scholarly journals Hydrodynamic Characteristics of the Main Parts of a Hybrid-Driven Underwater Glider PETREL

10.5772/24750 ◽  
2011 ◽  
Author(s):  
Wu Jianguo ◽  
Zhang Minge ◽  
Sun Xiuju
Keyword(s):  
Hydrodynamic Characteristics ◽  
Underwater Glider

CFD Approach to Modelling Hydrodynamic Characteristics of Underwater Glider

2019 ◽  
Vol 2019 (4) ◽  
pp. 32-45
Author(s):  
Kamila Stryczniewicz ◽  
Przemysław Drężek
Keyword(s):  
Flow Behavior ◽  
Equations Of Motion ◽  
Vertical Plane ◽  
Dynamic Modelling ◽  
The Body ◽  
Hydrodynamic Characteristics ◽  
Motion Simulation ◽  
Underwater Glider ◽  
Lift And Drag ◽  
Equations Of Motions

Abstract Autonomous underwater gliders are buoyancy propelled vehicles. Their way of propulsion relies upon changing their buoyancy with internal pumping systems enabling them up and down motions, and their forward gliding motions are generated by hydrodynamic lift forces exerted on a pair of wings attached to a glider hull. In this study lift and drag characteristics of a glider were performed using Computational Fluid Dynamics (CFD) approach and results were compared with the literature. Flow behavior, lift and drag forces distribution at different angles of attack were studied for Reynolds numbers varying around 105 for NACA0012 wing configurations. The variable of the glider was the angle of attack, the velocity was constant. Flow velocity was 0.5 m/s and angle of the body varying from −8° to 8° in steps of 2°. Results from the CFD constituted the basis for the calculation the equations of motions of glider in the vertical plane. Therefore, vehicle motion simulation was achieved through numeric integration of the equations of motion. The equations of motions will be solved in the MatLab software. This work will contribute to dynamic modelling and three-dimensional motion simulation of a torpedo shaped underwater glider.

scholarly journals Numerical Study of the Effect of Wing Position on Autonomous Underwater Glider

2020 ◽  
Vol 70 (2) ◽  
pp. 214-220
Author(s):  
R.V. Shashank Shankar ◽  
Rajagopalan Vijayakumar
Keyword(s):  
Numerical Study ◽  
Reynolds Numbers ◽  
Hydrodynamic Characteristics ◽  
Underwater Glider ◽  
Low Reynolds Numbers ◽  
Underwater Gliders ◽  
Turning Motion ◽  
Computational Fluid Dynamics Cfd ◽  
Lift And Drag ◽  
Autonomous Underwater Glider

 Autonomous underwater gliders are a class of underwater vehicles that transit without the help of a conventional propeller. The vehicle uses a buoyancy engine to vary its buoyancy and with the help of the wings attached executes its motion. The hydrodynamic characteristics of the vehicle affect the longitudinal and turning motion. This paper discusses the effect of the wing’s position on the vehicle’s lift and drag characteristics. Computational fluid dynamics (CFD) tool is used to estimate the lift, drag, and pitching moment coefficients of the vehicle. The numerical methodology is validated using flow over NACA0012 wing results for low Reynolds numbers, and the results of CFD are discussed for possible application in estimation of glider motion.

scholarly journals Research on Hydrodynamic Characteristics of Blended Wing Body Underwater Glider with Rudder

2020 ◽  
Vol 38 (1) ◽  
pp. 24-30
Author(s):  
Yunlong Ma ◽  
Guang Pan ◽  
Qiaogao Huang ◽  
Jinglu Li
Keyword(s):  
The Body ◽  
Hydrodynamic Characteristics ◽  
Shape Design ◽  
Underwater Glider ◽  
Trailing Edge ◽  
Blended Wing Body ◽  
The Difference ◽  
Drag Ratio ◽  
Lift To Drag Ratio ◽  
Rudder Angle

In order to improve the maneuverability and stability of the Blended Wing Body (BWB) underwater glider, the trailing edge rudder is integrated into its shape design in this paper. Through the numerical simulation of CFD, the variation laws of the hydraulic parameters such as lift, drag, lift-to-drag ratio with the angle of attack and rudder angle are given. Compared with the traditional underwater glider, the BWB underwater glider not only has high loading capacity, but also has a maximum lift-to-drag ratio three times that of the former, resulting in higher energy efficiency. At the same time, by adding trailing edge rudders, the maneuverability of the BWB underwater glider is improved, and the lift-to-drag ratio under the same large rudder angle is increased by more than 30% compared with the variable-wing underwater glider. Finally, through the analysis of the numerical results and the cloud image, the difference interaction extent between the rudder and the body of the BWB underwater glider and the traditional torpedo or AUV is illustrated.

scholarly journals Effect of wing form on the hydrodynamic characteristics and dynamic stability of an underwater glider

2017 ◽  
Vol 9 (4) ◽  
pp. 382-389 ◽  
Author(s):  
Muhammad Yasar Javaid ◽  
Mark Ovinis ◽  
Fakhruldin B.M. Hashim ◽  
Adi Maimun ◽  
Yasser M. Ahmed ◽  
...  
Keyword(s):  
Dynamic Stability ◽  
Hydrodynamic Characteristics ◽  
Underwater Glider ◽  
Wing Form

scholarly journals Computational Fluid Dynamics Study of the Hydrodynamic Characteristics of a Torpedo-Shaped Underwater Glider

Fluids ◽  
2021 ◽  
Vol 6 (7) ◽  
pp. 252
Author(s):  
Thanh-Long Le ◽  
Duc-Thong Hong
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Energy Equation ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Hydrodynamic Characteristics ◽  
Underwater Glider ◽  
Navier Stokes Equations ◽  
Experimental Works ◽  
Drag And Lift

In this study, numerical computation is used to investigate the hydrodynamic characteristics of a torpedo-shaped underwater glider. The physical model of a torpedo-shaped underwater glider is developed by Myring profile equations and analyzed by the computational fluid dynamics approach. The Navier–Stokes equations and the energy equation coupled with the appropriate boundary conditions are solved numerically by using Comsol Multiphysics software. The numerical results contribute to the major part of reducing the effects of fluid flow on the glider’s profile and make the underwater glider more hydrodynamically efficient. The drag and lift forces acting on the underwater glider are enhanced by a higher velocity and a larger angle of attack of the underwater glider. Since the obtained results show a good observation with the experimental works, the need and the practicality of using CFD in the glider design process are proven.

MR-tomographic assessment of hemodynamic and hydrodynamic characteristics in migraine patients

2009 ◽  
Vol 40 (01) ◽  
Author(s):  
I Koerte ◽  
S Immler ◽  
N Alperin ◽  
C Schankin ◽  
C Grosse ◽  
...  
Keyword(s):  
Hydrodynamic Characteristics

Underwater Glider Networks for Adaptive Ocean Sampling

2003 ◽  
Author(s):  
Naomi Leonard ◽  
Clarence Rowley ◽  
Jerrold Marsden
Keyword(s):  
Underwater Glider ◽  
Ocean Sampling
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