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Hydrodynamic Study on Water Column Oscillation of Varying Cross-Section Moonpool and Its Effect on Resistance of a Drill Ship

[+] Author and Article Information
Sivabalan Ponnappan

Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India-600036.
siva_iitkgp@yahoo.co.in

Surendran Sankunny

Professor, Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India-600036.
sur@iitm.ac.in

1Corresponding author.

ASME doi:10.1115/1.4038396 History: Received August 25, 2016; Revised October 13, 2017

Abstract

A moonpool is meant for access to the underwater part of the ship from onboard. It is a vertical opening along the depth having an effect on the performance of the floating platform. Inside the moonpool, water motions in horizontal plane is called sloshing and in vertical planes it is called piston mode. Moonpool causes deck wetness and sometimes result in the downtime of the platform. It is the necessity of the operator to be at the safe conditions of platform facing varied environmental conditions. In the present study, vessel response in the region of moonpool resonance was investigated with different shapes of moonpool and comparison is made with Molin's (2001) theoretical and Fukuda's (1977) empirical formulas. It is seen that there is a shift in the frequency of resonance based on moonpool shapes. The effect of moonpool on the ship motion with forward speed is also attempted in this paper. Proven packages are used to calculate the calm water resistance of the ship with moonpool of various cross-sections. Wave making coefficient of the ship is modified due to opening to accommodate the moonpool. The openings to accommodate moonpool causes further entry of water both zero and non-zero Froude number especially in the presence of waves.

Copyright (c) 2017 by ASME
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