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超细长三体船耐波性试验研究 总被引：9，自引：0，他引：9
通过三体船模型耐波性试验,包括横摇试验,规则波中的迎浪试验,研究了侧体布置位置和舭龙骨对三体船横摇运动的影响以及在波浪中的纵摇和垂荡运动特点。 相似文献
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基于BP神经网络的变形三体船布局优化研究 总被引：1，自引：0，他引：1
针对以DTMB5415为基础船型提出的高速可变形三体船,以CFD软件计算结果为样本值,利用BP神经网络方法对三体船静水阻力进行多次训练,在保证精度的基础上模拟预测了多组不同航速、不同布局下的单位排水量阻力值,从而得出了随航速变化下该船型可调节的适航布局。BP神经网络法较之传统CFD计算不仅能极大的缩短计算时间,而且能快速可靠的搜索到任意航速下能耗最小的布局,打破了CFD方法必须通过限定布局和航速求得阻力值来进行比较的固有模式,真正实现了三体船"可变形"的优势,工程适用性强,为计算机辅助三体船布局优化研究提供了一种新思路。 相似文献
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The planing trimaran possesses distinctive hybrid hydrodynamic and aerodynamic performance due to the presence of tunnel. The research described in this paper was carried out based on the observation of wave characteristics of a planing trimaran model in towing tests, in which the resistance drops as soon as the wave surface separates from tunnel roof. In order to gain a deeper insight into the relationship between wave flow and forces in tunnel region, a comprehensive series of viscous CFD simulations considering free-surface and 2-DOF motion of the hull (heave and pitch) have been performed for the tested model at the volume based Froude numbers ranging from 3.16 to 5.87. The calculated results were validated by comparison with experimental data and showed good agreement. Numerical results of wave contours, longitudinal wave cuts and lifting force distributions at the calculated speeds were presented for the analysis of ventilation process in tunnel region and the corresponding variation of tunnel forces. It is found that, for the speeds higher than Froude number of 4.52, the aerodynamic forces provide major tunnel lift and mainly act on the straight section of the tunnel. And, therefore, numerical simulations of two modified models have also been performed for the analysis of influence of straight section length on the hydrodynamic and aerodynamic performance of planing trimaran. 相似文献
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三体船的水动力性能是目前水动力学研究的热门。对于中高速三体船来说,其静水阻力的很大一部分由兴波阻力构成,而对于兴波最大的影响因素就是片体位置的布局。以一艘圆舭型三体船为研究对象,运用黏流计算流体力学(CFD)方法模拟分析4种不同片体位置对三体船静水阻力和兴波干扰的影响。数值计算采用自主研发的黏流CFD求解器naoe-FOAM-SJTU。数值预报得到三体船静水阻力结果与模型试验结果吻合较好,验证了当前CFD方法预报三体船阻力的可靠性。通过不同片体位置三体船阻力计算发现,方案4的船型方案阻力最优,且通过细节的主片体间兴波干扰流场的结果给出了不同片体布置方案对三体船阻力和兴波的影响。 相似文献
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