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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 55198 (08)
- University: Sharif University of Technolog
- Department: Mechanical Engineering
- Advisor(s): Seif, Mohammad Saeed
- Abstract:
- The study of maneuverability is very important in ship design. In the early stages of design, ship maneuvering is predicted with the help of mathematical models. The mathematical models used to simulate the maneuverability are relatively fast, but in this method, it is not possible to examine the exact details of the flow and the interaction between the hull and the propeller and rudder. Studying ship maneuvers in an experimental method is very accurate but also involves high costs. In recent years, with the advancement of technology, the use of computers and numerical methods has led to a good and accurate prediction of the ship's behavior during maneuverability. In this study, acceleration and stopping maneuvers are simulated to investigate the ship's trajectory for two ships, including a single-screw and a twin-screw ship with full appendages. Two methods are proposed to evaluate the maneuver, direct simulation using the computational fluid dynamics environment and the interaction between the hull and propeller, and the use of MATLAB software environment to apply maneuver equations. High-precision computational fluid dynamics method for performing direct ship maneuver simulations is presented in this dissertation. Simulation of direct acceleration and stop maneuvers requires the use of a propeller to generate thrust with a constant speed, for this purpose, first the ship self-propulsion test was studied both to find the propeller rotational speed and to verification and validate the results in different Froude numbers. Nnumerical validation and verification are performed based on the procedures proposed by the ITTC. A PI controller was used to obtain the self-propulsion point and the rotational speed of the propeller. Also, the results of the numerical simulation were compared with the available experimental results, and the self-propulsion parameters were compared with some available experimental data. After investigating the self-propulsion test and obtaining the rotational speed of the propeller from this test, the acceleration maneuver was examined, and the time when the vessel reached the design speed, the acceleration of the ship, the location of the ship at any time was investigated. In addition to changes in flow details such as the wave pattern, effective wake in the stern area was also carefully studied. On the other hand, after carefully examining the acceleration maneuver, the ship stopping maneuver has been studied by two methods of reversing the propeller and turning off the engine to examine the details of the ship behavior in the stopping maneuver. In the other part of the research, by compiling the equations of maneuver motion in MATLAB software environment and using the results obtained from the computational fluid dynamic environment, which includes good accuracy. It is possible to obtain acceptable accuracy from maneuver examination, and on the other hand reduced the solving time.
- Keywords:
- Stopping Maneuver ; Computational Fluid Dynamics (CFD) ; Self Propulsion Test ; Ship Propeller ; Matlab Software ; Acceleration Maneuver ; Dynamic Modeling ; Ship Motion
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