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6th International Conference in Mechanical Engineering Research, ICMER 2021

作者： Ahmad Fuad, Ahmad Faizal Said, Mohd Hafizi Samo, Khalid Mohd, Mohd Hairil Alias, Fatin Rahman, Mohd Asamudin A. Nautical Science Programme Faculty of Maritime Studies Universiti Malaysia Terengganu Kuala Nerus Terengganu Terengganu 21030 Malaysia Maritime Technology and Naval Architecture Programme Faculty of Ocean Engineering and Technology & Informatics Universiti Malaysia Terengganu Kuala Nerus Terengganu Terengganu 21030 Malaysia

ISBN: (纸本)9789811914560

Subsea pipeline is prone to the damage due to fishing activities. Bottom trawling is one of the threats to the pipeline integrity. Fishermen used bottom trawling method to catch large volume of fish and benthic along the trawl route on the seabed. This causes the trawl net to be stuck on the subsea pipeline if their activity is close to the oil and gas platform. This paper evaluates the risk of subsea pipeline fish trawling operations on the east coast of offshore Peninsular Malaysia. On-site surveys were used to establish the characteristics of trawling devices used by local trawlers in the region. Based on site survey that was conducted, the frequency of fish trawlers crossing the pipelines is estimated. The pull-over load estimate for the otter board was determined using the Det Norske Veritas Germanischer Lloyd (DNVGL) algorithm. The severity and frequency index of the risk matrix was developed based on literature review. The findings showed that the pull-over load of otter board would not damage the pipelines. The risk presented to the pipelines by the operations of fish is considered low and moderate. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Risk assessment

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Scouring Around Rigs-to-Reefs Jacket Platform with Different Sitting Configurations on Seabed 6th

Scouring Around Rigs-to-Reefs Jacket Platform with Different...

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6th International Conference on Mechanical Engineering Research, ICMER 2021

作者： Rahman, Mohd Asamudin A. Mohd, Mohd Hairil Fitriadhy, Ahmad Nazri, Muhammad Nadzrin Kasiman, Erwan Hafizi Alias, Fatin Maritime Technology and Naval Architecture Programme Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu Terengganu Kuala Nerus21030 Malaysia School of Civil Engineering Faculty of Engineering Universiti Teknologi Malaysia Johor Skudai81310 Malaysia

ISBN: (纸本)9789811915765

The decommissioning of offshore platforms is becoming more popular due to the lack of productive fields and the unpredictability of oil prices. The Rigs-to-Reef (RTR) program, which is part of the oil and gas company’s decommissioning method, involves turning jacket platforms into artificial reefs. This program creates shelter for marine life and subsequently increases marine production. However, the sediment scours around the jacket platform are one of the problems to be concerned about because it will result in RTR program failure. In this study, the seabed profile around the jacket platform was investigated using Computational Fluid Dynamic (CFD). The simulation of the seabed scour and the deposition around, were conducted using different arrangements of jacket platform. The results showed that the flow velocity decreased when the flow was obstructed in front of the jacket platform. A horseshoe vortex occurred, then developed in front of the cylinder. The flow accelerated on the opposite side of the jacket structure, causing significant scour around the structure as well as bed shear stress. Finally, the vertical jacket platforms showed a significantly lower scour and deposition than the horizontal position. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Computational fluid dynamics

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Numerical Simulation on VIV Energy Harvesting of Four Cylinders in Close Staggered Formation with Different Mass Ratios 7

Numerical Simulation on VIV Energy Harvesting of Four Cylind...

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7th International Conference on Mechanical Engineering Research 2023, ICMER 2023

作者： Alias, F. Zailani, N.S.A.M. Mohd, M.H. Kasiman, E.H. Rahman, M.A.A. Maritime Technology & Naval Architecture Programme Faculty of Ocean Engineering Technology & Informatics Universiti Malaysia Terengganu Terengganu Kuala Nerus21030 Malaysia Institute of Oceanography and Environment Universiti Malaysia Terengganu Terengganu Kuala Nerus21030 Malaysia Faculty of Civil Engineering Universiti Teknologi Malaysia Skudai Johor81310 Malaysia

Nowadays, the demand for marine renewable and clean energy from fluid flow in the oil and gas industry has made electricity the most sought-after and indispensable source of uncontrollable power worldwide. Vortex-Induced Vibrations (VIV) energy harvesting is a promising technology in harnessing energy from flowing water bodies. This study focuses on numerically investigating the VIV of rigid circular cylinders as a sustainable energy source, utilizing a Vortex-Induced Vibration Aquatic Clean Energy (VIVACE) converter to harvest energy from the ocean. Specifically, the research explores the vibration behavior of closely arranged cylinders with different mass ratios, both at low and high values. The study aims to understand the effects of mass ratios on the VIV converter's performance with four cylinders in close staggered formation. The power conversion of the VIV energy converter model with varying mass ratios (ranging from 2.36 to 12.96) is thoroughly examined, with simulations conducted at a Reynolds number of 82000. The results demonstrate that the maximum converted power peaks at 7.48 W for a mass ratio of 2.36, whereas a higher mass ratio of 12.96 only yields 4.33 W. This emphasizes the significant impact of lower mass ratios in enhancing the power generation from VIV. Overall, the findings of this research provide essential insights to optimize the layout of VIVACE converters in a close staggered array, facilitating the efficient harvesting of energy from flowing water bodies for sustainable and clean energy resources. © Published under licence by IOP Publishing Ltd.

关键词： Circular cylinders

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Investigating the motions' characteristics of a towed barge in extreme heading wave

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IOP Conference Series: Earth and Environmental Science 2021年第1期799卷

作者： Suandar Baso Ahmad Fitriadhy Andi Dian Eka Anggriani Andi Ardianti Rosmani Andi Mursid Nugraha Department of Naval Architecture Faculty of Engineering Hasanuddin University Jalan Poros Malino KM.6 Bontomarannu 92172 Gowa Sulawesi Selatan Indonesia Programme of Maritime Technology School of Ocean Engineering Universiti Malaysia Terengganu 21030 Kuala Terengganu Terengganu

A towed barge is one of the typical sea transportation systems that is basically composed of towing and towed ships connected to each other by a tow rope. During a towing operation exposed to rough sea condition, the risk of collision and breakage of a tow rope may be high and the consequences serious. This paper describes an experimental investigation of a towed barge's motions in heading waves. The effects of various lengths and the configuration of tow ropes incorporated with various loading conditions of the towed barge have been taken into account. Here, three tow-rope lengths were used, namely 1L, 1.5L, and 2L; meanwhile, the two tow-rope configurations i.e., Straight-Tow (ST) and V-Tow (VT) models were applied and incorporated with 50% and 100% of the loading conditions of the towed barge. Regardless of the tow-rope models of ST and VT, the results revealed that the towed barge's motion responses were generally proportional to the increase of the towline lengths and the towed barge's loading conditions. It should be noted here that the VT model with 1L tow rope length in the full loaded condition has less RAO of her heave and pitch motions as compared to the other towing arrangements. Merely, this research investigation provides very useful guidance on a ship towing navigation in waves.

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