Unsteady CFD simulation of 3D AUV hull at different angles of attack

Ray, Sudipta; Chatterjee, Dipankar; Nandy, Sambhunath

doi:10.3329/jname.v13i2.25849

Cited by 3 publications

(2 citation statements)

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“…The hydrofoil's surface was all that the panel analysis method could analyse, but once the surface velocity was known, the potential flow theory could be used to calculate the flow velocity and direction, as shown in Figure 12. Each grid point is evaluated after the surface velocity distribution has been solved for [16,17].…”

Section: Rudder and Wing Patternmentioning

confidence: 99%

Resistance Evaluation for the Submerged Glider System using CFD Modelling

Ahmed

2023

ARASET

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The underwater gliders are type of autonomous underwater vehicles, which are in their way to be used instead of traditional propellers or thrusters. They are used as submerged gliders or as a part connected to floating hull which is propelled by it. The underwater system depends on different number of hydrofoils (underwater wings) that allow it to glide forward while descending through the water. This paper concentrates on three critical design details: profile of the wings, multiple flapping wings and their angle of attack (AoA), and a method is focused on the mesh generation to predict calm water resistance for the submerged glider system while considering the profile and the maximum rotating angle of the wings and rudder. Flow around submerged wing system model has been calculated at different Froude numbers ranging from 0.1 to 0.6. The grid generator is established for meshing the computational domain with structured hexahedral and unstructured tetrahedral grid. Simulations are carried out using commercial CFD code ANSYS Fluent 19 to calculate calm water resistance of the submerged glider system with different number of hydrofoils. The results conclude that the cambered plate was chosen to design the rudder at 19 o AOA and the hydrofoil NACA0012 can be practically applied in the design of the wings at 15 o AOA from the resistance point of view. In addition, this investigation introduces a new application for CFD calculations in estimating the resistance of the submerged glider system.

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Section: Rudder and Wing Patternmentioning

confidence: 99%

Resistance Evaluation for the Submerged Glider System using CFD Modelling

Ahmed

2023

ARASET

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“…In a CFD study, they analyzed the combined effect of the control surface deviation and also the angle of attack on the hydrodynamic forces applied to the Pirajuba automated underwater gliders [19]. Ray et al [20] evaluated the hydrodynamic characteristics of their gliders reaching speeds of up to 6 knots (3 m/s). In their research, the water flow velocity was different from the glider that reached up to 2 knots.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Hydrodynamic Properties of Alex Type Gliders

Divsalar

Shafaghat

Farhadi

et al. 2020

IJE

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This work presents a numerical Simulation of an underwater glider to investigate the effect of angle of attack on the hydrodynamic coefficients such as lift, drag, and torque. Due to the vital role of these coefficients in designing the controllers of a glider, and to obtain an accurate result, this simulation has been carried on at a range of operating velocities. The total length of the underwater glider with two wings is 900 mm with a 4-digits NACA0009 profile. The fluid flow regime is discretized and solved by computational fluid dynamics and finite volume method. Since the Reynolds number range for this study is in a turbulent flow state (up to 3.7e06), the κ-ω SST formulation was used to solve Navier-Stokes equations and continuity and the angles of attack ranging are from-8 to 8 degrees. The main purpose of this research is to study the effect of each of the dynamics parameters of glider motion such as velocity and angle of attacks on the hydrodynamic coefficients. Based on the results, the drag and lift coefficients are enhanced with increasing the angle of attack. In addition, the drag coefficient enhanced with increasing the velocity however, when the glider velocity is increased, the lift coefficient does not change significantly except at the highest angle of attack that decreases. The highest drag coefficient is 0.0246, which corresponds to the angle of attack of-8 and the Reynolds number of 3738184. In addition to simple geometry, the glider studied in this paper shows relatively little resistance to flow.

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