The planing trimaran is a novel kind of aerodynamic alleviated marine vehicle and possesses a unique hybrid hydrodynamic and aerodynamic characteristics. In this paper, to investigate the hull behavior of a planing trimaran under the effect of tunnel forces, the tunnel and demihull are treated as appendages mounted on the slender main hull. Numerical simulations were carried out for planing trimaran and a monohull which was built according to the main hull configuration. Mesh convergence studies were implemented based on the public experimental data of a similar planing trimaran. Calculated results show that the presence of tunnel and demihull could decrease the resistance of the main hull and improve the longitudinal motion stability at high speeds. Flow evolutions of waves, velocity vector, wetted length and lift distribution were performed to explain the variation of the tunnel lift and its moment and their influence on hull behavior. Parameter studies on demihull length were carried out as well. It was found that, as the demihull length is increased, the tunnel trimming moment would decrease especially in the final stage of ventilation, making resistance reduced but the motion stability weakened.

中文翻译：

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高速滑行三体船阻力和纵向运动稳定性的数值研究

滑行三体船是一种新型的空气动力学缓解型海洋飞行器，具有独特的流体动力和空气动力混合特性。在本文中，为了研究滑行三体船在隧道力的作用下的船体行为，将隧道和消灭船体视为安装在细长主船体上的附件。对三体船和根据主要船体结构建造的单体船进行了数值模拟。网格收敛研究是基于类似平面三体船的公开实验数据进行的。计算结果表明，隧道和反舰船身的存在可以降低主船体的阻力，并提高高速时的纵向运动稳定性。波的流演化，速度矢量，用湿润长度和升力分布来解释隧道升力及其力矩的变化及其对船体性能的影响。还进行了关于船身长度的参数研究。结果发现，随着排气管长度的增加，隧道修整力矩将减小，尤其是在通风的最后阶段，阻力减小但运动稳定性减弱。