Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Sloshing Damping in a Swaying Rectangular Tank Using a Porous Bulkhead

투과성 격벽을 이용한 수평 운동하는 사각형 탱크내의 슬로싱 감쇠

  • Cho, Il-Hyoung (Department of Ocean System Engineering, Jeju National University)
  • 조일형 (제주대학교 해양시스템공학과)
  • Received : 2018.07.17
  • Accepted : 2018.08.14
  • Published : 2018.08.31
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Abstract

The performance of a porous swash bulkhead for the reduction of the resonant liquid motion in a swaying rectangular tank was investigated based on the assumption of linear potential theory. The Galerkin method (Porter and Evans, 1995) was used to solve the potential flow model by adding a viscous frictional damping term to the free-surface condition. By comparing the experimental results and the analytical solutions, we verified that the frictional damping coefficient was 0.4. Darcy's law was used to consider the energy dissipation at a porous bulkhead. The tool that was developed with a built-in frictional damping coefficient of 0.4 was confirmed by small-scale experiments. Using this tool, the free-surface elevation, hydrodynamic force (added mass, damping coefficient) on a wall, and the horizontal load on a bulkhead were assessed for various combinations of porosity and submergence depth. It was found that the vertical porous bulkhead can suppress sloshing motions significantly when properly designed and by selecting the appropriate porosity(${\approx}0.1$) and submergence depth.

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References

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