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All Journal Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan
Fuad Mahfud Assidiq
Departemen Teknik Kelautan, Fakultas Teknik, Universitas Hasanuddin, Indonesia
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Engineering Transportation

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Analisis Perubahan Karakteristik Aliran Fluida sekitar SPAR-3VP Terhadap Variasi Kecepatan Aliran di Kondisi Ekstrim Galy Rakaziwi; Fuad Mahfud Assidiq
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 1, March 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i1.31535

Abstract

This research discusses the SPAR offshore wind turbine, a floating foundation turbine used for wind power generation in the deep sea. SPARs are designed with a large-diameter vertical floating cylinder weighted at its lower end, creating a structure that is less responsive to wind, waves, and currents. SPAR foundations have advantages in deep water due to their low center of mass, simple ballast stabilization, and high stability. The purpose of this research is to gain a deeper understanding of the fluid flow occurring around the SPAR, which impacts the performance and stability of the offshore wind turbine. This research will focus on CFD (computational fluid dynamics)-based numerical modeling analysis with the help of 3D analysis software ANSYS by considering several variations of fluid flow velocity to identify the pressure, velocity, and changes in fluid flow around the SPAR. The results of this study are expected to help in reducing the risk of SPAR foundation damage, improving turbine stability, and overall increasing the efficiency of offshore wind energy generation. This research has positive implications for reducing the environmental impact of energy generation compared to traditional fossil fuel sources.
Analisa Perubahan Aliran Pada Model SPAR (4VP) Nurhikma Nurhikma; Fuad Mahfud Assidiq
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 1, March 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i1.31624

Abstract

Research on the flow around the SPAR model was carried out with the aim of finding out how much effect the flow has on the SPAR structure used in offshore wind turbines. SPAR is a type of floating structure that can usually be used in deep seas and is an effective and reliable structure in terms of construction. Spar has the advantage that the buoyancy point (KB) is above the gravity point (KG), thus providing good stability. However, there are still obstacles to the use of SPAR structures in the deep sea, especially when environmental conditions are extreme, where SPAR structures are not able to reduce currents at a certain speed level. Then, this research aims to test the SPAR model with a four vertical plate (4VP) configuration system which is then modeled using Computational Fluid Dynamics (CFD) based numerical modeling which aims to investigate the flow around the SPAR in terms of flow velocity. Especially at certain flow velocity levels, the velocity is chosen carefully at each level starting from: V1 = 0.611m/s, V2 = 6.114, V3 = 61.144, V4 = 611.438. The addition of vertical plates to the bottom construction of the SPAR has a role in dampening the flow and also turbulent effects due to current impacts.
Analisis Pengaruh Posisi Fairlead Terhadap Rasio Kerusakan Akibat Kelelahan Pada Struktur Tali Tambat Tipe Catenary FPSO Aoka Mizu Nur Indah; Fuad Mahfud Assidiq
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 1, March 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i1.31658

Abstract

This research discusses the effect of fairlead position on the fatigue damage ratio of the Aoka Mizu Floating Production Storage and Offloading (FPSO) catenary structure during moored conditions. The FPSO is subject to the influence of ocean waves, ocean currents, and wind that can cause significant movement, jeopardize the catenary mooring system, and disrupt the production process. This study utilizes a numerical method based on the Boundary Element Method and uses environmental data from the Masela Block, which includes wave, wind, and current data. Three variations of fairlead position (0.3T, 0.5T, and 0.9T), each referring to the fairlead distance from the laden to the ship's keel, were tested with a rope length of 3100 m and a sea depth of 1000 m. The results showed that a fairlead position of 0.3T resulted in low stress and damage levels, while fairlead positions of 0.5T and 0.9T resulted in higher stress and damage. The fairlead position plays an important role in determining the stability and performance of the FPSO catenary structure. A fairlead position of 0.3T appears to be the most favorable option to reduce the risk of damage and stress to the FPSO Aoka Mizu catenary mooring system during moored conditions.
Analisis Motion Trajectory dan Fatigue Damage Ratio FPSO Terhadap Catenary Mooring Line Failure Muhammad Alkhan Dwiki Abadi; Fuad Mahfud Assidiq
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 1, March 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i1.31700

Abstract

Floating Production Storage and Offloading (FPSO) is a ship that produces floating oil and gas by having a catenary mooring type mooring system. The FPSO will produce oil and gas in the Abadi Field in the Masela Block of the Arafuru Sea (09˚ 07' 51'' S / 130˚ 28' 00'' E) where the area has sea waves, wind and currents which will affect performance FPSO ship. In this research, Response Amplitude Operator (RAO), motion trajectory and fatigue damage ratio will be tested with a ship mooring system of 12 ropes, 3 of which experienced failure. The conclusion of this research is that the more mooring ropes break, the farther the FPSO ship will move from its initial condition and the higher the maximum rope tension value, it will be directly proportional to the stress range on each mooring rope, while for the fatigue damage ratio, the higher the failure cycle value. then it will be inversely proportional to the fatigue damage ratio value for each mooring rope.
Analisis Kondisi Aliran Fluida Dan Tekanan Di Sekitar Spar Dengan Sistem Redaman Lima Plat Vertikal Dimas Fitrawan; Fuad Mahfud Assidiq
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 1, March 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i1.31740

Abstract

Spar type Floating wind Turbine is a floating structure that utilizes the speed of the sea wind to drive a turbine that can generate electrical energy .SPAR is a cylindrical floating structure that has a deep draft and is reliable in operating in the deep sea for a long time.in this study using a SPAR model with a damping system of five vertical plates located at the bottom of the SPAR structure where in this study the analysis about fluid flow conditions and pressures that are around the SPAR.this study was conducted by calculation numerical based CFD (Computational Fluid Dynamics) with four variations of fluid flow velocity used to observe changes in fluid flow conditions and pressure around the SPAR.this study aims to observe the conditions and influences around the SPAR type floating wind turbine structure which is expected to be a solution to energy problems in the world.
Analisa Ketebalan Dan Stabilitas Pipa Bawah Laut Di Kawasan Kerja Blok Masela Pulau Yamdena Ahmad Faiq Dhiyaulhaq Karya; Juswan Sade; Fuad Mahfud Assidiq
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 5, Number 2, July 2024 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62012/zl.v5i2.35891

Abstract

Submarine pipeline is a transportation or concept used to transport hydrocarbon products such as crude oil and high-pressure natural gas. The fluid material or gas is pumped from the platform across the seabed using a pipeline. The Abadi Field in the Masela Block is one of the National Strategic Projects (PSN) located in the Tanimbar Islands Regency, Maluku Province. The block was developed by INPEX Masela Ltd. It geographically borders to Timor Leste and Australia. It was discovered in 2000 and contains potential gas reserves which reaching 10.73 trillion cubic feet (Tcf). This research aims to determine the minimum thickness of submarine pipelines, determine on-bottom stability in accordance with DNV RP-F109, and visualize the maximum pressure caused by significant current flow on the pipe surface by using Ansys Computational Fluid Dynamics 2023 R2 Student Version. This research method is used a quantitative. The analysis result of this research that have been obtained, the thickness of the pipe is 11.2 mm. The calculated of on-bottom stability is 0.012 for vertical and 0.008 for lateral stability. In Additionally, by using Ansys Computational Fluid Dynamics 2023 R2 Student Version, maximum pressure of the pipe is 14 Pa.
Co-Authors Ahmad Faiq Dhiyaulhaq Karya Dimas Fitrawan Galy Rakaziwi Juswan Sade Muhammad Alkhan Dwiki Abadi Nur Indah Nurhikma Nurhikma