Application of a fictitious domain method in numerical simulation of an oscillating wave surge converter
Application of a fictitious domain method in numerical simulation of an oscillating wave surge converter
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DOI：
10.1016/j.renene.2018.01.021
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发表时间：
2018-06
期刊：
影响因子：
8.7
通讯作者：
H. R. Mottahedi;M. Anbarsooz;M. Passandideh-Fard
中科院分区：
文献类型：
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作者：
H. R. Mottahedi;M. Anbarsooz;M. Passandideh-Fard
近年来，包括势流理论和计算流体力学（CFD）方法在内的几种数值方法被用于预测振荡波涌变流器（OWSCs）的水动力性能。在CFD方法中，为了考虑OWSC在流体内部的运动，通常使用动态网格，这是一种计算成本高且麻烦的方法。本文在固定欧拉网格框架内，结合流体体积法，提出了一种快速虚拟域（FFD）方法。用该方法模拟了在包括撞击在内的各种入射条件下，OWSC与完全非线性陡波的相互作用。通过对二维撞击事件的数值计算结果与文献中已有的实验数据进行比较，验证了所提模型的准确性。该模型还用于研究动力起飞（PTO）阻尼系数对OWSC捕获因子、撞击特性和铰链力的影响。结果表明，与适当调整PTO阻尼力的OWSC相比，自由运动的OWSC可能承受更大的铰链力。此外，随着波高的增加，最大捕获因子出现在PTO阻尼系数较高的值。
In recent years, several numerical methods, including potential flow theory and Computational Fluid Dynamics (CFD) methods, have been employed to predict the hydrodynamic performance of Oscillating Wave Surge Converters (OWSCs). In the CFD methods, in order to consider the motions of the OWSC inside the fluid, a dynamic mesh is commonly used which is computationally expensive and troublesome. In this paper, a fast fictitious domain (FFD) method in conjunction with the Volume-Of-Fluid (VOF) method is proposed, within the frame of a fixed Eulerian grid. The method is used to simulate the fully-nonlinear steep wave interactions with an OWSC at various incident conditions, including the slamming. The accuracy of the proposed model is examined by comparing the numerical results with the available experimental data in the literature for a two-dimensional slamming event. The model is also used to investigate the effects of the Power-Take-Off (PTO) damping coefficient on the OWSC capture factor, slamming characteristics and hinge forces. Results show that a freely moving OWSC, might experience considerably higher hinge forces in comparison with an OWSC having a suitably adjusted PTO damping force. Furthermore, as the wave height increases, the maximum capture factors occur at higher values of the PTO damping coefficient.