Numerical Study of the Aerodynamic Forces and Flow Physics of a Delta Wing in Mutational Ground Effect

2018 ◽  
Author(s):  
Yunpeng Qin ◽  
Peiqing Liu ◽  
Qiulin Qu ◽  
Yunlong Zheng ◽  
Ramesh K. Agarwal
Keyword(s):  
Delta Wing ◽  
Numerical Study ◽  
Ground Effect ◽  
Aerodynamic Forces ◽  
Flow Physics

DDES study of the aerodynamic forces and flow physics of a delta wing in static ground effect

2015 ◽  
Vol 43 ◽  
pp. 423-436 ◽  
Author(s):  
Yunpeng Qin ◽  
Qiulin Qu ◽  
Peiqing Liu ◽  
Yun Tian ◽  
Zhe Lu
Keyword(s):  
Delta Wing ◽  
Ground Effect ◽  
Aerodynamic Forces ◽  
Flow Physics

Numerical Study of Dynamic Ground Effect of a Carrier-Based UAV

2015 ◽  
Vol 733 ◽  
pp. 522-525
Author(s):  
Mu Qing Yang ◽  
Dong Li Ma
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Aerodynamic Force ◽  
Numerical Study ◽  
Ground Effect ◽  
Pitching Moment ◽  
Aerodynamic Forces ◽  
Sliding Mesh ◽  
The Stability

The paper uses computational fluid dynamics combined with sliding mesh and dynamic layering methods to study the dynamic ground effect of a UVA during the phase of takeoff. The research focused on longitude characteristics, such as lift, drag and pitching moment. Results showed that the aerodynamic force would vibrate acutely, which affected the stability of the UAV and the safety of takeoff. Pitching angle is the most important factor influencing the aerodynamic forces. Increase the pitching angle properly is benefit to the safety of takeoff operation.

Numerical Study on Aerodynamics and Flow Physics of a Flapping Wing Hovering in Ground Effect

2019 ◽  
Author(s):  
Qiulin Qu ◽  
Lianchao Xu ◽  
Peiqing Liu ◽  
Yunlong Zheng ◽  
Ramesh K. Agarwal
Keyword(s):  
Numerical Study ◽  
Ground Effect ◽  
Flapping Wing ◽  
Flow Physics

scholarly journals A chordwise offset of the wing-pitch axis enhances rotational aerodynamic forces on insect wings: a numerical study

2019 ◽  
Vol 16 (155) ◽  
pp. 20190118 ◽  
Author(s):  
Wouter G. van Veen ◽  
Johan L. van Leeuwen ◽  
Florian T. Muijres
Keyword(s):  
Flight Control ◽  
Numerical Study ◽  
Force Production ◽  
Aerodynamic Forces ◽  
Rotational Force ◽  
Wing Motion ◽  
Forward Stroke ◽  
Insect Wings ◽  
Force Mechanism ◽  
Numerical Parametric Study

Most flying animals produce aerodynamic forces by flapping their wings back and forth with a complex wingbeat pattern. The fluid dynamics that underlies this motion has been divided into separate aerodynamic mechanisms of which rotational lift, that results from fast wing pitch rotations, is particularly important for flight control and manoeuvrability. This rotational force mechanism has been modelled using Kutta–Joukowski theory, which combines the forward stroke motion of the wing with the fast pitch motion to compute forces. Recent studies, however, suggest that hovering insects can produce rotational forces at stroke reversal, without a forward motion of the wing. We have conducted a broad numerical parametric study over a range of wing morphologies and wing kinematics to show that rotational force production depends on two mechanisms: (i) conventional Kutta–Joukowski-based rotational forces and (ii) a rotational force mechanism that enables insects with an offset of the pitch axis relative to the wing's chordwise symmetry axis to generate rotational forces in the absence of forward wing motion. Because flying animals produce control actions frequently near stroke reversal, this pitch-axis-offset dependent aerodynamic mechanism may be particularly important for understanding control and manoeuvrability in natural flyers.

Numerical study of the aerodynamics of a NACA 4412 airfoil in dynamic ground effect

2014 ◽  
Vol 38 ◽  
pp. 56-63 ◽  
Author(s):  
Qiulin Qu ◽  
Xi Jia ◽  
Wei Wang ◽  
Peiqing Liu ◽  
Ramesh K. Agarwal
Keyword(s):  
Numerical Study ◽  
Ground Effect
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