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Numerical prediction of roll damping of ships with and without bilge keel

机译：用舱底龙骨滚动卷筒阻尼的数值预测

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摘要

Estimation of roll damping of ships from free roll decay experiments or using appropriate semi-empirical formulae is a common practice. The total roll damping of a ship or a barge can be strongly nonlinear consisting of linear and nonlinear components; especially when bilge keel is fitted to the hull as a damping device and also when angles of roll are large. CFD simulations of nonlinear roll motion with experimental validation is gaining acceptance in the recent past.The present work reports three dimensional simulations of roll decay of a ship model, both with and without bilge keel, with experimental validation. A good comparisons of roll damping, natural period and added mass with experiments are obtained. The use of large eddy simulation on this class of problems is explored and commented upon. Ikeda's semi-empirical method over-predicts roll damping at larger roll angles. The pressure aft of bilge keel is found to be deviating whereas the pressure in front of bilge keel showed a close resemblance with semi-empirical calculations. Effect of bilge keel thickness, degrees of freedom and scaling on roll motion and damping is found to be insignificant for a barge-like ship model chosen in this study.
机译：从自由滚动衰减实验或使用适当的半经验公式估算船舶的滚动阻尼是一种常见的做法。船舶或驳船的总卷筒阻尼可以是由线性和非线性成分的强烈非线性的;特别是当舱底龙骨装配到船体时作为阻尼装置，并且当辊的角度大时也是大的。实验验证的非线性辊运动的CFD模拟在近期获得接受。目前的工作报告了船型的卷衰减的三维模拟，两者均具有和没有舱底龙骨，实验验证。获得卷起，自然时期和具有实验的添加质量的良好比较。探索并评论了对这类问题的大涡模拟的使用。 Ikeda的半经验方法通过更大的辊角度过度预测辊隙阻尼。发现舱底龙骨的压力沿偏离，而舱底龙骨前面的压力与半经验计算相比，较近的相似之处。倾斜龙骨厚度，自由度和缩放对滚动运动和阻尼的影响，发现对本研究中选择的驳船状船型微不足道。

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