Experimental investigation and analysis of hydrodynamic characteristics of a net panel oscillating in water

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• 作者：Lili Liu^a ; ^b ; Takeshi Kinoshita^b ; Rong Wan^a ; ^{rongwan@ouc.edu.cn} ; Weiguang Bao^b ; Hiroshi Itakura^b
• 关键词：Hydrodynamic load ; Forced oscillation ; Dynamic simulation ; Drag coefficient ; Inertia coefficient
• 刊名：Ocean Engineering
• 出版年：2012
• 期刊代码：133_00298018
• 类别：et
• 出版时间：June, 2012
• 卷：47
• 期：Complete
• 页码：19-29
• 文件大小：1996 K

摘要

To investigate the behaviour and hydrodynamic characteristics of supple nets in a wave, experiments of forced oscillation were conducted in a tank with square net panels. The four corners of the net panel were fixed to the oscillation device with a specific pretension. The hydrodynamic loads acting on the corners of the netting were measured. To simulate the experiments, a numerical model based on dynamic finite element analysis was constructed. Comparing the amplitude and phase of measured loads with the calculated results, the drag coefficient C_d and inertia coefficient C_m were determined by interpolation and iteration. The effects of various parameters on C_d and C_m were investigated. The results show that: (1) drag force is dominant at low frequency, whereas the contribution of inertia force increases with an increase of the Keulegan-Carpenter number or frequency; (2) with increasing frequency, both C_d and C_m show a decreasing trend, and the trend of C_d against the Reynolds number is similar to that in steady flow; (3) increasing oscillation amplitude makes C_d decrease, but it has no significant effect on C_m; (4) solidity generally has a positive effect on C_d and C_m.