摘要
为提高节点初流量的计算精度,引入子域积分法进行改进。根据自由面与单元的相交情况将单元划分为若干个子域,然后在每个子域布置数值积分点,这就避免了单元内节点初流量被忽略或多计入,也不会出现因自由面在积分点附近的微小移动而引起的节点初流量突变,实现了对单元节点初流量更准确的计算。数值算例表明,改进后的初流量法稳定性、收敛性良好。
In order to calculate the nodal initial flow more precisely, sub-domain integration is adopted to improve the initial flow method. Elements crossed by free surface are divided into several sub-domains according to the position of the free surface. And numerical integration points are sampled in each sub-domain as if it is a conventional element. By this means, flow neglection, flow overestimate and flow jump when free surface moves from one side of numerical integration points to the other are avoided. Numerical results show that good stability and rapid convergence are achieved.
出处
《水电能源科学》
北大核心
2013年第3期15-18,共4页
Water Resources and Power
基金
国家国际科技合作计划基金资助项目(2010DFA74520)
"十一五"国家科技支撑计划基金资助项目(2008BAB42b05
2008BAB42B06)
关键词
岩土力学
有自由面渗流
初流量法
子域积分
节点初流量
geotechnical mechanics
unconfined seepage
initial flow method
sub-domain integration
nodal initial flow
