Investigation of the hydrodynamic model test of forced rolling for a barge using PIV
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摘要:
目的 为研究船舶横摇过程中粘流场细节以提高横摇阻尼数值模拟精度， 方法 开展了粒子图像测速（PIV）技术在静水强迫横摇水动力测试中的应用研究。首先，采用自制的强迫横摇装置在水池中开展某驳船在不同摇幅和振荡周期下船舶横摇水动力与舭部流场的同步测试。观测舭部粘流场在船体振荡过程中的变化规律，研究横摇阻尼系数随摇幅和周期的变化规律。然后，将模型试验测试结果与计算流体动力学（CFD）软件模拟结果进行对比。 结果 结果表明，CFD预报船舶横摇整体阻尼系数精度较好，但预报的局部流场细节与模型试验测试结果间存在一定的差异， 结论 需在模型试验技术和CFD预报技术上开展进一步研究。 Abstract: In order to study the physical details of viscous flow in ship roll motions and improve the accuracy of ship roll damping numerical simulation, the application of the Particle Image Velocimetry (PIV) technique is investigated in model tests of forced ship rolling in calm water. The hydrodynamic force and flow field at the bilge region are simultaneously measured for barges at different amplitudes and frequencies in which the self-made forced rolling facility was used. In the model test, the viscous flow variation with the time around the bilge region was studied during ship rolling motion. The changes in ship roll damping coefficients with the rolling amplitude and period were also investigated. A comparison of the model test results with the Computational Fluid Dynamics (CFD) results shows that the numerical ship roll damping coefficients agree well with the model test results, while the differences in the local flow details exist between the CFD results and model test results. Further research into the model test technique and CFD application is required. -
图 1 哈尔滨工程大学拖曳水池及拖车
Figure 1. Towing tank and carriage in Harbin Engineering University
图 4 PIV强迫横摇粘流场测试系统工作图
Figure 4. PIV viscous flow field measurement system for forced roll motion
图 5 无因次横摇阻尼系数随频率和摇幅变化曲线
Figure 5. Variation of non-dimensional roll damping coefficients with respect to roll frequencies and amplitudes
图 6 同一周期内不同时刻船模舭部流场速度云图
Figure 6. Flow velocity contours near the ship model's bilge at different time within one period
图 7 CFD数值模拟与水池试验横摇阻尼系数结果比较
Figure 7. Comparison of non-dimensional roll damping coefficients between CFD numerical simulation and experimental results
图 8 PIV测量得到的流场涡强 (左) 与CFD模拟得到的流场涡强 (右)
Figure 8. Comparison of vorticity contours between PIV measurement (left) and CFD simulation (right)
表 1 模型主尺度
Table 1. Principal dimensions of ship model
项目 模型尺寸 船长L/m 3 型宽B/m 0.4 吃水T/m 0.2 型深H/m 0.4 排水量D/kg 244.8 横摇转动轴心位置 (距船模基线) z0 /m 0.15 
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