A5000999354- Ship Hydrodynamics and Maneuverability
- Fluid Dynamics Simulations and Interactions
- Maritime Navigation and Safety
- Marine and Coastal Research
- Cavitation Phenomena in Pumps
- Underwater Vehicles and Communication Systems
- Guidance and Control Systems
- Electromagnetic Launch and Propulsion Technology
- Spacecraft and Cryogenic Technologies
- Water Systems and Optimization
- Real-time simulation and control systems
- Hydraulic and Pneumatic Systems
- Fluid Dynamics and Vibration Analysis
- Maritime Transport Emissions and Efficiency
Agency for Defense Development
2019-2024
The influence of sweep angles on cavitation characteristics and mechanisms a wedge-section hydrofoil is investigated experimentally numerically. Four hydrofoils with 0° (straight), 30°, 45°, 60° are considered across range numbers from 2.00 to 0.48 angle attack (AOA) 0°, 5°, 10°, 15°. Two high-speed cameras used visualize the flow in tunnel. numerical simulation conducted using unsteady Reynolds-averaged Navier–Stokes equations through OpenFOAM. At an AOA vortex first appears wake region all...
The hydrodynamic derivatives are necessary for assessing the dynamic characteristics, such as stability and maneuverability which crucial in evaluating navigation safety operational efficiency. Hence, it is required to compute precisely. This study nominates new empirical formulae predicting of a submarine. proposed derived from forces moments measured using Computational Fluid Dynamic (CFD) approach. Because BB2 generic submarine designed with an appropriate geometry outstanding features,...
To enhance the operational stability of submarines, this study compared three pitch limit protection systems based on reference model, potential function, and dynamic trim algorithm. The performances depth were validated through maneuvering simulations submarine. proposed modifies command a comparison between desired calculated by outer-loop controller limit. designed protections modify so that inner-loop does not exceed simulation results confirmed effectiveness methods, with algorithm...
In this study, we developed an inviscid model to predict the shape of supercavitation in a wide range Froude numbers (Fr) based on potential theory suggested by Logvinovich (1973). Visualization experiments were carried out cavitation tunnel, and shapes obtained for 15 < Fr 30. Existing data supercavity at high number (100 400) used verify model. As result, cavity predicted with accuracy because rise is weak due relatively low buoyancy. case (15 30), within 5–10% from cavitator 2/3 total...
This paper describes the results of development submarine Free Running Model (FRM). First, goal was set based on test conditions and environment, system obtained accordingly. The target submarine, Joubert BB2 selected with a scale 18.35 in accordance goal. In order to conduct FRM underwater, where communication is impossible, must operate at least semi-autonomously. For this purpose, an Extended Kalman Filter (EKF) underwater integrated navigation control using sailplane X-shaped sternplane...
A practical cavitator design method for straight-running-type supercavitating torpedoes was developed in this paper. Design requirements were first drawn terms of torpedo performance characteristics, such as maximum range and motion stability. This determines the optimum satisfying that not only minimize total drag torpedo, extending range, but also provide hydrodynamic forces required straight level flight. The procedure includes determining a cavitation number type (disk or cone) obtaining...