In the present study, a 2-ton class seaweed harvesting boat was optimized by employing a W-shape hull form to reduce roll motion due to wake-wash from passing boats. A series of numerical simulations were conducted using Star-CCM+, a commercial CFD (computational fluid dynamics) software, to improve workability by optimizing the hull form from the conventional design (original hull form). The 2-dimensional roll decay motion of various hull forms with W-shape midsection were simulated and the hull form with the best performance in free roll decay test was selected. To evaluate stability of each hull in wake-wash, the original or optimized hull was alternately located at the middle of a computational domain as a target ship while an advancing ship (original hull) moved forward generating Kelvin waves which impact the original or optimized boat. Two kinds of working conditions, i.e., ballast and full loading conditions, of the target ship were considered with and without initial roll angle. It was observed through the comparison of motion between the original and optimized hulls a decrement of roll motion for the optimized ship demonstrating the effectiveness of the W-shape hull. Decrement of roll motion was observed for both working conditions. Additionally, the optimized W-shape hull showed an extraordinary performance under the ballast condition without initial roll angle.

中文翻译：

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海水洗涤导致海藻收获船可工作性的CFD模拟

在本研究中，通过采用W形船体形式来优化2吨级海藻收获船，以减少由于过往船尾冲水而引起的侧倾运动。使用商用CFD（计算流体动力学）软件Star-CCM +进行了一系列数值模拟，以通过优化常规设计（原始船体形式）的船体形式来提高可加工性。模拟了具有W型中间截面的各种船体形式的二维侧倾衰减运动，并选择了在自由侧倾衰减试验中性能最佳的船体形式。为了评估尾流冲洗过程中每个船体的稳定性，原始船体或优化船体交替位于计算域的中间作为目标船，而前进船（原始船体）向前移动，产生开尔文波，从而影响原始船体或优化船。考虑和不考虑初始侧倾角时，目标船的两种工作条件，即压载和满载条件。通过比较原始船体和优化船体之间的运动，可以观察到优化船体的横摇运动减小，证明了W形船体的有效性。在两种工作条件下均观察到侧倾运动的减少。此外，优化的W形船体在压载条件下没有初始侧倾角时也表现出非凡的性能。通过比较原始船体和优化船体之间的运动，可以观察到优化船体的横摇运动减小，证明了W形船体的有效性。在两种工作条件下均观察到侧倾运动的减少。此外，优化的W形船体在压载条件下没有初始侧倾角时也表现出非凡的性能。通过比较原始船体和优化船体的运动，可以观察到优化船体的横摇运动减小，证明了W形船体的有效性。在两种工作条件下均观察到侧倾运动的减少。此外，优化的W形船体在压载条件下没有初始侧倾角时也表现出非凡的性能。