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1- PhD Candidate, Department of Mechanical Engineering, Sharif University of Technology
2- Professor, Center of Excellence in Hydrodynamics & Dynamics of Marine Vehicle, Sharif University of Technology
2- Professor, Center of Excellence in Hydrodynamics & Dynamics of Marine Vehicle, Sharif University of Technology
Abstract: (12 Views)
In the absence of reliable experimental data for the high-speed search and rescue vessel Naji-7, this study aims to develop a numerical method based on Computational Fluid Dynamics (CFD) to accurately estimate the vessel's hydrodynamic maneuvering coefficients. The core innovation lies in employing a mesh sensitivity analysis to determine the optimal mesh configuration at a Froude number of 1.19. This Froude number was selected as it corresponds to the vessel’s typical operational speed during rescue missions, making it representative of real-world maneuvering conditions. Initially, the two-dimensional hull lines were generated using AutoCAD, and a 3D model was constructed in SolidWorks. The model was then transferred to Maxsurf to extract hydrostatic properties and subsequently imported into STAR-CCM+ for CFD simulations. The mesh sensitivity analysis was performed across various mesh densities, and the optimal mesh was chosen based on resistance force convergence.Two categories of numerical tests were conducted: static and dynamic. The static tests included evaluation of lateral forces, yaw moments, trim, heel, wetted surface, pressure distribution, and wave pattern. In the dynamic tests, sway and yaw oscillations were simulated at five excitation frequencies (ranging from 0.05 to 0.4 Hz), and the corresponding forces and moments at peak velocity and acceleration were extracted. The speed- and acceleration-dependent hydrodynamic coefficients were then obtained through inverse solution of the governing equations of motion.Comparison with published experimental data on similar vessels demonstrated acceptable accuracy of the proposed method, with a mean error of less than 8% for forces and less than 12% for moments. The total computational time for all simulations was approximately 32 CPU Time on an 8-core system. This study provides a reliable and practical alternative for maneuverability analysis of high-speed vessels in the absence of experimental data and can effectively contribute to the safe and optimized design of search and rescue craft.
Keywords: Ship Maneuverability, Hydrodynamic Coefficients, Static and Dynamic Tests, High-Speed Vessel, Constrained Model Simulation
Type of Study: Research Paper |
Subject:
Ship Hydrodynamic
Received: 2025/07/8 | Accepted: 2025/08/23
Received: 2025/07/8 | Accepted: 2025/08/23
فایل صوتی چکیده مقاله [MP3 3217 KB] (3 Download)
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
International Journal of Maritime Technology is licensed under a
Creative Commons Attribution-NonCommercial 4.0 International License.