Study on the Design of Moonpool Form Based on Ship Resistance and Flow Field Characteristics

Moonpool is a common type of opening structure right through the hull from deck to bottom at a certain location on various engineering vessels, which allows equipment to be put into the water to operate. But moonpool often brings about disadvantageous impact on the resistance performance in navigation as a result of the complex flow in the moonpool, and its form has vital effect on the state of the flow field. In this paper, CFD method was used to perform numerical calculations of resistance in calm water for a drillship at different transit speeds, considering six typical moonpool types. The oscillation mode and violent motion of water in the moonpool were studied. The rules and causes of the influence of moonpool form on ship resistance and flow field characteristics were analyzed with the flow details. In addition, some suggestions were put forward for the design of these moonpool types. The result shows that the traditional straight-wall moonpools are prone to cause violent oscillations of water in the moonpools and large resistance increases. What’s more, the oscillation amplitude and added resistance of the square moonpool are larger than the rectangular one. While the modified moonpool forms studied in this paper have significant effects on reducing oscillation amplitude and improving resistance performance, through increasing damping of fluid motions, restraining energy acquisition and strong effect of large-scale vortices on the back wall and changing the natural period of water oscillation in the moonpool.


  • English

Media Info

  • Media Type: Web
  • Edition: 1
  • Features: References;
  • Pagination: pp 425-445
  • Monograph Title: Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume I
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 01919040
  • Record Type: Publication
  • ISBN: 9789811546235
  • Files: TRIS
  • Created Date: May 20 2024 2:02PM