A three-dimensional computational study of the aerodynamic mechanisms of insect flight.
A three-dimensional computational study of the aerodynamic mechanisms of insect flight.
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发表时间：
2002-05
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通讯作者：
R. Ramamurti;W. Sandberg
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作者：
R. Ramamurti;W. Sandberg
用有限元流动求解器计算了三维果蝇扑翼运动时的非定常绕流。推力和阻力的计算结果与先前的实验研究结果吻合较好。为了验证计算结果，进行了网格加密研究，得到了与网格无关的解。通过改变行程反转前的旋转运动，研究了平移运动和旋转运动之间的相位效应。观察到，当机翼旋转相对于冲程反转提前时，推力峰值高于机翼旋转与冲程反转同步时的推力峰值，而当机翼旋转延迟时，推力峰值进一步减小。正如前人所建议的，我们观察到转动机构是重要的，为了准确地描述扑翼的力时间历程和非定常气动力，平移机构和转动机构的组合是必要的。
A finite element flow solver was employed to compute unsteady flow past a three-dimensional Drosophila wing undergoing flapping motion. The computed thrust and drag forces agreed well with results from a previous experimental study. A grid-refinement study was performed to validate the computational results, and a grid-independent solution was achieved. The effect of phasing between the translational and rotational motions was studied by varying the rotational motion prior to the stroke reversal. It was observed that, when the wing rotation is advanced with respect to the stroke reversal, the peak in the thrust forces is higher than when the wing rotation is in phase with the stroke reversal and that the peak thrust is reduced further when the wing rotation is delayed. As suggested by previous authors, we observe that the rotational mechanism is important and that the combined translational and rotational mechanisms are necessary to describe accurately the force time histories and unsteady aerodynamics of flapping wings.