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首页> 外文期刊>Journal of Ship Research >Ship Roll Damping Coefficient Prediction Using CFD
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Ship Roll Damping Coefficient Prediction Using CFD

机译：基于CFD的船舶侧倾阻尼系数预测

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For a ship undergoing roll motion at a resonance frequency, the roll restoring moment and virtual moment of inertia counteract each other and only the damping moment resists the roll exciting moments. Hence, accurate computation of the roll damping moment improves the roll motion prediction. There are several methods to calculate the damping moment; however, most of them fail to consider the viscous effects, such as the potential theory-based method. The experimental measurements take into account the viscous effect; however, they are expensive. The Computational Fluid Dynamics (CFD) method is an alternative to accurately consider the viscous effect. In this study, a CFD approach based on harmonic exciting roll motion technique is adopted to compute the roll motion characteristics and damping coefficients at different conditions. The impact of appendages, Froude number, and degrees of freedom on roll motion characteristics and damping coefficients are investigated for the model scale and full scale to study the scale effects. The results at the model scale are compared against experimental measurements and good correlation was found.
机译：对于以共振频率进行横摇运动的船舶，横摇恢复力矩和虚拟惯性矩会相互抵消，并且只有阻尼力矩才能抵抗横摇激振力矩。因此，侧倾阻尼力矩的精确计算改善了侧倾运动预测。有几种计算阻尼力矩的方法。然而，他们大多数都没有考虑粘性效应，例如潜在的基于理论的方法。实验测量考虑了粘性作用。但是，它们很昂贵。计算流体动力学（CFD）方法是准确考虑粘性效应的一种替代方法。在这项研究中，采用基于谐波激励侧倾运动技术的CFD方法来计算不同条件下的侧倾运动特性和阻尼系数。对于模型比例和满比例，研究了附件，弗洛德数和自由度对侧倾运动特性和阻尼系数的影响，以研究比例效应。将模型规模的结果与实验测量结果进行比较，并发现良好的相关性。

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