Particle Image Velocimetry Measurements of the Flow over Barnacles in a Turbulent Boundary Layer
Particle Image Velocimetry Measurements of the Flow over Barnacles in a Turbulent Boundary Layer
复制标题
湍流边界层中藤壶流过的粒子图像测速测量
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Schultz
中科院分区：
文献类型：
--
作者：
J. Barros;E. Murphy;M. Schultz
藤壶是一种在咸水中发现的悬浮式摄食甲壳类动物。这些污垢微生物可以在海洋船舶的船体上生长，从而对其性能产生重大影响。藤壶的存在极大地增加了摩擦阻力，因此产生了严重的负面经济影响。高分辨率PIV被用来测量浸没在湍流边界层中的藤壶的流动。研究了两种构型：i)单藤壶构型和ii)规则交错排列的藤壶。当可视化单个元素周围的流动时，这两种构型之间的平均流量惊人地相似。象限分析揭示了重要的结构行为，特别是当只考虑最强的雷诺剪切应力事件时。这些事件可能与幼虫定居和废物清除有关。图1左图说明了藤壶的排列。中图和右图分别显示了单个藤壶和藤壶阵列布局的平均速度场，其中顶部显示流向速度，底部显示壁法向速度。
Barnacles are suspension-feeding crustaceans found in saline waters. These fouling organisms can grow on the hull of marine ships, thus having a significant impact on their performance. The presence of barnacles dramatically increases the frictional drag and consequently has drastic negative economic implications. High-resolution PIV is used to measure the flow over barnacles immersed into a turbulent boundary layer. Two configurations were investigated i) single-barnacle configuration and ii) a regular, staggered array of barnacles. Mean flow quantities between these two configurations are strikingly similar when visualizing the flow around an individual element. Quadrant analysis revealed important structural behavior, especially when only considering the strongest Reynolds Shear Stress events. These events are likely linked to contribute to both larval settlement and waste removal. Fig. 1 Left panel illustrate the barnacle arrangement. Center and right panels show the mean velocity fields for single-barnacle and barnacle array configuration, respectively, where the top shows the streamwise velocity and the bottom the wall-normal velocity.