Computation of wet deck bow slam loads for catamaran arched cross sections
Computation of wet deck bow slam loads for catamaran arched cross sections
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DOI：
10.1016/j.oceaneng.2007.06.001
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发表时间：
2007-12
影响因子：
5
通讯作者：
M. Davis;J. Whelan
中科院分区：
文献类型：
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作者：
M. Davis;J. Whelan
基于船体入水时附加质量的变化，建立了双体船湿甲板撞击的计算模型。在穿波双体船中，船首横截面具有双拱横截面，当拱填充时发生撞击。由于湍流混合形成的气泡，残余空气被夹带在拱形顶部，这改变了水对船体增加质量的影响。因此，计算模型引入了与撞击和船体相关的水附加质量之间的软连接。通过与二维模型跌落试验的比较，对该方法进行了评估，包括船体上施加的最大力和加速度、撞击事件时速度的变化以及入水深度。结论是，增加的质量计算足以用于整体运动和载荷计算中的冲击建模，因为它能很好地表示截面上的最大总力及其持续时间。
A computational model for catamaran wet deck slamming is developed on the basis of the variation of added mass as the hulls enter the water. In the case of a wave-piercing catamaran the bow cross section has a double arch cross section and slamming occurs when the arches fill. Residual air is entrained at the top of the arch due to bubble formation by turbulent mixing and this modifies the effect of the water added mass on the hull. The computational model therefore introduces a soft connection between the water added mass associated with the slam and the hull. The method has been evaluated by comparison with two-dimensional model drop tests in terms of the maximum forces and acceleration imposed on the hull, the variation of velocity during the slam event and the depth of penetration into the water. It is concluded that the added mass computation is adequate for slam modelling in global motions and loads calculations since it gives a good representation of the maximum total forces on the section and their duration.