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Effect of Free Surface Nonlinear and Fluid Viscosity on Fluid Resonance in the Narrow Gap

[+] Author Affiliations
Sheng-chao Jiang, Li Zou, Tie-zhi Sun

Dalian University of Technology, Dalian, China

Chang-feng Liu

Dalian Ocean University, Dalian, China

Paper No. OMAE2017-62480, pp. V07AT06A014; 8 pages
doi:10.1115/OMAE2017-62480
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 7A: Ocean Engineering
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5773-1
  • Copyright © 2017 by ASME

abstract

Numerical simulations are carried out for gap resonance problem between two side-by-side non-identical boxes. The linear potential model over-predicts the resonant amplitude in the narrow gap because it not only neglects the energy dissipation due to vortical motion, but also neglect the nonlinearity due to free surface. More relative energy are reflected with the increase of incident wave amplitude, leading to the decrease of relative resonant amplitude and relative energy dissipation in the narrow gap at resonant frequency. When the incident wave frequency is outside a little band to resonant frequency, relative energy dissipation becomes the dominant factor for the decrease of relative wave amplitude in the narrow gap with the increase of incident wave amplitudes. In a word, both the free surface nonlinearity and fluid viscosity play the important, but different, roles on wave resonances in the narrow gap.

Copyright © 2017 by ASME
Topics: Resonance , Fluids , Viscosity

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