摘要
采用总变差减小(TVD)格式模拟了一维有压管道水击过程,对管道中阀门突然关闭和缓慢关闭引起的水击压强进行了数值计算。通过改变阀门关闭速度,分析TVD格式对水击数值模拟精度的影响。结果表明,与传统经典差分二阶MC格式相比,阀门关闭速度越快,TVD格式捕捉激波间断的能力越强,模拟水击波效果越好;当阀门关闭速度缓慢到一定程度,TVD格式与MC计算方法所得结果基本吻合,与解析解最大误差不超过2%。说明TVD格式是数值模拟水击现象行之有效的方法之一。
The Total Variation Diminishing（ TVD） scheme is adopted to simulate one- dimensional pressure pipeline water hammer caused by sudden close and slow close of the valve. Through changing the valve＇s closing speed,the influence of TVD scheme on simulation accuracy of water hammer pressure is analyzed. The results show that the faster the valve closes,the better the shock wave intermittence was captured by TVD scheme,compared with the typical second difference MC scheme. When the valve＇s closing speed is reduced to a certain degree,the TVD scheme and conventional calculation method have the same accuracy,and their errors with analytic solution are less than 2%. The TVD scheme can effectively simulate the water hammer of pressure pipeline.
出处
《人民长江》
北大核心
2015年第12期57-59,共3页
Yangtze River
关键词
数值模拟
TVD格式
水击
阀门关闭速度
numerical simulation
TVD scheme
water hammer
valve closing speed
