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A Numerical Treatment of the Boundary Conditions for Stable Assessment of Hydrodynamic Impact Pressure

[+] Author Affiliations
Liang-Yee Cheng

University of São Paulo, São Paulo, SP, Brazil

Makoto Arai

Yokohama National University, Yokohama, Japan

Paper No. OMAE2002-28266, pp. 807-816; 10 pages
doi:10.1115/OMAE2002-28266
From:
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 2
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3612-6 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME

abstract

One of the critical points in the numerical assessment of hydrodynamic impact loads is accurate and stable descriptions of the pressures. Due to discrete approximations adopted by available numerical methods, unnatural violently-oscillating time histories of the impulsive pressure, caused by unstable or even non-converging numerical computation, are generally obtained. The aim of this paper is to investigate the unstable nature of the impulsive pressure computation. Also, a new numerical treatment of the boundary condition for accurate and stable assessment of the sloshing impact pressure based on rectangular grid system is proposed. The comparisons of the computed results with the experimental ones confirmed the accuracy of the proposed technique. The improvements achieved over the existing approaches are also shown herein.

Copyright © 2002 by ASME

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