建筑管道的流固耦合动力学分析

针对民用建筑管道振动问题,采用流固耦合对管道进行流场及模态分析,通过流场分析得出由于脉动压力的影响,其湍动能也有较大波动,且在弯管处的湍动能波动最为明显,且弯管处伴随着二次流现象,极大的增加了管道内的能量损失,也是引起管道振动的一部分原因;通过模态分析得出在第一阶固有频率与压力脉动频率较为接近,有较高共振的可能;为消除共振,对管道施加不同约束,得出固定约束应与弯管保持一定的距离,同时在弯管两端同时施加约束能够使管道振动幅度最小;通过实验与仿真对比,说明了流固耦合在管道振动分析中具有一定的可行性,且具有一定的工程应用价值。

Flow f ield and modal analysis of pipelines using f luid-solid coupling for civil building pipeline vibration problems,The turbulent energy is affected by the inlet pressure pulsation and has large f luctuations in the pipeline,and is most obvious at the elbow.At the same time,accompanied by the secondary f low phenomenon,the energy loss in the pipeline is greatly increased and the pipeline vibration is caused;Through modal analysis,it is found that the f irst-order natural frequency is close to the pressure pulsation frequency,and it is highly probable that resonance occurs;In order to eliminate the resonance phenomenon,different constraints are applied to the pipeline to analyze,and it is concluded that the f ixed constraint should be kept at a certain distance from the elbow,and the simultaneous application of the constraint at both ends of the elbow can minimize the vibration amplitude of the pipeline;The comparison between experiment and simulation shows that the f luid-solid coupling has certain feasibility in pipeline vibration analysis and has certain engineering application value.