Abst'/> Enhancement of asymptotic formula for added resistance of ships in short waves
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Enhancement of asymptotic formula for added resistance of ships in short waves

机译：渐近公式的增强，增加了短波船的抵抗力

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AbstractThis paper introduces a practical formula for added resistance in short waves. Particularly, the formulation introduced by Faltinsen et al. (1980) is modified to consider the three aspects: the finite draught of ships, the local steady velocity, and the shape above still-water-level (SWL). First, an additional term due to the finite draught of ships is derived by subtracting the integration of velocity square terms along the vertical control surface from the ships draught to the negative infinite. Second, a new local steady velocity is proposed, which includes the variation of sectional area. Third, the bow shape above SWL is considered by introducing the ratio of bluntness coefficients at the mean level of steady waves and SWL. The mean level of steady waves is approximately calculated based on the steady wave elevation of an advancing wedge-shaped body in calm water. The effect of each modification has been investigated and compared to experimental results and other empirical formulae of added resistance in short waves. Finally, a practical approach to combine the modified formula and the existing computation method for the added resistance in an overall wavelength range is presented.Highlights•A new formula for added resistance in short waves is introduced.•The existing asymptotic formula is revised for diffraction problem.•The pressure integral is carried out up to the ship draft.•Speed of steady flow around ship bow is corrected.•The effect of steady wave elevation near bow is considered.
机译： 摘要 本文介绍了一种增加短波电阻的实用公式。特别是Faltinsen等人介绍的配方。 （1980）进行了修改，以考虑三个方面：船舶的吃水，局部稳定速度和静止水位以上的形状（SWL）。首先，通过从船吃水到负无穷大减去沿垂直控制面的速度平方项的积分，得出船吃水有限的附加项。其次，提出了一种新的局部稳态速度，其中包括截面积的变化。第三，通过引入稳态波和SWL平均水平的钝度系数之比来考虑SWL上方的弓形。根据在平静水中前进的楔形物体的稳定波高程，近似计算稳定波的平均水平。已经研究了每种修改的效果，并将其与实验结果和短波附加电阻的其他经验公式进行了比较。最后，提出了一种将修正公式与现有计算方法相结合的实用方法，用于在整个波长范围内增加电阻。 < ce：abstract xmlns：ce =“ http://www.elsevier.com/xml/common/dtd” xmlns =“ http://www.elsevier.com/xml/ja/dtd” class =“ author-highlights” xml：lang =“ zh_cn id =” abs0015“ view =” all“> 突出显示 • 引入了一个新的公式，以增加短波阻力。 • 针对衍射问题修改了现有的渐近公式。 • 压力积分 • 船首周围稳定流的速度已得到纠正。 • 考虑了弓附近稳定波仰角的影响。

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