Author
S.I. Karlsen
Bio: S.I. Karlsen is an academic researcher. The author has contributed to research in topics: Slamming & Bow wave. The author has an hindex of 1, co-authored 1 publications receiving 15 citations.
Topics: Slamming, Bow wave, Mechanical wave, Wavelength
Papers
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01 Jan 2001
TL;DR: In this paper, the authors present results from 1:55 scaled model tests with an FPSO in irregular waves and investigate the interactions leading to green sea events in steep random waves and the resulting impact loads.
Abstract: Publisher Summary This chapter presents results from 1:55 scaled model tests with an FPSO in irregular waves. Interactions leading to green sea events in steep random waves and the resulting impact loads are investigated. This includes water on deck as well as bow slamming. In particular, storm sea states with moderate wavelengths are considered. The measuring equipment include wave probes in a grid at the bow and on the front deck, vessel motions, as well as load and pressure cells on the deck house and on the bow. High-resolution video recordings are also included. One main experience from this experimental case study is that the most critical green sea and impact events observed in steep random wave conditions are mostly generated by steep and energetic waves or wave groups. Nonlinear effects in the incoming waves, including the kinematics, play an important role. The ship motion is also important. Thus, relative short and steep waves are more critical than longer waves due to the phase lag of the pitch motion. Large pitch amplitudes can worsen the problem. It has been observed that the most critical impact load events, with average pressures above 200 kPa over areas more than 5 m2, occur as very rare events, and it is a challenge to become able to predict their probability.
19 citations
Cited by
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TL;DR: Theoretical status and future challenges for water entry on an initially calm free surface, wetdeck slamming, green water and sloshing are presented in this article, emphasizing that slamming should be considered in the framework of structural dynamics response and integrated with the global flow analysis around a ship or ocean structure or with violent fluid motion inside a tank.
Abstract: Practical slamming problems for ships and ocean structures are briefly described. Theoretical status and future challenges for water entry on an initially calm free surface, wetdeck slamming, green water and sloshing are presented. It is emphasized that slamming should be considered in the framework of structural dynamics response and integrated with the global flow analysis around a ship or ocean structure or with violent fluid motion inside a tank. Two-phase flow can give important loading and needs to be better understood. Slamming on a VLFS with shallow draft is dealt with in detail.
169 citations
TL;DR: In this paper, a Navier-Stokes solver with a free surface capturing scheme was used to numerically model green water loads on a moored FPSO exposed to head sea waves.
66 citations
TL;DR: In this paper, the authors investigated the water-on-deck phenomena by considering a simplified two-dimensional flow problem and showed that the potential-flow model suffices to give a robust and efficient estimate of green-water loads until large breaking phenomena, usually following impact events, are observed.
58 citations
01 Oct 2003
47 citations
Dissertation•
01 Jan 2015
TL;DR: In this article, the SuperGen UK Centre for Marine Energy Research (UKCMER) was used for marine energy research and applied it to the UK's offshore energy research program.
Abstract: Engineering and Physical Sciences Research Council (EPSRC) via SuperGen UK Centre for Marine Energy Research (UKCMER)
35 citations