Non-linear hydrodynamics of thin laminae undergoing large harmonic oscillations in a viscous fluid

Angelantonio Tafuni, Iskender Sahin

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Smoothed Particle Hydrodynamics is implemented to study the motion of a thin rigid lamina undergoing large harmonic oscillations in a viscous fluid. Particularly, the flow physics in the proximity of the lamina is resolved and contours of non-dimensional velocity, vorticity and pressure are presented for selected oscillation regimes. The computation of the hydrodynamic load due to the fluid-structure interaction is carried out using Fourier decomposition to express the total fluid force in terms of a non-dimensional complex-valued hydrodynamic function, whose real and imaginary parts identify added mass and damping coefficients, respectively. For small oscillations, the hydrodynamic force reflects the harmonic nature of the displacement, whereas multiple harmonics are observed as both the amplitude and frequency of oscillation increase. We propose a novel formulation of hydrodynamic function that incorporates added mass and damping coefficients for a thin rigid lamina spanning large amplitudes in viscous fluids in a broad range of the oscillation frequencies. Results of the simulations are validated against numerical and experimental works available in the literature in addition to theoretical predictions for the limit case of zero-amplitude oscillations.

Original languageEnglish (US)
Pages (from-to)101-117
Number of pages17
JournalJournal of Fluids and Structures
Volume52
DOIs
StatePublished - Jan 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Keywords

  • Added mass
  • Fluid-structure interaction
  • Hydrodynamic function
  • Non-linear damping
  • Smoothed Particle Hydrodynamics
  • Viscous fluid

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