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A new phenomenon in interference effect on catamaran dynamic response
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ijmecsci.2020.106041
Amir Honaryar , Mahmoud Ghiasi , Pengfei Liu , Arash Honaryar

Abstract Interference effect between catamaran demi-hulls has been considered as an adverse fluid-solid interaction; the narrower separation distance between the two hulls, the greater drag force acts upon the catamaran. However, this study is aimed at introducing a novel phenomenon contrasting outcome in semi-planing and planing regimes. As speed and accordingly the Froude number increase the catamaran transits across different modes, free surface profile becomes complicated and so does the interference effect as well as the prediction of catamaran dynamic response. The situation will be even more complex if demi-hull separation narrows where nonlinearity in interference effect is more pronounced. So, free-running tests in six degrees of freedom as well as obtaining fluid flow characteristics using computational fluid dynamics were conducted for a high-speed catamaran vehicle with asymmetric non-prismatic demi-hulls to tackle the problem. The results of catamaran dynamic response reveal that not only is drag reduced substantially up to 15%, but also trim angle diminishes by 30% as hulls separation distance decreases in semi-planing and planing modes. In other words, with increasing speed, and decreasing trim angle by 2.3o, the current method achieved the goal of consequently reducing the risk of porpoising instability, without the increase of delivered power.

中文翻译:

双体船动力响应干扰效应的一种新现象

摘要 双体船半船体之间的干扰效应被认为是一种不利的流固相互作用;两个船体之间的间隔距离越小,作用在双体船上的阻力就越大。然而,这项研究的目的是在半刨削和刨削制度中引入一种新的现象对比结果。随着速度和相应的 Froude 数增加双体船在不同模式之间的过渡,自由表面轮廓变得复杂,干扰效应以及双体船动态响应的预测也变得复杂。如果半船体间隔变窄,干扰效应的非线性更加明显,情况将更加复杂。所以,对具有非对称非棱柱半船体的高速双体船进行了六个自由度的自由运行测试以及使用计算流体动力学获得流体流动特性以解决该问题。双体船动力响应的结果表明,在半滑行和滑行模式下,随着船体间距的减小,不仅阻力显着降低了 15%,而且纵倾角也减小了 30%。换句话说,随着速度的增加,纵倾角减小 2.3o,当前的方法实现了降低海豚不稳定风险的目标,而不会增加输出功率。双体船动力响应的结果表明,在半滑行和滑行模式下,随着船体间距的减小,不仅阻力显着降低了 15%,而且纵倾角也减小了 30%。换句话说,随着速度的增加,纵倾角减小 2.3o,当前的方法实现了降低海豚不稳定风险的目标,而不会增加输出功率。双体船动力响应的结果表明,在半滑行和滑行模式下,随着船体间距的减小,不仅阻力显着降低了15%,而且纵倾角也减小了30%。换句话说,随着速度的增加,纵倾角减小 2.3o,当前的方法实现了降低海豚不稳定风险的目标,而不会增加输出功率。
更新日期:2021-01-01
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