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All Journal Applied Science and Technology on Naval Engineering
Fakhri Akbar Ayub
UPN Veteran Jakarta
Energy Engineering Mechanical Engineering Other

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Studi Dampak Perairan Dangkal terhadap Gaya Lateral (Sway Force) dan Momen Berputar (Yaw Moment) Kapal Rico; Fakhri Akbar Ayub
Applied Science and Technology on Naval Engineering Vol 3 No 2 (2025)
Publisher : Fakultas Teknik UPN Veteran Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54378/astne.v3i2.11786

Abstract

This study investigates the influence of restricted waters on the sway force (Y’H) and yaw moment (N’H) acting on a ship. We performed simulations using Computational Fluid Dynamics (CFD) on a 1:40 scale KRISO Container Ship (KCS) model, varying ship speed, water depth (1.3T and 1.6T), and drift angle (2°–10°). The simulation results indicate that both Y’H and N’H increase significantly as the water becomes shallower and the drift angle becomes larger. This phenomenon is attributed to the pressure imbalance around the ship's hull, caused by flow confinement. These findings are anticipated to provide valuable insights for safer and more efficient ship maneuvering, especially in narrow and shallow waterways. Keywords: restricted waters; bank effect; sway force; yaw moment; CFD
Optimalisasi Efisiensi Turbin Arus Laut Horizontal untuk Mendukung Kebutuhan Energi di Kawasan Pesisir Larantuka Indana Zulfatun Nikmah; Fakhri Akbar Ayub
Applied Science and Technology on Naval Engineering Vol 3 No 2 (2025)
Publisher : Fakultas Teknik UPN Veteran Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54378/astne.v3i2.11789

Abstract

This study aims to evaluate the energy conversion efficiency of Horizontal Axis Tidal Turbines (HATT) by varying blade length and angle of attack (AoA), and to assess their potential application in the coastal region of the Larantuka Strait. Numerical simulations were performed using Computational Fluid Dynamics (CFD) across nine turbine configurations to determine torque and power coefficient (Cp). The turbine with a 1 m blade and 10° AoA achieved the highest Cp value of 0.68. Meanwhile, the turbine with a 2 m blade and the same AoA, despite having a slightly lower Cp (0.66), produced the highest annual energy output of 737,619.7 kWh. With a net power output of 140.65 kW, approximately four units of this turbine are required to supply around 10% of Larantuka’s annual electricity demand. The selection of the optimal turbine model is based on a multi-objective approach that balances efficiency and energy output. These findings highlight the strong potential of tidal turbines as a renewable energy solution in eastern Indonesian coastal areas.
Ship Manuvering Analysis Using Virtual Captive Model Test On Trim And Sinkage Variations Audi Razif Santoso; Fakhri Akbar Ayub
Applied Science and Technology on Naval Engineering Vol 4 No 2 (2026)
Publisher : Fakultas Teknik UPN Veteran Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54378/astne.v4i2v2.05

Abstract

This study evaluates the effect of trim and sinkage variations on ship hydrodynamic characteristics using the Virtual Captive Model Test (VCMT) based on Computational Fluid Dynamics (CFD) for the KRISO Container Ship (KCS) model. Simulations were conducted for sinkage variations of −0.00090, −0.00275, and −0.00599 and trim variations of 0.017°, 0.053°, and 0.097°, over drift angles ranging from 2° to 10° under two speed conditions represented by Froude numbers 0.152 and 0.163. The objective is to investigate the influence of trim and sinkage on lateral force (sway) and yaw moment and to determine hydrodynamic coefficients using the Least Squares regression method. The results show that trim and sinkage influence sway force and yaw moment, although their effects are smaller than those of speed and drift angle. Increased sinkage generally produces higher sway force and yaw moment due to increased wetted surface area and changes in hull pressure distribution, while trim mainly alters the longitudinal pressure distribution with relatively limited influence within the investigated range. The maximum nondimensional values of Y′ and N′ were obtained at Fr = 0.163 and a drift angle of 10° (Y′H = 0.206543 and N′H = 0.079192 for sinkage variation; Y′H = 0.202338 and N′H = 0.073965 for trim variation). The hydrodynamic forces and moments were nondimensionalized using the Yoshimura–Masumoto formulation and analyzed through Least Squares regression, yielding coefficients that agree well with the simulation results. The VCMT-based CFD approach combined with Least Squares regression provides an effective alternative for determining ship maneuvering hydrodynamic coefficients.
Co-Authors Audi Razif Santoso Indana Zulfatun Nikmah Rico