flexible flapping airfoil propulsion at low reynolds numbers

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flapping airfoil, the flow solver is parallel-implemented by MPI programming method. Unsteady computations are performed for low Reynolds number flows over a NACA four-digit series airfoils. Effects of pitching, plunging, and flapping motion with different reduced frequency, amplitude, thickness and camber on aerodynamic characteristics are
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An Experimental Study of Flexible Membrane Airfoils at Low ...
An Experimental Study of Flexible Membrane Airfoils at Low Reynolds Numbers Masatoshi Tamai1, Jeffery T. Murphy2, and Hui Hu3() Iowa State University, Ames, Iowa, 50011 An experimental study was conducted to explore the benefits of using flexible membrane airfoils/wings at low Reynolds numbers for MAV applications. In
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Low-speed aerodynamic characteristics of a 17 percent ...
Reynolds numbers, based on the airfoil chord, were varied from about 2.0 X lo6 to 20.0 X lo6. The results of the investigation indicate that maximum section lift coefficients increased rapidly at Reynolds numbers from about 2.0 X lo6 to 6.0 X lo6 and attained
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Numerical Study of Flexible Flapping Wing Propulsion
Numerical Study of Flexible Flapping Wing Propulsion ... two-dimensional NACA0012 airfoil is used as a model wing, and it is under active plunging ... At low Reynolds number regime, conventional ﬁxed-wing airplane suﬀers with low ﬂight eﬃciency and small .
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Flow simulations with ultra-low Reynolds numbers over ...
Numerical simulations of flow patterns at ultra-low Reynolds numbers over rigid and flexible airfoils and the influence of flexibility on main aerodynamic properties, are presented and discussed. Typical unsteady flights like heaving and flapping are, in terms of Reynolds and Strouhal numbers, reduced frequencies and FSI (Fluid Structure ...
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Effect of Reynolds Number on Aerodynamics of Airfoil with ...
3.2. Effect of Reynolds Number on Aerodynamics of the Airfoil without and with Gurney Flap. Computations are carried out for the airfoil without and with a GF of height of 3% chord at six different Reynolds numbers (Re = 3.0 × 10 5, 1.5 × 10 5, 1.0 × 10 5, 8 × 10 4, 5 × 10 4 and 3 × 10 4).Based on the equation for optimum GF given by Traub and Agarwal [], the optimum GF height varies ...
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Aerodynamics of Low Reynolds Number Flyers
3.3.1 Flexible Airfoils 92 3.3.2 Membrane-Wing Aerodynamics 94 3.4 Concluding Remarks 100 4 Flapping-Wing Aerodynamics 101 4.1 Scaling, Kinematics, and Governing Equations 102 4.1.1 Flapping Motion 102 4.1.2 Reynolds Number 106 4.1.3 Strouhal Number and Reduced Frequency 107 4.2 Nonstationary Airfoil Aerodynamics 109 4.2.1 Dynamic Stall 111
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Performance of flapping airfoil propulsion with LBM method ...
In this work, the performance of flapping airfoil propulsion at low Reynolds number of Re = 100–400 is studied numerically with the lattice Boltzmann method (LBM). Combined with immersed boundary method (IBM), the LBM has been widely used to simulate moving boundary problems.
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Preliminary Design and Computational Fluid Dynamic ...
Karman Street) that can form as fluid flows past a flapping NACA0012 airfoil, and S1223 airfoil at low Reynolds numbers and low velocities. These two airfoils have been selected and investigated by using basic computational fluid dynamics and fluid structure interaction modules. The S1223 airfoil, designed by University of Illinois at Urbana ...
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The Effects of a Flexible, Flapping Airfoil on Power ...
for propulsion. This technique can produce relatively high forces at relatively low Reynolds numbers. The modern study of flapping wing airfoil designs for both power extraction and thrust generation was ignited by researchers McKinney and DaLaurier [9] who in 1980 investigated the potential of an oscillating airfoil .
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Computation of Low Reynolds Number Flexible Flapping Wing ...
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The dynamic interaction of a flexible body with the surrounding flow at Low Reynolds numbers is studied in detail computationally using the unsteady incompressible Navier Stokes equations on moving and deforming overlapping grids embodied in the flow solver cgins/OverBlown.
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Airfoil Selection for Mars Rotor Applications
This research focuses on the airfoil performance at low Reynolds numbers and hopes to add to the work performed by Kroo et al.,1 Kunz and Kroo,2 Oyama and Fujii,3 Anyoji et al.,4–6 and others. LOW-REYNOLDS-NUMBER AIRFOIL PERFORMANCE McMasters and Henderson7 provide a summary of attainable airfoil lift-to-drag ratios over a
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Performance of flapping airfoil propulsion with LBM method ...
In this work, the performance of flapping airfoil propulsion at low Reynolds number of Re = 100–400 is studied numerically with the lattice Boltzmann method (LBM). Combined with immersed boundary method (IBM), the LBM has been widely used to simulate moving boundary problems.
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Aerodynamic efficiency of a bioinspired flapping wing ...
Mar 14, 2018· 2018 Aerodynamic efficiency of a bioinspired flapping wing rotor at low Reynolds number R. Soc. open sci. 5 ... 2005 Optimization of flapping airfoils for maximum thrust and propulsive efficiency. AIAA J. 43, 2329–2336. (doi:10.2514/1.816) Crossref, Google Scholar. 29. Heathcote S, Martin D, Gursul I. 2004 Flexible flapping airfoil propulsion ...
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Computation of Low Reynolds Number Flexible Flapping Wing ...
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The dynamic interaction of a flexible body with the surrounding flow at Low Reynolds numbers is studied in detail computationally using the unsteady incompressible Navier Stokes equations on moving and deforming overlapping grids embodied in the flow solver cgins/OverBlown.
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Flexible Flapping Airfoil Propulsion at Low Reynolds Numbers
Not Available adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
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Flexible flapping airfoil propulsion at low reynolds numbers
Flexible flapping airfoil propulsion at low reynolds numbers . ... and a Strouhal number of 0.29, which lies in the middle of the range observed in nature. ... The results suggest the effect of chordwise flexibility is beneficial for purely heaving airfoils at low Reynolds numbers Year: 2007. DOI identifier: 10.2514/1.25431 ...
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Flexible flapping airfoil propulsion at low reynolds ...
T1 - Flexible flapping airfoil propulsion at low reynolds numbers. AU - Heathcote, S. AU - Gursul, I. PY - 2007. Y1 - 2007. N2 - Water tunnel experiments on chord wise-flexible airfoils heaving with constant amplitude have been carried out for Reynolds numbers of 9,000 to 27,000.
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Flapping and Flexible Wing Aerodynamics of Low Reynolds ...
American Institute of Aeronautics and Astronautics 1 Flapping and Flexible Wing Aerodynamics of Low Reynolds Number Flight Vehicles Dragos Viieru1*, Jian Tang2†, Yongsheng Lian2‡, Hao Liu3§, and Wei Shyy2** 1University of Florida, Gainesville, FL, 32611, U.S.A. 2University of Michigan, Ann Arbor, MI, 48109, U.S.A. 3Chiba University, Chiba, Japan
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Propulsion by an Oscillating Thin Airfoil at Low Reynolds ...
Key words: Flapping wing propulsion, Low Reynolds number, Heaving wing, Pitching wing Summary. This paper describes an investigation of the mechanisms producing thrust for an airfoil performing a pitching or heaving motion in a low Reynolds-number ow (Re= 1000, based on chord length) by analysis of numerically ob-tained
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A Numerical Study of the Effects of Aerofoil Shape on Low ...
The SD7003 airfoil is designed for low bubble drag at low Reynolds numbers. Flow past the SD7003 airfoil and wing have been often considered as a research topic for different numerical and experimental studies since it exhibits an LSB on the upper surface that is present over a wide range of Reynolds numbers and angles of attack.
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Effects of time-varying flexibility on the propulsion ...
In this paper, we numerically investigate the effects of time-varying bending stiffness on the propulsion performance of a flapping foil using a fully coupled fluid-structure interaction model. The...
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Flexible flapping airfoil propulsion at low reynolds numbers
Flexible flapping airfoil propulsion at low reynolds numbers . ... and a Strouhal number of 0.29, which lies in the middle of the range observed in nature. ... The results suggest the effect of chordwise flexibility is beneficial for purely heaving airfoils at low Reynolds numbers Year: 2007. DOI identifier: 10.2514/1.25431 ...
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Improving the propulsion speed of a heaving wing through ...
Jan 30, 2019· 2010 Motor learning at intermediate Reynolds number: ... 2010 Resonance of flexible flapping wings at low Reynolds number. Phys. Rev. E 81, 056304. ... 2011 Reynolds number, thickness and camber effects on flapping airfoil propulsion. J. Fluids Struct. 27, 145–160.
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Low Reynolds Number Effect on Energy Extraction ...
Low Reynolds Number Effect on Energy Extraction ... for semi-passive system with NACA0015 airfoil at four different Reynolds numbers (Re = 5000, 10000, 20000 and 50000). The vortex structure, ... flapping airfoil. where θ(t) is the instantaneous pitch angle at time t.
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British Library EThOS: Flexible flapping airfoil ...
Flexible flapping airfoil propulsion at low Reynolds numbers Author: Heathcote, Francis ISNI: 0000 0001 3551 6814 Awarding Body: University of Bath Current Institution: University of Bath Date of Award: 2006 Availability of Full Text: ...
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Unsteady Aerodynamic Analysis of a 2D Flapping Airfoil ...
the unsteady aerodynamic analysis of 2D flapping airfoil (Lateral motion) is analysed by solving the 2D time-dependent incompressible Navier-Stokes equations for free stream velocity of 5 m/s which includes dynamic mesh techniques, user defined functions, low Reynolds number, flapping motion and .
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A Study of Aerodynamics of Low Reynolds Number Flexible ...
thrust, while the most flexible airfoil generates the most thrust at low frequencies. In this paper we investigate the flapping motion in a uniform stream that mimics the forward insect flight. Specifically, we investigate the airfoil of varying degrees of flexibility under different Reynolds number (9,000 and 100).
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[PDF] Forces on oscillating foils for propulsion and ...
Abstract Experiments were performed on an oscillating foil to assess its performance in producing large forces for propulsion and effective maneuvering. First, experiments on a harmonically heaving and pitching foil were performed to determine its propulsive efficiency under conditions of significant thrust production, as function of the principal parameters: the heave amplitude, Strouhal ...
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Numerical Study of Flexible Flapping Wing Propulsion
Numerical Study of Flexible Flapping Wing Propulsion Tao Yang∗ and Mingjun Wei† New Mexico State University, Las Cruces, New Mexico 88003 and Hong Zhao‡ University of Illinois at Urbana–Champaign, Urbana, Illinois 61801 DOI: 10.2514/1.J050492
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