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Bending-torsional stability analysis of aerodynamically covered pipes with inclined terminal nozzle and concurrent internal and external flows

Askarian, A. R ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jfluidstructs.2020.102932
  3. Publisher: Academic Press , 2020
  4. Abstract:
  5. Stability analysis of a cantilevered pipe with an inclined terminal nozzle as well as simultaneous internal and external fluid flows is investigated in this study. The pipe is embedded in an aerodynamic cover with negligible mass and stiffness simply to streamline the external flow and avoid vortex induced vibrations. The structure of pipe is modeled as an Euler–Bernoulli beam and effects of internal fluid flow including flow-induced inertia, Coriolis and centrifugal forces and the follower force induced by the exhausting jet are taken into account. In addition, neglecting the compressibility effect and using the unsteady Wagner model, aerodynamic loading is determined as a distributed lateral load for any generic structural state. The integral form of coupled equations of motion are obtained using the Hamilton's principle. Solution to the coupled flexural–torsional equations of motion is realized via the extended Galerkin method. After discretization of the equations of motion, an eigenvalue representation of the problem is obtained. Several parameter studies are then conducted to examine the effects of concurrent fluid flows and other related parameters on the stability margins of the system. © 2020 Elsevier Ltd
  6. Keywords:
  7. Bending-torsional instability ; Cantilevered pipe ; Follower force ; Inclined nozzle ; Unsteady aerodynamic ; Wagner model ; Aerodynamics ; Eigenvalues and eigenfunctions ; Galerkin methods ; Nozzles ; Stability ; Compressibility effects ; Follower forces ; Hamilton's principle ; Inclined nozzles ; Internal fluid flows ; Unsteady aerodynamics ; Vortex induced vibration ; Wagner models ; Equations of motion
  8. Source: Journal of Fluids and Structures ; Volume 94 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0889974618309812