误差激励作用下三维矩形液舱晃荡数值仿真  

Numerical simulation on sloshing in 3D rectangle liquid tank under error excitation

作　　者：陈世文[1] 杨志勋[1] 杨钰城[1] 阮诗论 岳前进[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室工程力学系,辽宁大连116024

出　　处：《计算机辅助工程》2016年第4期23-28,共6页Computer Aided Engineering

基　　金：国家科技重大专项子课题(2011ZX05026-006-06);国家自然科学基金(10902018)

摘　　要：原始激励的随机小幅变化会对晃荡载荷造成不确定影响,往往具有较强的随机性和非线性现象.通过计算流体力学(Computational Fluid Mechanics,CFD)方法构造三维矩形液舱载液率为85%的晃荡数值模型,并基于相同条件开展模型晃荡实验;通过追踪自由表面变化和晃荡冲击压力时程比较分析验证数值模型的有效性.基于原始激励构造一定误差变化范围(2%,5%和10%)内的误差激励,通过数值模拟分别提取拐角监测位置处的晃荡载荷时程曲线.研究结果表明:在不同误差激励下,虽然晃荡波形和频率基本一致,但压力峰值偏差与误差大小不呈现正相关效应,最大偏差约为33.17%;微小激励误差有可能对晃荡载荷结果造成较大的偏差影响.The radom slight change of original excitation would cause uncertain effect on sloshing load, which leads to strong stochastic and nonlinear phenomenon. A numerical model at 85% filling level is built for a 3D rectangle tank by Computational Fluid Mechanics （CFD） method, and the sloshing test is performed for the models under the same conditions; by comparing the free surface change and the time- history of sloshing impact pressure, the validity of the numerical model is verified. The error excitations with certain value （ 2% , 5% and 10% ） are given from the original excitation, under which the time- history curves of sloshing load of the detecting zone of the up-comer are obtained. The research results indicate that,there are similar sloshing wave form and frequency under different error excitation, but the deviation of pressure peak would not present positive correlation effect with error magnitude, and the maximum difference value is 33. 17% ; moreover, a slight excitation error would cause higher change of sloshing impact pressure error.

关 键 词：液舱 液体晃荡 误差激励 冲击压力 数值模拟 

分 类 号：U663.85[交通运输工程—船舶及航道工程]