Title page for etd-0819111-163245


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URN etd-0819111-163245
Author Yi-Hung Chen
Author's Email Address No Public.
Statistics This thesis had been viewed 5385 times. Download 641 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2010
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Numerical simulation of flow induced vibration of the staggered cylinder arrays in shear flow
Date of Defense 2011-07-04
Page Count 128
Keyword
  • Shear parameter
  • Fluid elastic vibration
  • The staggered cylinder arrays
  • Mass ratio
  • Dynamic mesh
  • Abstract The present study aims to explore dynamical behavior of the single cylinder and the staggered cylinder arrays in shear flow by numerical simulations. The results are compared with the case in uniform flow. After the observation of the fluid-elastic vibration in the staggered cylinder arrays in the two flows. This paper investigates the effects of the spacing(P/D), mass ratio and the shear parameter on the trajectories, oscillation amplitudes among the different cylinders.
    Continuity equation and momentum equations are used to solve the aforementioned problems alternatively by PISO method. Dynamic meshing techniques together with the cylinder motion equations are employed in the simulation. Under the different conditions, flow types and cylinder motion models, lock-in and fluid-elastic vibration are studied when the flow crosses the staggered cylinder arrays.
    The results show that the motion and the flow field around the single cylinder is consistent with the literature. In terms of the staggered cylinder arrays in uniform flow, the oscillation is dominated by the vortex shedding, and the lock-in area in the downstream cylinders is greater than the upstream cylinders. Fluid elastic vibration occurs in the small spacing between cylinders. In shear flow, when the shear parameters are larger or the spacing between cylinders are smaller, the more likely the fluid elastic vibration of the cylinders will occur.
    Advisory Committee
  • Yang, Chien-Yuh - chair
  • Chien-Chou Tseng - co-chair
  • Ru Yang - advisor
  • Files
  • etd-0819111-163245.pdf
  • Indicate in-campus at 3 year and off-campus access at 5 year.
    Date of Submission 2011-08-19

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