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Transverse surface waves in steady uniform and non-uniform flows through an array of emergent and slightly submerged square cylinders
Journal of Hydraulic Research ( IF 2.3 ) Pub Date : 2019-10-30 , DOI: 10.1080/00221686.2019.1647885
Meriem Chetibi 1 , Sebastien Proust 2 , Saadia Benmamar 3
Affiliation  

Steady uniform and non-uniform flows through an array of emergent and slightly submerged square cylinders are experimentally investigated with a specific focus on transverse seiche waves induced by vortex shedding. The study is first and foremost aimed at assessing the effect of streamwise flow non-uniformity on seiche waves. Its secondary purpose is to investigate the change in seiche magnitude, when initially emerged cylinders become slightly submerged. Thirdly and lastly, the effect of seiche waves on mean velocities and velocity fluctuations is quantified. The lock-in process between waves and vortex shedding is unaltered by flow non-uniformity and by a change from cylinder emergence to submergence. For non-uniform flows, this results in the co-existence of two differently oscillating transverse waves close to each other. Relative wave amplitude is found to be mainly influenced by relative submergence in the case of submerged cylinders, and by Froude number and oscillation mode in the case of emergent cylinders. Finally, seiche waves modify the streamwise mean velocity, when cylinders are emergent.

中文翻译:

稳定均匀和非均匀流动的横向表面波通过一系列突现的和略微淹没的方柱

实验研究了稳定的均匀和非均匀流通过一系列突现和轻微淹没的方形圆柱体,特别关注由涡旋脱落引起的横向 seiche 波。该研究的首要目的是评估流向流动的非均匀性对塞切波的影响。其次要目的是研究当最初出现的圆柱体稍微浸入水中时,地震震级的变化。第三也是最后,量化了seiche波对平均速度和速度波动的影响。波浪和涡旋脱落之间的锁定过程不会因流动不均匀性和从圆柱体出现到淹没的变化而改变。对于非均匀流动,这会导致两个彼此靠近的不同振荡横波共存。发现相对波幅在沉水圆柱体的情况下主要受相对沉没度的影响,在浮水圆柱体的情况下主要受弗劳德数和振荡模式的影响。最后,当圆柱体出现时,塞切波会修改流向平均速度。
更新日期:2019-10-30
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