The Ground Effect in Anguilliform Swimming. [PDF]
Biomimetics (Basel), 2020 Some anguilliform swimmers such as eels and lampreys swim near the ground, which has been hypothesized to have hydrodynamic benefits. To investigate whether swimming near ground has hydrodynamics benefits, two large-eddy simulations of a self-propelled anguilliform swimmer are carried out—one swimming far away from the ground (free swimming) and the ...
Ogunka UE +3 more
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A Simulation Framework for Aircraft Take-Off Considering Ground Effect Aerodynamics in Conceptual Design [PDF]
Aerospace, 2023 The development of novel aircraft concepts and propulsion technologies requires up-to-date physics-based methods and tools for conceptual aircraft design.
Karim Abu Salem +3 more
doaj +2 more sources
Porous ground treatments for propeller noise reduction in ground effect. [PDF]
Sci RepAbstract This study investigates the aerodynamic and aeroacoustic behavior of propellers operating in ground-effect conditions, with an emphasis on the impact of porous ground surface treatments. The investigation explores the potential of porous materials to reduce propeller noise near the ground, a major barrier to the acceptance and ...
Kamliya Jawahar H +3 more
europepmc +5 more sources
Research on Ground Effect of Ducted Fans of VTOL UAVs
水下无人系统学报, 2023 In recent years, ducted fans, as a kind of propeller with excellent performance, have been widely used in various vertical take-off and landing(VTOL) unmanned aerial vehicles(UAVs). However, there is less research on its ground effect in China. Therefore,
Yu ZHOU, Weizheng CHEN
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Revising of the Near Ground Helicopter Hover: The Effect of Ground Boundary Layer Development
Applied Sciences, 2021 The interaction of a helicopter rotor with the ground in hover flight is addressed numerically using a hybrid Eulerian–Lagrangian CFD model. When a helicopter takes off or lands, its wake interferes with the ground.
Theologos Andronikos +3 more
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Aerodynamic analysis of an AK-47 bullet moving at mach 2.0 in close proximity to the ground [PDF]
FME Transactions, 2022 The bullet is shot near the wall or the ground during urban warfare. This nearness leads to a pressure distribution on the bullet's entire body, which is asymmetric.
Gholap Tanmay B. +4 more
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Aerodynamic Effects of Ceiling and Ground Vicinity on Flapping Wings
Applied Sciences, 2022 The combined ceiling and ground effect on the aerodynamics of a hovering flapping wing is investigated using numerical simulations. In the simulations, the wing was located between the ceiling and the ground.
Xueguang Meng +4 more
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Safety analysis of rotors in ground effect [PDF]
Aerospace Science and Technology, 2021 In this work, computational fluid dynamics was used to support safety analyses of rotors operating in ground effect. Initially, the research focused on the evaluation and prediction of the outwash generated by a hovering micro-rotor, and time-averaged outflow velocities were compared with experimental results. Then, using scaling factors, the simulated
Federico Rovere +2 more
openaire +2 more sources
Investigation of Ground Effect on the Beamforming of the Glide Path Altitude Adjustment Navigation System [PDF]
فناوری در مهندسی هوافضا, 2021 The Glide Path altitude adjustment system is one of the tools of the landing navigation system (ILS) that helps the airplane to find its angle related to the runway by sending radio signals.
Zahra Davoodabadi farahani +2 more
doaj +1 more source
Influence of Aerodynamic Characteristics of Airfoil Forward Flight Considering Step-Type Ground
Shanghai Jiaotong Daxue xuebao, 2023 The aerodynamic influence of ground effects during forward flight is difficult to ignore, especially when there is a sudden change in the ground structure.
XU Xiaogang, ZHANG Yang, CHANG Min, CHEN Gang
doaj +1 more source