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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：使用CFD船卷阻尼系数预测

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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：对于在共振频率下进行卷起运动的船舶，滚动恢复时刻和惯性的虚拟时刻互相抵消，并且只有阻尼力矩抵抗滚动令人兴奋的时刻。因此，精确计算辊阻尼力矩改善了滚动运动预测。有几种方法来计算阻尼矩;然而，其中大多数未能考虑粘性效果，例如基于潜在的理论的方法。实验测量考虑了粘性效果;但是，它们很贵。计算流体动力学（CFD）方法是准确地考虑粘性效果的替代方案。在本研究中，采用基于谐波激励辊运动技术的CFD方法来计算不同条件下的辊运动特性和阻尼系数。研究了附属物，FROUDE号和自由度对卷运动特性和阻尼系数的影响，以进行模型规模和满量程，以研究规模效应。模型比例的结果与实验测量进行比较，发现了良好的相关性。

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