Modeling wave and spectral characteristics of moored ship motion in Pohang New Harbor under the resonance conditions
Modeling wave and spectral characteristics of moored ship motion in Pohang New Harbor under the resonance conditions
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DOI：
10.1016/j.oceaneng.2016.04.027
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发表时间：
2016-06
影响因子：
5
通讯作者：
Prashant Kumar;Huai Zhang;K. Kim;D. Yuen
中科院分区：
文献类型：
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作者：
Prashant Kumar;Huai Zhang;K. Kim;D. Yuen
建立了一个综合数学模型，研究了在入射海浪的衍射、折射和部分反射作用下，系泊船舶在不规则几何域中运动的波浪和光谱特征。假设部分反射边界的入射角为零。流体域分为三个区域：有界区域（港口）、无界区域（公海）和船舶区域。采用船舶区域的三维边界元法和有界区域的二维边界元法相结合的数值方法分析了共振条件下系泊船舶的运动。我们提出的模型与现有的知名模型（如Sawaragi et al.（1989）和Takagi et al.(1993)）进行了验证，表明它可以有效地捕获波浪的频谱。然后，将所提出的数值方案应用于位于韩国东南部的浦项新港。得到了不同方向入射波和共振频率下系泊船舶运动的频谱特性。可靠的计算结果表明，该方法可用于具有复杂几何形状（包括尖角）的现实港口中系泊船舶的安全与减灾。
An integrated mathematical model is demonstrated to investigate the wave and spectral characteristics of the moored ship motion in an irregular geometrical domain due to diffraction, refraction, and partial reflection induced by incident ocean waves. The incidence angle of partial reflection boundary is assumed as zero. Fluid domain is divided into three regions entitled as bounded region (harbor), unbounded region (open sea), and ship region. A combined numerical approach including 3-D Boundary Element Method (BEM) in the ship region and a 2-D BEM in bounded region is performed to analyze the moored ship motion under the resonance conditions. Our proposed model is validated with existing well-known models, such as Sawaragi et al. (1989) and Takagi et al. (1993), revealing that it could efficiently capture the spectrum of waves. Then, the proposed numerical scheme is implemented in realistic Pohang New Harbor, which is situated in the southeast part of South Korea. The spectral characteristics of a moored ship motion are obtained under different directional incident waves with resonant frequencies. The reliable calculation results suggest that this method can be utilized for the safety and hazard mitigation of the moored ship in realistic harbor with complex geometry including sharp corners.