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research-article

EXPERIMENTAL AND NUMERICAL STUDY ON THE FLOW REDUCTION IN THE MOONPOOL OF FLOATING OFFSHORE STRUCTURE

[+] Author and Article Information
Seon Oh Yoo

Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051
seonoh.yoo@samsung.com

Hyun Joe Kim

Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051
hyunjoe.kim@samsung.com

Dong Yeon Lee

Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051
dy7.lee@samsung.com

Booki Kim

Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051
booki.kim@samsung.com

Seung Ho Yang

Assistant Professor, Department of Naval Architecture and Ocean Engineering, Ulsan College, 57 Daehak-ro, Nam-gu, Ulsan 44610
shyang@uc.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4040799 History: Received July 22, 2017; Revised July 01, 2018

Abstract

Recently, drillship moonpools are getting longer and wider for the higher operability. With this trend, violent internal flows are getting more concerned in terms of the safety and operability, which have been reported during the operations even in mild seas. Also, it is well known that the internal flow gives higher resistance during the transit of drillship. In this study, to see the effect of larger damping devices, a series of experimental and numerical study was carried out for the four moonpool designs; the ordinary plain moonpool, the moonpool with a recess deck, the moonpool with an isolated recess deck (island deck) and moonpool with a combination of island deck, splash plates and wave absorber. From the model tests, it was found that the internal flow of the moonpool was significantly reduced by the application of the wave absorber. In case of the moonpool with the island deck, the sloshing mode oscillations was not observed due to the gap flow between the inner wall of the moonpool and the recess. For the in-depth understanding of the flow behaviors and characteristics, the internal flow of the moonpool has been investigated using RANS based CFD code. The various moonpool designs were simulated to identify the effect of each device for the internal flow reduction of the moonpool. The CFD analysis results with regular waves, the water surface responses inside moonpool such as the flow pattern and resonance frequency, were compared with model test results and showed reasonably good agreements.

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