月池纵荡和垂荡两种运动模态的数值模拟及验证
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摘要
利用Fluent软件对矩形月池结构在有/无直墙条件下的强迫振荡运动进行了数值模拟,并将纵荡和垂荡两种模态下不同开口宽度的数值计算结果与解析结果进行了比较。在有/无直墙情况下,当月池作纵荡运动时,无论是数值解还是解析解都表明开口宽度对水动力系数的影响很小;在作垂荡运动时,数值解和解析解都表明底部开口宽度对垂荡运动引起的水动力系数有显著的影响。当不同开口宽度的矩形月池结构在有/无直墙条件下作纵荡或垂荡运动时,数值解和解析解得到的水动力系数随频率变化的趋势一致,但是极值的大小存在差别,数值解极值的绝对值比解析解要小。
By application of the software Fluent, forced oscillations of a rectangular moon pool structure with or without a straight wall are simulated numerically. Numerical results of the moon pool in surge and heave motions are compared with the analytical results. It is shown that the width of the opening has little influence on the hydrodynamic coefficients when the moon pool with or without a straight wall is under surge motion,but has significant influence on the hydrodynamic coefficients under heave motion. Calculated variation trend of hydrodynamic coefficients with frequency agrees well with the analytical solution. However, there is difference in extreme value of the hydrodynamic coefficient between numerical and analytical solutions, and absolute extreme value in the numerical solution is smaller than that of the analytical solution.
By application of the software Fluent, forced oscillations of a rectangular moon pool structure with or without a straight wall are simulated numerically. Numerical results of the moon pool in surge and heave motions are compared with the analytical results. It is shown that the width of the opening has little influence on the hydrodynamic coefficients when the moon pool with or without a straight wall is under surge motion,but has significant influence on the hydrodynamic coefficients under heave motion. Calculated variation trend of hydrodynamic coefficients with frequency agrees well with the analytical solution. However, there is difference in extreme value of the hydrodynamic coefficient between numerical and analytical solutions, and absolute extreme value in the numerical solution is smaller than that of the analytical solution.
引文
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[10]ZHANG H S,ZHENG B F,YANG X Y.Interaction of oblique waves and a rectangular structure with an opening near a vertical wall[J].China Ocean Engineering,2017,31(2):220-229.
[11]张洪生,丁平兴,赵海虹.一般曲线坐标系下波浪传播的数值模拟[J].海洋学报:中文版,2003(01):110-119.
[2]ZHOU H W,WU G X,ZHANG H S.Wave radiation and diffraction by a two-dimensional floating rectangular body with an opening at its bottom[J].Journal of Engineering Mathematics,2013,83(1):1-22.
[3]YANG X Y,ZHANG H S,LI H T.Wave radiation and diffraction by a floating rectangular structure with an opening at its bottom in oblique seas[J].Journal of Hydrodynamics,2017,29(06):1054-1066.
[4]刘利琴,邱雨,张永恒,等.Spar平台垂荡-纵摇与月池内流体垂向振动的耦合运动研究[J].振动与冲击,2016,35(19):113-118+131.
[5]邹康,桂满海,罗良.月池水动力特性及其对船舶运动的影响研究[J].船舶与海洋工程,2017,33(5):59-63.
[6]姚震球,郭琦,凌宏杰,等.带月池超深水钻井船的水动力特性[J].船舶工程,2017,39(12):22-26.
[7]宋文浩,李欣,童波.波浪作用下月池开口对钻井船水动力的影响[J].船舶工程,2018,40(3):15-20.
[8]ZHENG Y H,SHEN Y M,YOU Y G,et al.On the radiation and diffraction of water waves by a rectangular structure with a sidewall[J].Ocean Engineering,2004,31(17):2087-2104.
[9]ZHANG H S,ZHOU H W.Wave radiation and diffraction by a two-dimensional floating body with an opening near a side wall[J].China Ocean Engineering,2013,27(4):437-450.
[10]ZHANG H S,ZHENG B F,YANG X Y.Interaction of oblique waves and a rectangular structure with an opening near a vertical wall[J].China Ocean Engineering,2017,31(2):220-229.
[11]张洪生,丁平兴,赵海虹.一般曲线坐标系下波浪传播的数值模拟[J].海洋学报:中文版,2003(01):110-119.