Applied Mathematics and Mechanics (English Edition) ›› 2019, Vol. 40 ›› Issue (8): 1119-1134.doi: https://doi.org/10.1007/s10483-019-2511-6

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In-plane dynamics of a fluid-conveying corrugated pipe supported at both ends

Yingjie WANG, Qichang ZHANG, Wei WANG, Tianzhi YANG   

  1. Tianjin Key Laboratory of Nonlinear Dynamics and Control, Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China
  • Received:2019-01-23 Revised:2019-04-17 Online:2019-08-01 Published:2019-08-01
  • Contact: Wei WANG E-mail:wangweifrancis@tju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 11872044, 11702192, and 11672187) and the National Key Research and Development Program of China (No. 2018YFB0106200)

Abstract: The dynamics and stability of fluid-conveying corrugated pipes are investigated. The flow velocity is assumed to harmonically vary along the pipe rather than with time. The dimensionless equation is discretized with the differential quadrature method (DQM). Subsequently, the effects of the mean flow velocity and two key parameters of the corrugated pipe, i.e., the amplitude of the corrugations and the total number of the corrugations, are studied. The results show that the corrugated pipe will lose stability by flutter even if it has been supported at both ends. When the total number of the corrugations is sufficient, this flutter instability occurs at a micro flow velocity. These phenomena are verified via the Runge-Kutta method. The critical flow velocity of divergence is analyzed in detail. Compared with uniform pipes, the critical velocity will be reduced due to the corrugations, thus accelerating the divergence instability. Specifically, the critical flow velocity decreases if the amplitude of the corrugations increases. However, the critical flow velocity cannot be monotonously reduced with the increase in the total number of the corrugations. An extreme point appears, which can be used to realize the parameter optimization of corrugated pipes in practical applications.

Key words: generalized variational inequality, quasi-variational inequality, differential quadrature method (DQM), fluid-structure interaction, fluid-conveying corrugated pipe, flutter, bifurcation

2010 MSC Number: 

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