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Abstract. In this paper we propose to study the natural frequencies in pipe flows with consideration of fluid-structure interaction. More specifically, it is to assess system characteristics such as vibration response, the transfer function, the maximum pressure, etc., for a wide range of frequencies and show the influence of fluid-structure interaction in piping systems. The transfer matrix method and the Laplace transformation are used to calculate the natural frequencies of systems with various boundary conditions taking into account the fluid-structure interaction. Results of numerical analysis for some simple piping systems are presented to illustrate the application of the proposed method and to show the effect of fluidstructure interaction on the values of natural frequencies.

In this work, the response of a PE100 pipe under transient events following pump failure is numerically investigated. The developed numerical model was based on the generalized Kelvin-Voigt model and the Vitkovsky et al. formulation. The method of characteristics (MOC) was used for numerical discretization. The relevance of an unsteady friction term in the pressure wave damping was analyzed. Pressure and circumferential stress responses indicated high rates in the pressure waves damping for the PE100 pipe. Through a parametric study, it was shown that the HDPE pipe may serve in damping and dispersing pressure waves without the need for additional protection devices.