| 串列双圆柱绕流问题数值模拟的多尺度分析 |
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| 引用本文： | 崔雪扬,曹博超,徐弘一.串列双圆柱绕流问题数值模拟的多尺度分析[J].复旦学报(自然科学版),2017,56(3). |
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| 作者姓名： | 崔雪扬 曹博超 徐弘一 |
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| 作者单位： | 复旦大学航空航天系,上海,200433 |
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| 基金项目： | 国家自然科学基金重大研究计划培育项目，上海千人计划启动项目，上海教育委员会、中航商业发动机、复旦大学数值仿真联合创新中心项目 |
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| 摘 要： | 运用有限体积法,对串列放置的双圆柱二维不可压缩流动进行了直接数值计算.在分析Strouhal数及升阻力系数等积分量的基础上,本文从流动多尺度层面研究了流场分布及涡结构.通过对速度场的流动显示和频谱分析,确定了涡脱落的多个频率,以及分别受上游圆柱和下游圆柱边界层扰动形成的多尺度涡的相互作用,并且发现由于多尺度涡的相互作用形成了更小尺度涡的过程及机理.最后,进一步将这些涡结构与流场模态对应起来,使得流场结构更加清晰地展现出来.
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| 关 键 词： | 串列双圆柱 直接数值模拟 多尺度 涡脱落 脱落频率 |
Multi-scale Analysis of Numerical Simulation about Flow around Double Cylinders in Tandem |
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| CUI Xueyang,CAO Bochao,XU Hongyi.Multi-scale Analysis of Numerical Simulation about Flow around Double Cylinders in Tandem[J].Journal of Fudan University(Natural Science),2017,56(3). |
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| Authors: | CUI Xueyang CAO Bochao XU Hongyi |
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| Abstract: | Two-dimensional flow around double cylinders in tandem was calculated,using the finite volume method.Based on the comparisons of the Strouhal number and the lift and drag coefficients with the relevant researches,the flow field and its vortex structure were further investigated.Flow visualizations were conducted and the spectrum and POD analyses were performed to study the vortex shedding and their respective interactions.The formation of the smaller vortex scales were found due to the vortex interactions.The vortex structure and the modes of flow-field exhibited their distinctive structures in terms of their symmetrically and unsymmetrically characteristic distributions in space. |
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| Keywords: | double cylinders in tandem direct numerical simulation multi-scale flow vortex shedding shedding frequency |
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