Research Article Open Access

Numerical Study of Static and Dynamic Instabilities of Pinned-Pinned Pipe under Different Parameters

Dahmane Mouloud1, Zahaf Samir2, Benkhettab Mohamed3 and Boutchicha Djilali1
  • 1 USTO-MB, Algeria
  • 2 University of Djilali Bounaama-Khamis Meliana, Algeria
  • 3 Mostaganem University-Abdelhamid Ibn Badis, Algeria
American Journal of Engineering and Applied Sciences
Volume 13 No. 4, 2020, 725-735

DOI: https://doi.org/10.3844/ajeassp.2020.725.735

Submitted On: 9 September 2020 Published On: 21 November 2020

How to Cite: Mouloud, D., Samir, Z., Mohamed, B. & Djilali, B. (2020). Numerical Study of Static and Dynamic Instabilities of Pinned-Pinned Pipe under Different Parameters. American Journal of Engineering and Applied Sciences, 13(4), 725-735. https://doi.org/10.3844/ajeassp.2020.725.735

Abstract

In this study, the natural frequencies of the pipe transporting an fluid resting on an elastic Winkler-type and the critical velocities of instabilities are obtained by the standard finite element method. A dynamic characteristic of a pipe carrying internal fluid undergoes mechanical load due to inertia effect of fluid, Coriolis force, fluid kinetic force due to fluid flow velocity, dynamic load due to inertia effect on the pipe structure. A numerical modal analysis is realized in the fluid-structure interaction configuration. One dimensional beam finite element is used for investigating the dynamic behavior of the thin pipe. According to the approved method, the different elementary matrices were extracted, which were including to a code called Matlab. We developed a program under Matlab with R2017b version, where computations are in the complex planes. The initial approach is based on some research and analytical models. The numerical results show satisfactory agreement with the analytical results. The increase in flow velocity, mass ratio and length reduced from the rigidity of the system. Regions and range of instabilities are presented by numerical aspects. We determined the influence of the different parameters on the static and dynamic instabilities of the system.

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Keywords

  • Pipe Conveying Fluid
  • Natural Frequency
  • Critical Velocity
  • Instability
  • Elastic Foundation
  • FEM
  • MATLAB