三维数值模拟研究。对比分析不同雷诺数条件下弯曲管体的瞬时和时均流场特征,研究了弯曲管体不同位置处的时均压力系数和旋涡脱落频率。结果表明:当Re=100时,尾流中仅有展向涡存在;当300≤Re≤3 900时,流向涡出现且强度逐渐增加,展向涡减弱,随着局部曲率增大,沿弯管展向涡脱强度减小。随着雷诺数的增大,回流区沿流向的延伸尺度减小,但其沿展向的分布范围增大。沿弯管展向随着深度减小,前后驻点时均压力系数的绝对值递减,圆周时均压力系数变化幅度减小。在300≤Re≤3 900范围内,管体曲率会对展向涡脱频率产生一定影响。
英文摘要:
      A series of three-dimensional numerical simulations are performed to investigate flow past a curved cylinder at different Reynolds numbers (100 ≤ Re ≤ 3 900) based on the computational fluid dynamics open source code OpenFOAM. The effects of Reynolds number on the instantaneous and time-averaged wake flow characteristics, the mean pressure coefficients and vortex shedding frequencies are investigated. The results show that only spanwise vortices exist in the wake at Re=100, the streamwise vortices appear and the vorticity intensity gradually increases, while the spanwise vortices become weakened at 300 ≤ Re ≤ 3 900. The intensity of vortex shedding decreases along the spanwise due to the increasing of local curvature. The scale of recirculation zone decreases with the increase of Reynolds number in the flow direction, but increases along the spanwise of curved cylinder. The absolute values of the front and rear stagnation pressure coefficients decrease along the spanwise as the depth lowers, and the discrepancy of the time-averaged pressure coefficients on the cylinder surface decreases. The axial curvature has an effect on the vortex shedding frequency at 300 ≤ Re ≤ 3 900.
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