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Numerical and Experimental Damping of Piston and Sloshing Motions in Moonpools

[+] Author Affiliations
Jan Löhrmann, Andrés Cura-Hochbaum

Technische Universität Berlin, Berlin, Germany

Pablo M. Carrica

University of Iowa, Iowa City, IA

Paper No. OMAE2017-61637, pp. V001T01A005; 15 pages
doi:10.1115/OMAE2017-61637
From:
  • ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Trondheim, Norway, June 25–30, 2017
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5763-2
  • Copyright © 2017 by ASME

abstract

Damping of waves in moonpools has been investigated. Several different geometries of the moonpool have been considered, which are being mainly characterised by a piston motion of the free surface in the moonpools, while some sloshing effects are visible. A numerical damping approach has been implemented into a viscous solver to simulate the effect of perforated bulkheads without the necessity to create a complex grid. The simulations have been compared with respective model tests. Two different porosities of the bulkhead have been experimentally investigated. The simulations have been conducted for a variety of Froude numbers, moonpool layouts and in calm water as well as waves. A dependency of the surface elevation natural frequency on the ship speed has been found. Furthermore, the numerically determined surface elevation inside the moonpool has been compared with respective experimental data. Based on the surface elevation, the resulting damping for the different layouts is determined and discussed.

Copyright © 2017 by ASME
Topics: Damping , Pistons , Sloshing

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