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| Application of local domain-free discretization method to simulate flapping-wing flows |
| Received:July 10, 2012 Revised:September 26, 2012 |
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| DOI：10.7511/jslx201306011 |
| KeyWord:non-boundary-conforming method moving-boundary problem flapping-wing flow immersed boundary method unsteady flow |
| Author | Institution |
| 刘冠冕 |
南京航空航天大学 空气动力学系, 南京 ;中航通用飞机设计研究院, 珠海 |
| 周春华 |
南京航空航天大学 空气动力学系, 南京 |
| 艾俊强 |
中国航空工业集团第一飞机设计研究院, 西安 |
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| Abstract: |
| In this paper,the local domain-free discretization(DFD) method was applied to simulate flapping-wing flows.The flow variables at an exterior dependent point are evaluated by extrapolation along the wall normal direction,and the boundary conditions are imposed at the same time.Using this method,moving-boundary flows can be simulated on a fixed grid,and at each time step there is no need to update the grid to follow the motion of a body.We simulated flows over a wing-wing model of three flapping modes.The computed results of the time history of lift and drag coefficients agree well with experiment data in the literature and verify the reliability of the local DFD method for complex moving-boundary problems.Finally,a flow around wing-body combination was simulated,and vortex structures and flight mechanisms were analyzed in detail. |
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