New moonpool design of drillship for operability improvement

[+] Author and Article Information
Seon Oh Yoo

Research Engineer, Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051

Hyun Joe Kim

Principal Research Engineer, Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051

Dong Yeon Lee

Director, Samsung Heavy Industries, 217 Munji-ro, Yuseong-gu, Daejeon 34051

Booki Kim

Adviser, Samsung Heavy Industries

Seung Ho Yang

Assistant Professor, Department of Naval Architecture and Ocean Engineering, Ulsan College, 57 Daehak-ro, Nam-gu, Ulsan 44610

1Corresponding author.

ASME doi:10.1115/1.4043237 History: Received August 08, 2018; Revised March 13, 2019


This study suggests three different designs of the moonpool to reduce the internal flow of the moonpool. The experimental and numerical studies were performed to improve the dillship's operability by the flow reduction in the moonpool. Based on the previous result of model tests in 2D wave flume, three different moonpool designs were proposed; Design-1) combination of forward recess deck, vertical bulkhead and beach-type wave absorber, Design -2) a step-type forward recess deck, and Design -3) a forward recess deck with beach-type wave absorber. Experimental study was carried out in the Offshore Engineering Basin for 87K compact drillship which was 87,000Mt as design gross tonnage. To verify the experimental results and clearly understand the internal flow of the drillship's moonpool, numerical study was carried out using RANS based CFD code. From these studies, it was found that all the proposed designs showed significantly reduced internal flow at resonance frequency compared to the original moonpool design of the target drillship, although the characteristic of internal flow reduction were different for each moonpool design. Additional studies were carried out to obtain the improved moonpool design that is expected to further reduce the internal flow of moonpool through CFD. Based on the results of three moonpool designs, the combined one with the step-type recess deck and the wave absorber presents best performance in the viewpoint of flow reduction in the moonpool.

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