期刊
JOURNAL OF FLUIDS AND STRUCTURES
卷 124, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jfluidstructs.2023.104026
关键词
Bluff body; Flow control; Vortex shedding; Control rods; Multi-objective genetic algorithm
This paper presents an experimental study of fluid-structure interaction, demonstrating that the controlled rotation of rods can reduce mean drag and fluctuating lift forces simultaneously. By using a multi-objective genetic algorithm, the optimum rotation speeds were found, resulting in a more significant reduction in objectives and energy consumption. The contribution of each rod depends on its angular position and the flow conditions generated by the upstream control rods. The study clarifies the physical principles of the phenomenon and paves the way for technological applications.
This paper presents an experimental study of fluid-structure interaction conducted at Reynolds numbers around 104 with scale models in a water channel. A circular cylinder was equipped with eight control rods positioned around its perimeter to interact with the external flow. Each rod could be driven independently to rotate about its axis. The controlled rotation of the rods interfered with the vortex generation mechanism mitigating the formation of a coherent wake. The results showed that it is possible to simultaneously reduce the mean drag and fluctuating lift forces when the rods rotate at a uniform speed or with each rod set at a different rate. A multi-objective genetic algorithm was employed to find the optimum rotation speeds. The optimum rotation produced a more significant reduction in both objectives and also consumed less energy. The contribution of each rod depends significantly on its angular position around the body and the flow conditions resulting from the upstream control rods. The present work clarifies the physical principles of the phenomenon and paves the way for the development of technological applications.
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