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1- Mechanical Engineering Department, Shiraz University of Technology
2- Professor of mechanical engineering, Mechanical Engineering Department, Shiraz University of Technology
2- Professor of mechanical engineering, Mechanical Engineering Department, Shiraz University of Technology
Abstract: (81 Views)
Planing hull vessels have the potential to reach high speeds, which makes them particularly of great interest in marine studies. Seakeeping refers to the science of analyzing vessel motions in wavy seas and oceans and evaluating the impact of waves on various aspects related to the vessel. This study presents a numerical investigation into the seakeeping performance of a planing craft, with hull type DTMB 1-4667, under regular wave conditions, focusing on two degrees of freedom: heave and pitch motions. It is assumed that the fluid is incompressible and turbulent, and the effects of regular waves are modeled using a two-phase (air-water) flow approach. The analysis is conducted using ANSYS Fluent to solve the RANS equations, with the k-ω SST model employed for turbulence modeling and the Volume of Fluid (VOF) method used to track the free surface. Boundary conditions and mesh configurations are precisely defined, and grid sensitivity analysis and validation with experimental data are carried out, showing a maximum deviation of about 8% in drag force. Results indicate that increasing vessel speed and entering the planing regime leads to reduced response amplitude operators (RAOs) for heave and pitch, thereby improving seakeeping performance, although drag force and motion amplitudes increase moderately. Additionally, greater wave height and wavelength lead to increased motion amplitudes and slamming accelerations; however, the maximum recorded vertical acceleration in the worst-case scenario was 2.6g, which is below the acceptable limit of 4g for high-speed vessels. The main achievement of this study lies in the integration of precise numerical analysis, the comprehensive evaluation of various hydrodynamic parameters (including encounter frequency), and the detailed quantitative assessment of the vessel’s dynamic response under different sea states—providing valuable insights for optimizing the hull design of high-speed vessels and enhancing their safety and onboard comfort.
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