摘要
根据实际物理实验,采用ALE有限元方法模拟了冲击情况下T型管及管内流体动态响应的水锤过程。经过对比关键点水压时程变化的仿真结果与实验数据,验证了ALE流固耦合有限元方法在水力瞬变仿真模拟方面的可行性。在此基础上,进一步分析了T型管的变形和动态周向应力。通过仿真发现管壁动态周向应力峰值大约是静周向应力的1.2～1.6倍。并且周向应力呈现与水锤压力变化一致的周期性,管壁动态周向应力主要受水锤的影响。这证明动态效应是导致更大动态应力的原因。这一结论与直管的结论一致。
Based on the reported physical experiment,the dynamic response of a T-shape pipe and fluid inside was simulated through the arbitrary Lagrangian-Eulerian(ALE)finite element method.The simulation results and experiment data were consistent.It proved that the ALE finite element method can be applied in modeling the water hammer.Based on this,more detail study about the T-shape pipe and the dynamic hoop stress during the water hammer was carried out.The maximum hoop stress in the process was equivalent to 1.2~1.6 times of the stress that would be expected if an equivalent static water pressure was applied to the inner wall of the pipe.The periodicity of the dynamic hoop stress was same as that of the water hammer pressure.This conclusion was same as the result of a straight pipe too.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第4期54-58,共5页
Journal of Vibration and Shock
基金
教育部博士点基金(20070248110)资助
关键词
流固耦合
水锤
动态响应
任意拉格朗日-欧拉法
fluid-structure interaction(FSI)
water hammer
dynamic response
arbitrary Lagrangian Eulerian(ALE)
