柔性圆柱结构动力学对近尾流湍流的影响

IF 1.8 Q3 MECHANICS Fluids Pub Date : 2023-10-01 DOI:10.3390/fluids8100270
Sharul Sham Dol, Siaw Khur Wee, Tshun Howe Yong, Shaharin Anwar Sulaiman
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引用次数: 0

摘要

利用刚性和突出的表面,再加上搅拌器和涡流发生器,通常会导致能量耗散大于满足要求标准的湍流产生。相比之下,被动振荡的柔性凸出表面可以产生更大的湍流水平。在目前的研究中,使用一个有限圆柱(悬臂)作为刚性和突出表面的几何形状。材料和纵横比都有变化。亚临界流动范围内的局部雷诺数(102 <红色& lt;105)被考虑过。刚性凸出面(有限圆柱)的结果可以作为已发表结果的验证,也可以作为改进柔性凸出面的湍流的基准。通过对湍流强度、湍流产生项和雷诺数应力的研究,进一步证明了柔性圆柱体能够产生更大的湍流。所有振动的柔性气缸都显示出湍流产生的增加,但百分比不同。在这项工作中研究的气缸范围从最低结构刚度(EVA)到中等结构刚度(铝)和最高结构刚度(碳钢)。通过对柔性圆柱的归一化振幅响应图的研究,发现振荡运动确实对增量有贡献。进一步检验结果表明,增加是由于结构速度,而不仅仅是振荡运动。
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The Effects of Flexible Cylinder Structural Dynamics to the near Wake Turbulence
The utilization of a rigid and projecting surface, coupled with an agitator and vortex generator, frequently results in the dissipation of more energy than the production of turbulence that meets the required criteria. By contrast, a passively oscillating flexible protruding surface can generate a greater turbulence level. In the current study, a circular finite cylinder (cantilever) was used as the geometry of the rigid and protruding surface. Both the material and the aspect ratio were varied. Also, a local Reynolds number within the subcritical flow range (102 < ReD < 105) was considered. The results from the rigid protruding surface (finite cylinder) serve as a validation of the published results and a benchmark for the improvement of the turbulence generated by the flexible protruding surface. The results obtained via an ultrasonic velocity profiler have further demonstrated that the flexible cylinder is capable of generating greater turbulence by examining the turbulence intensity, the turbulence production term and the Reynolds stress. All the flexible cylinders that oscillate show an increase in turbulence production but at different percentages. The cylinders studied in this work ranged from the least structural stiffness (EVA) to moderate (aluminum) and the highest structural stiffness (carbon steel). Through studying the normalized amplitude responses graph for the flexible cylinders, it is found that the oscillating motion does indeed contribute to the increment. A further examination of the results shows that the increase is due to the structural velocity instead of just the oscillating motion.
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来源期刊
Fluids
Fluids Engineering-Mechanical Engineering
CiteScore
3.40
自引率
10.50%
发文量
326
审稿时长
12 weeks
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