摘要
基于商用CFD软件,结合重叠网格技术,模拟了某穿浪双体船艏部三维模型入水砰击,将模拟结果与试验数值结果和试验过程图像进行对比,以验证方法的准确性和有效性.进一步研究了双体船湿甲板砰击机理及发展过程,结果表明砰击的发展与分段模型下方残留气体溢出有关,且砰击的发展时间与连接桥下方气体的溢出时间接近,随着跌落高度的增加,气体压缩、液体飞溅等非线性因素产生的作用力与阻碍物体运动所需的砰击压力比例逐渐趋于稳定;而随着分段模型质量的增加,入水后的加速度峰值明显降低,当分段模型质量达到一定值时,加速度峰值和砰击压力峰值不受分段模型质量影响,逐渐趋于稳定值.
Based on the commercial CFD software and combined with the overlapping grid technic,the slam of 3-D model of a catamarans stem was simulated.The validity and the veracity of this method were proved by the comparison of the test results and the slamming process images.And the mechanism and the development process of the catamaran wet deck slamming were further researched.The result shows that the development of the slamming process is connected with the residual gas overflow underneath the subsection,and the development time of the slamming process is very close to the time the gas underneath the cross structure overflows.Further,the ratio of the force caused by some nonlinear factors（such as the gas compression and the splash）to the slamming pressure used to impede the object motion is stable along with the increase of the drop height.The acceleration peak reduces evidently after entering the water,along with the increase of the subsection mass,but when the subsection mass reaches a certain value,the acceleration peak and the slamming pressure peak will be stabilized and not affected by mass changes.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第6期42-47,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
高等学校博士学科点专项科研基金资助项目(23132304120011)
黑龙江省自然科学基金资助项目(A201406)
哈尔滨工程大学多体船技术国家重点学科实验室开放基金资助项目(HEUDTC1409)
船舶预研支撑技术基金资助项目(13J1.5.1)
关键词
计算流体力学
双体船
砰击
重叠网格
船体入水
computational fluid dynamics
catamarans
slamming
overlapping grid
ship water-entry
