HAMS: A Frequency-Domain Preprocessor for Wave-Structure Interactions—Theory, Development, and Application
HAMS: A Frequency-Domain Preprocessor for Wave-Structure Interactions—Theory, Development, and Application
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DOI：
10.3390/jmse7030081
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发表时间：
2019-03
影响因子：
2.9
通讯作者：
Yingyi Liu
中科院分区：
文献类型：
--
作者：
Yingyi Liu
本文介绍了一个新的软件，近年来已开发的波浪-结构相互作用的分析的理论背景，数值实现和应用。该软件是在频域中开发的，作为计算波激振力、附加质量和波辐射阻尼的预处理器，用于通过傅立叶余弦和正弦变换输入到时域求解器。此外，它还可以预测的运动响应的海洋结构物具有足够的精度，有或没有系泊系统的存在。与其他频域软件（例如WAMIT®和Hydrostar®）不同，本软件目前采用与部分扩展边界积分方程方法相关联的最小二乘法来去除所谓的“不规则频率”。自由表面绿色函数的计算采用了不同参数子区域的快速收敛级数展开的组合。所得到的线性代数系统的解决方案采用下-上（LU）分解方法。可以利用对称性，并且可以应用开放式多处理（OpenMP）并行化技术来减少计算负担。最后通过对浮式椭圆体基准算例和OC 4 DeepCwind半潜式浮式风力涡轮机的实际运行验证了所开发软件的准确性和有效性。该软件的免费可执行版本可供研究界使用，希望促进与海洋工程和海洋可再生能源相关的研究的进步。
This paper presents the theoretical background, the numerical implementation, and the applications of a new software that has been developed in recent years for the analysis of wave-structure interactions. The software is developed in the frequency domain, as a preprocessor of computing the wave excitation force, the added mass, and the wave radiation damping, for input to a time-domain solver via the Fourier cosine and sine transforms. In addition, it can also predict the motion responses of a marine structure with sufficient accuracy, with or without the presence of the mooring system. Unlike other frequency-domain software, such as WAMIT® and Hydrostar®, the present software currently employs the least squares method in association with a partially extended boundary integral equation method to remove the so-called “irregular frequencies”. Calculation of the free-surface Green’s function employs a combination of fast-convergent series expansions in different parametric sub-regions. The solution of the resultant linear algebraic system employs the lower-upper (LU) decomposition method. Symmetry properties can be exploited, and the open multi-processing (OpenMP) parallelization technique can be applied to reduce the computation burden. The accuracy and the efficiency of the developed software are finally confirmed by numerical validations on a floating ellipsoid benchmark case and the OC4 DeepCwind semisubmersible floating wind turbine in practice. A free executable version of the software is available to the research communities with the hope of facilitating advancements in the researches that are relevant to ocean engineering and marine renewable energies.