Mean flow characteristics of two-dimensional wings in ground effect

Jung, Jae-Hwan; Yoon, Hyunsik; Hu, Chun; Hung, Pham Anh; Elsamni, Osama A.

doi:10.3744/jnaoe.2012.4.2.151

Cited by 5 publications

(3 citation statements)

References 11 publications

(10 reference statements)

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“…The turbulence is modeled by the realizable k − ε model. 33,34 The setting of calculation zone, boundary conditions and coordinate axis of numerical simulation in this study are shown in Figure 8. The fixed two-dimensional Cartesian coordinate system is adopted.…”

Section: Methodsmentioning

confidence: 99%

Numerical study on aerodynamic characteristics of two-dimensional propulsive wing in cruise and hover

Wang

et al. 2022

International Journal of Micro Air Vehicles

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The propulsive wing vehicle is a new concept vehicle, which is driven by a cross-flow fan (CFF) embedded in the trailing edge of the wing. The propulsive wing vehicle is capable of cruising and hovering at high angles of attack with very high aerodynamic force coefficients, and has the potential to become a new type of vertical take-off and landing (VTOL) vehicle. The cruise and hover states of the propulsive wing vehicle are defined, and a numerical model of the two-dimensional propulsive wing is established. Based on the computational fluid dynamics (CFD) method, the rotation of the CFF is simulated by using the sliding mesh technique. The effects of cruise speed, angle of attack and CFF rotation speed on the aerodynamics of the two-dimensional propulsive wing are evaluated, and the mechanism of the propulsive wing flow field changes is revealed. The results show that the propulsive wing has a very high lift coefficient of up to 60 at low speed and high angle of attack cruise, and a high thrust coefficient of up to 40 at low speed and small angle of attack cruise. The aerodynamic force of the propulsive wing fluctuates periodically with the rotation of the CFF, and the amplitude of the fluctuation is related to the vorticity of the CFF blade shedding vortex. In hover, the flow field of the propulsive wing is affected by the geometry and wake deflection into an asymmetric distribution, forming a vortex on each side of the airfoil, and the vortex diameter varies with the CFF rotation speed, which in turn has an impact on the hovering performance of the propulsive wing.

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Section: Methodsmentioning

confidence: 99%

Numerical study on aerodynamic characteristics of two-dimensional propulsive wing in cruise and hover

Wang

et al. 2022

International Journal of Micro Air Vehicles

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“…Recently, authors and coworkers (Jung et al, 2012) numerically investigated the aerodynamic characteristics of 2D wings in the vicinity of the ground by solving 2D steady incompressible Navier-Stokes equations with the turbulence closure model. In addition, they studied the effects of Reynolds number, and showed that the lift-to-drag ratio increases linearly with an increasing Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Endplate effect on aerodynamic characteristics of three-dimensional wings in close free surface proximity

Jung

Kim

Yoon

et al. 2012

International Journal of Naval Architecture and Ocean Engineeri

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We investigated the aerodynamic characteristics of a three-dimensional (3D) wing with an endplate in the vicinity of the free surface by solving incompressible Navier-Stokes equations with the turbulence closure model. The endplate causes a blockage effect on the flow, and an additional viscous effect especially near the endplate. These combined effects of the endplate significantly reduce the magnitudes of the velocities under the lower surface of the wing, thereby enhancing aerodynamic performance in terms of the force coefficients. The maximum lift-to-drag ratio of a wing with an endplate is increased 46% compared to that of wing without an endplate at the lowest clearance. The tip vortex of a wing-with-endplate (WWE) moved laterally to a greater extent than that of a wing-without-endplate (WOE). This causes a decrease in the induced drag, resulting in a reduction in the total drag.

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“…Kayiem and Chelven (2011) presented the aerodynamic characteristics of NACA4412 airfoil using FLUENT software and experimental measurements in low speed wind tunnel from Ϫ4°to 8°in ground effect. Also, Jung et al (2012) investigated aerodynamic characteristics of NACA4406 airfoil using FLUENT software. They found that the maximum lift coefficient increases considerably as the wing approaches the ground.…”

Section: Introductionmentioning

confidence: 99%

A practical method for aerodynamic investigation of WIG

Seif

Dakhrabadi

2016

Aircraft Eng & Aerospace Tech

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Purpose – The purpose of this paper is to present a fast, economical and practical method for mathematical modeling of aerodynamic characteristics of rectangular wing in ground (WIG) effect. Design/methodology/approach – Reynolds averaged Navier–Stokes (RANS) equations were converted to Bernoulli equation by reasonable assumptions. Also, Helmbold’s equation has been developed for calculation of the slope of wing lift coefficient in ground effect by defining equivalent aspect ratio (ARe). Comparison of present work results against the experimental results has shown good agreement. Findings – A practical mathematical modeling with lower computational time and higher accuracy was presented for calculating aerodynamic characteristics of rectangular WIG effect. The relative error between the present work results and the experimental results was less than 8 per cent. Also, the accuracy of the proposed method was checked by comparing with the numerical methods. The comparison showed fairly good accuracy. Research limitations/implications – Aerodynamic surfaces in ground effect were used for reducing wetted surface and increasing speed in high-speed marine and novel aeronautical vehicles. Practical implications – The proposed method is useful for investigation of aerodynamic performance of WIG vehicles and racing boats with aerodynamic surfaces in ground effect. Originality/value – The proposed method has reduced the computational time significantly as compared to numerical simulation that allows conceptual design of the WIG crafts and is also economical.

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Mean flow characteristics of two-dimensional wings in ground effect

Abstract: The present study numerically investigates the aerodynamic characteristics of two-dimensional wings in

Cited by 5 publications

References 11 publications

Numerical study on aerodynamic characteristics of two-dimensional propulsive wing in cruise and hover

Numerical study on aerodynamic characteristics of two-dimensional propulsive wing in cruise and hover

Endplate effect on aerodynamic characteristics of three-dimensional wings in close free surface proximity

A practical method for aerodynamic investigation of WIG

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