Water motion in a drillship moonpool during transit is a complex phenomenon. It could cause a drastic increase in drillship resistance during transit due to the water oscillation in the moonpool and consequently increase the fuel consumption. Moonpool oscillations are initiated by vortices that start at the upstream moonpool edge underwater. The oscillation has a dominant frequency and the amplitude increases with ship speed. The resonance oscillation mode can be piston or sloshing. In general, the sloshing mode dominates in longer moonpools, while piston mode oscillations are dominant in shorter moonpools. The global dimensions of the moonpool are an important design parameter from an operational perspective, as well as from a hydrodynamic viewpoint. In moonpool design practice, the length and width of a moonpool are derived from operational and structural requirements. The moonpool draft equals the draft of the vessel which follows from operational and stability requirements. In this paper, CFD based design is performed for a drillship to modify its moonpool configuration for minimizing the resistance without changing the global dimensions of the original moonpool.
CFD Study and Model Test Verification of Moonpool Configuration Modifications for Minimizing Drillship Resistance
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-06
25 pages
Article/Chapter (Book)
Electronic Resource
English
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