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Viscous Damping Identification for a Wave Energy Converter Using CFD-URANS Simulations
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2020-05-17 , DOI: 10.3390/jmse8050355
Marco Fontana , Pietro Casalone , Sergej Antonello Sirigu , Giuseppe Giorgi , Giovanni Bracco , Giuliana Mattiazzo

During the optimization phase of a wave energy converter (WEC), it is essential to be able to rely on a model that is both fast and accurate. In this regard, Computational Fluid Dynamic (CFD) with Reynolds Averaged Navier–Stokes (RANS) approach is not suitable for optimization studies, given its computational cost, while methods based on potential theory are fast but not accurate enough. A good compromise can be found in boundary element methods (BEMs), based on potential theory, with the addition of non-linearities. This paper deals with the identification of viscous parameters to account for such non-linearities, based on CFD-Unsteady RANS (URANS) analysis. The work proposes two different methodologies to identify the viscous damping along the rotational degree of freedom (DOF) of pitch and roll: The first solely involves the outcomes of the CFD simulations, computing the viscous damping coefficients through the logarithmic decrement method, the second approach solves the Cummins’ equation of motion, via a Runge-Kutta scheme, selecting the damping coefficients that minimize the difference with CFD time series. The viscous damping is mostly linear for pitch and quadratic for roll, given the shape of the WEC analysed.

中文翻译:

使用CFD-URANS仿真的波能转换器粘性阻尼识别

在波能转换器(WEC)的优化阶段,至关重要的是能够依靠快速而准确的模型。在这方面,考虑到其计算成本,采用雷诺平均纳维–斯托克斯(RANS)方法的计算流体动力学(CFD)不适合用于优化研究,而基于势能理论的方法虽然快速但不够准确。在边界元方法(BEM)中,基于势能理论,加上非线性因素,可以找到一个很好的折衷方法。本文基于CFD非稳态RANS(URANS)分析,处理粘性参数以解决此类非线性问题。这项工作提出了两种不同的方法来确定俯仰和横滚旋转自由度(DOF)上的粘性阻尼:第一种方法仅涉及CFD模拟的结果,通过对数递减法计算粘性阻尼系数,第二种方法通过Runge-Kutta方案求解康明斯运动方程,选择使CFD差异最小的阻尼系数时间序列。给定所分析的WEC的形状,粘性阻尼对于俯仰几乎是线性的,对于滚动来说则是二次的。
更新日期:2020-05-17
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