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首页> 外文期刊>Ocean Engineering >A linearization coefficient for Morison force considering the intermittent effect due to free surface fluctuation
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A linearization coefficient for Morison force considering the intermittent effect due to free surface fluctuation

机译：考虑表面自由波动引起的间歇效应的莫里森力的线性化系数

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摘要

For members located near the free surface, an intermittent effect caused by the free surface fluctuation makes statistical properties of fluid particle kinematics different. Therefore, a linearization coefficient of the drag force derived under the assumption that the particle velocity and acceleration follow the Gaussian process are not valid above the still water level. The present paper derives the linearization coefficient for the drag force considering the intermittent effect. Force spectra and mean values of force maxima at each location are compared between nonlinear and linearized drag force to verify the validity of the proposed coefficient. The linearization coefficients derived from fully submerged section are constant irrespective of the observation position, and it tends to underestimate both the mean values of peak forces and force spectra as the observation height increases near the free surface. The proposed linearization coefficient reflects the effect of the free surface fluctuation and improves the error between the nonlinear and linear drag with increasing observation position.
机译：对于位于自由表面附近的构件，由自由表面波动引起的间歇效应使流体粒子运动学的统计特性不同。因此，在静止水位以上时，假设粒子速度和加速度遵循高斯过程而得出的阻力线性化系数无效。考虑间歇效应，本文推导了阻力的线性化系数。在非线性和线性拖曳力之间比较力谱和每个位置的力最大值平均值，以验证所提出系数的有效性。从完全浸没截面得出的线性化系数是恒定的，与观察位置无关，并且随着观察高度在自由表面附近的增加，它往往会低估峰值力和力谱的平均值。提出的线性化系数反映了自由表面波动的影响，并随着观察位置的增加而改善了非线性和线性阻力之间的误差。

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