Modeling of pulsating incoming flow using vortex particle methods to investigate the performance of flutter-based energy harvesters
Modeling of pulsating incoming flow using vortex particle methods to investigate the performance of flutter-based energy harvesters
复制标题
使用涡旋粒子法对脉动传入流进行建模，以研究基于颤振的能量收集器的性能
DOI：
10.1016/j.compstruc.2018.08.008
复制
发表时间：
2018
影响因子：
4.7
通讯作者：
Morgenthal
中科院分区：
文献类型：
--
作者：
Chawdhury;Milani;Morgenthal
本文提出了一种数值技术的框架内的二维涡粒子方法来模拟脉动流的种子预先计算的涡粒子到自由流。感兴趣的是调查小规模的颤振为基础的能量采集器的性能，特别是在低频周期性的传入流。建议的数值扩展利用自然对流的颗粒，定期播种从两个遥远的播种点附近的上游边界。的播种机制和粒子的方向进行处理，使它们只引起水平的速度分量的域中心周围，而垂直分量几乎被抵消。正弦周期性流动是通过播种不同的强度和方向的颗粒，相应地模拟。收敛性研究进行验证计划。对建模的周期性流的质量进行评估和量化。最后，研究了一个参考T型收割机在稳定和周期性来流下的动态运动。在周期性来流的情况下，观察到不稳定颤振响应的开始较早。极限环振荡的响应幅度和模式被发现是依赖于周期性流的频率和强度的组合。
The paper presents a numerical technique within the framework of two-dimensional Vortex Particle Methods to simulate pulsating flow by seeding pre-calculated vortex particles into the free stream flow. The interest is to investigate the performance of small-scale flutter-based energy harvesters, particularly under low-frequency periodic incoming flows. The proposed numerical extension utilizes the natural convection of the particles, regularly seeded from two distant seeding points near the upstream boundary. The seeding mechanism and the orientation of the particles are handled such that they induce only horizontal velocity components around the domain center while the vertical components are nearly canceled out. The sinusoidal periodic flow is modeled by seeding the particles of varied strength and orientation, correspondingly. Convergence studies are performed to validate the scheme. The quality of the modeled periodic flows is assessed and quantified. Finally, the studies are carried out to investigate the dynamic motion of a reference T-shaped harvester under steady and periodic incoming flows. The initiation of unstable flutter response is observed earlier in case of periodic incoming flows. The response amplitude and the pattern of limit cycle oscillations are found to be depending on the combination of frequency and intensity of the periodic flow.
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