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3 results for “Clap-and-fling”
Data set for bionic simulation of double clap-and-fling wing mechanism with SPH FSI method
<p>Data set containing the rigid-body based flapping wing models coupled with smoothed particle hydrodynamics (SPH), by means of <a href="https://github.com/DualSPHysics/DualSPHysics/wiki/9.-New-in-DualSPHysics#new-in-dualsphysics-v50">DualSPHysics version 5.0 </a>and <a href="https://projectchrono.org/download/">Project Chrono</a>.</p><p>These models are part of the paper:</p><blockquote><p>Yanwei Zhang, Zhonglai Wang, Saullo G. P. Castro. Bionic simulation of double clap-and-fling wing mechanism with SPH FSI method. EngXriv Preprint, 2022. <a href="https://doi.org/10.31224/2652">DOI: 10.31224/2652</a></p></blockquote><p>File "simulations.zip" contains the simulation files.</p><p>File "DualSPHysics_v5.0.zip" contains the compiled DualSPHysics software.</p><p>Procedure to run the simulations on a Windows machine:</p><ul><li>Working directory: .\simulations\flappingwing\case01</li><li>Step 1: Obtain rigid bodies by modeling of SOLIDWORKS and Macro command of FreeCAD (e.g. external_wing111.stl)</li><li>Step 2: Run ".bat" file (e.g. flapping01.bat) to start simulation and force acquisition</li><li>Step 3: Revise ".bat" and ".xml" (e.g. flapping01.bat and flapping01_Def.xml)to adapt to the next case. If required, change the model and Macro command of step 1. Common modification items:</li></ul><p><geometry>-<definition> <floatings>- <floating><angularvel> <floatings>- <floating><property> <properties>-<propertyfile> <initials> <execution>-<special>-<chrono> <execution>-<special>-<inout> <parameters> </p><ul><li>Step 4: Run "Filter.m" to handle force data by filters. Step 5: Compare forces of all cases. PS: Other files are revised function files derived from DualSPHysics 5.0.</li></ul><p> </p><p>Abstract: Three-dimensional numerical simulations of flexible flapping wings based<br>on the fluid-structure interaction in biological and bioinspired flow have become a<br>vibrant and challenging research topic. The present paper focuses on a parametric<br>study of the aerodynamic performance of a bionic flexible clapping wing. The proposed<br>model deforms the wing in spanwise and chordwise directions based on the six rigid<br>bodies connected along the wing veins using ball links and springs. Unsteady effects of<br>flapping wing micro air vehicles with a double clap-fling configuration are investigated<br>using an air-solid interaction model based on smoothed particle hydrodynamics and<br>rigid multi-body dynamics. A validation experiment determined the convergence<br>conditions and computational model accuracy. The proposed numerical model is<br>evaluated in terms of flexible variation law and aerodynamic performance. The results<br>indicate that the flapping frequency, angle of attack, and wind velocity significantly<br>influence the lift. Furthermore, increasing the frequency will monotonically expand<br>the maximum and time-averaged lift curve values. When the angle of attack is less<br>than 30 ◦, the influence on the time-averaged and maximum lift is proportional to the<br>angle of attack. When the angle of attack is larger than 45 ◦, a stall-like condition<br>is detected. To broaden the applicability of the present findings, a dimensionless<br>parameter, reduced frequency, is defined, and its influence on the maximum and time-<br>averaged lift is investigated. This parametric study shows that as the reduced frequency<br>increases, the maximum and time-averaged lift increases and then decreases. The<br>present study could reach a modeling framework that better explains the clapping<br>wing aerodynamics.<br> </p>
Data from: Clap-and-fling mechanism in a hovering insect-like two-winged flapping-wing micro air vehicle
This study used numerical and experimental approaches to investigate the role played by the clap-and-fling mechanism in enhancing force generation in hovering insect-like two-winged flapping-wing micro air vehicle (FW-MAV). The flapping mechanism was designed to symmetrically flap wings at a high flapping amplitude of approximately 192°. The clap-and-fling mechanisms were thereby implemented at both dorsal and ventral stroke reversals. A computational fluid dynamic (CFD) model was constructed based on three-dimensional wing kinematics to estimate the force generation, which was validated by the measured forces using a 6-axis load cell. The computed forces proved that the CFD model provided reasonable estimation with differences less than 8%, when compared with the measured forces. The measurement indicated that the clap and flings at both the stroke reversals augmented the average vertical force by 16.2% when compared with the force without the clap-and-fling effect. In the CFD simulation, the clap and flings enhanced the vertical force by 11.5% and horizontal drag force by 18.4%. The observations indicated that both the fling and the clap contributed to the augmented vertical force by 62.6% and 37.4%, respectively, and to the augmented horizontal drag force by 71.7% and 28.3%, respectively. The flow structures suggested that a strong downwash was expelled from the opening gap between the trailing edges during the fling as well as the clap at each stroke reversal. In addition to the fling phases, the influx of air into the low-pressure region between the wings from the leading edges also significantly contributed to augmentation of the vertical force. The study conducted for high Reynolds numbers also confirmed that the effect of the clap and fling was insignificant when the minimum distance between the two wings exceeded 1.2c (c = wing chord). Thus, the clap and flings were successfully implemented in the FW-MAV, and there was a significant improvement in the vertical force.
Data from: Clap-and-fling mechanism in a hovering insect-like two-winged flapping-wing micro air vehicle
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