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Experiments in Fluids

, Volume 53, Issue 6, pp 1879–1894 | Cite as

Green water impact pressure on a three-dimensional model structure

  • Kusalika Ariyarathne
  • Kuang-An Chang
  • Richard Mercier
Research Article

Abstract

Green water impact pressure due to plunging breaking waves impinging on a simplified, three-dimensional model structure was investigated in the laboratory. Two breaking wave conditions were tested: one with waves impinging on the vertical wall of the model at the still water level and the other with waves impinging on the horizontal deck surface. Pressure measurements were taken at locations in two vertical planes on the deck surface with one at centerline of deck and the other between the centerline and an edge. Impact pressure was found to be quite different between the two wave conditions even though the incoming waves are essentially identical. Two types of pressure variations were observed—impulsive type and non-impulsive type. Much higher pressure was observed for the deck impingement wave condition, even though the flow velocities were quite close. Void fraction was also measured at selected points. Impact pressure was correlated with the mean kinetic energy calculated based on the measured mean velocities and void fraction. Impact coefficient, defined as the ratio between the maximum pressure at a given point and the corresponding mean kinetic energy, was obtained. For the wall impingement wave condition, the relationship between impact pressure and mean kinetic energy is linear with the impact coefficient close to 1.3. For the deck impingement wave condition, the above relationship does not show good correlation; the impact coefficient was between 0.6 and 7. The impact coefficient was found to be a function of the rate of pressure rise.

Keywords

Void Fraction Breaking Wave Impact Pressure Wall Impingement Impact Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors wish to acknowledge the financial support provided by the Offshore Technology Research Center through its cooperative agreement with the Minerals Management Service and through its Industry Consortium, under the project entitled “Loads due to Extreme Wave Crests.”

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Kusalika Ariyarathne
    • 1
  • Kuang-An Chang
    • 1
  • Richard Mercier
    • 1
  1. 1.Zachry Department of Civil EngineeringTexas A&M UniversityCollege StationUSA

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