使用Fluent模拟风浪流联合发电装置的水动力特性。利用UDF和动网格技术实现圆柱振子的流固耦合模拟,分析圆柱振子的涡激振动特性。首先,从受力、运动频率、幅值、轨迹、升阻力系数等5个方面分析风浪流联合发电装置圆柱振子的涡激振动特性;其次,通过对圆柱绕流、强迫运动、单向涡激振动、双向涡激振动等多种运动形态的对比,研究风浪流联合发电装置圆柱振子的涡泄模式。最后通过与J&W的经典实验对比,证明该模拟的准确性。研究表明：单向涡激振动时,振子阻力系数的平均值和均方差均呈先增加后减少的趋势,且在约化速度为5.53~9.51时发生锁定现象;与圆柱振子绕流相比,单向涡激振动的频率比随约化速度的增加而增大,且在锁定区间保持稳定,约为1;来流速度选取锁定区间内流速时,单向或双向涡激振动的尾涡形式由2S模式转变为SS模式。
Abstract
This paper employs Fluent to simulate the hydrodynamic characteristics of the Wind, Wave, and Tidal Power Generation Device. The fluid-structure interaction simulation of a circular cylinder oscillator is achieved through the use of User-Defined Functions （UDFs） and dynamic mesh technology for analyzing the characteristics of vortex-induced vibration（VIV） of the circular cylinder oscillator. The VIV characteristics of the circular cylinder oscillator in the Wind, Wave, and Tidal Power Generation Device are analyzed from five aspects： forces, motion frequency, amplitude, trajectory, and lift-to-drag ratio. Furthermore, by comparing various motion patterns such as cylinder flow, forced motion, unidirectional vortex-induced vibration, and bidirectional vortex-induced vibration, the vortex shedding modes of the circular cylinder oscillator in the Wind, Wave, and Tidal Power Generation Device are studied. Finally, through a comparison with the classic experiment conducted by J&W, the accuracy of the simulation is validated. The research indicates that during single-direction vortex-induced vibrations, both the average value and the standard deviation of the drag coefficient of the oscillator first increase and then decrease. Lock-in occurs in the reduced velocity range of approximately 5.53 to 9.51. Compared to the flow around a cylindrical oscillator, the frequency ratio of single-direction vortex-induced vibrations increases with the reduced velocity and remains stable at approximately 1 within the lock-in range. When the flow velocity is selected within the lock-in range, the tail vortex mode for either single-direction or bidirectional vortex-induced vibrations changes from the 2S mode to the SS mode.
关键词
海流能 /
涡激振动 /
流固耦合 /
涡泄模式 /
约化速度 /
数值模拟
Key words
ocean current energy /
fluid structure interaction /
vortex-induced vibration /
vortex shedding mode /
reduced velocity /
numerical simulation
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