Vertical motion of a periodically driven floating disc

Abstract

We present the results of a combined theoretical and experimental investigation into the vertical dynamics of floating discs subjected to an imposed time-periodic forcing. The axisymmetric and inviscid wavefield is governed by a linear elliptic boundary value problem with mixed boundary conditions, wherein the no-penetration boundary condition is satisfied under the disc while the free surface boundary conditions are enforced away from it. The problem is solved by recasting the system of partial differential equations as a second-kind Fredholm integral equation which is then solved numerically. The solution furnishes a prediction for the dependence of the disc's oscillation amplitude on the forcing frequency, which exhibits good agreement with experiments. We interpret our results physically by computing the added mass, wave damping and effective spring coefficients of the disc, both numerically for a range of forcing frequencies and analytically in the low-frequency limit.

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BibTeX RIS

BibTeX

@misc{oza2026vertical,
  title = {{Vertical motion of a periodically driven floating disc}},
  author = {Anand U. Oza and Jack-William Barotta and Eli Silver and Daniel M. Harris},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2605.21940},
  eprint = {2605.21940},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.21940},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Vertical motion of a periodically driven floating disc
AU  - Anand U. Oza
AU  - Jack-William Barotta
AU  - Eli Silver
AU  - Daniel M. Harris
PY  - 2026
DA  - 2026/09/16
PB  - arXiv
DO  - 10.48550/arxiv.2605.21940
UR  - https://arxiv.org/abs/2605.21940
AB  - We present the results of a combined theoretical and experimental investigation into the vertical dynamics of floating discs subjected to an imposed time-periodic forcing. The axisymmetric and inviscid wavefield is governed by a linear elliptic boundary value problem with mixed boundary conditions, wherein the no-penetration boundary condition is satisfied under the disc while the free surface boundary conditions are enforced away from it. The problem is solved by recasting the system of partial differential equations as a second-kind Fredholm integral equation which is then solved numerically. The solution furnishes a prediction for the dependence of the disc's oscillation amplitude on the forcing frequency, which exhibits good agreement with experiments. We interpret our results physically by computing the added mass, wave damping and effective spring coefficients of the disc, both numerically for a range of forcing frequencies and analytically in the low-frequency limit.
ER  -

Abstract

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