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      • Numerical Analysis of Flapping Wing

        Hiroaki Matsutani,Etsuo Morishita,Hisao Koyama,Takeo Okunuki 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-

        Micro Air Vehicles (MAVs) are very small and fly at low speeds. Therefore, their wings are flat plates or membranes because the Reynolds number is very low. For MAVs, a flapping wing is proposed to generate lift and thrust simultaneously like birds and insects. In this study, the Immersed Boundary Method with the original ideas is used to analyze the airflow around stationary, heaving and feathering flat-plate numerically. The advantages of this method are easiness of the grid generation and less amount of calculation. The grid is not body-fitted but rectilinear. And the plate is expressed by the external force. The computational results are compared with the analytical solutions and the experimental photo. In the stationary plate, the drag coefficient and the velocity distribution agree with the Blasius solution. In the heaving plate, the lift and moment coefficients are close to the analytical solution with the Theodorsen function. And the pressure contours and the streamlines show the plate exists in the grid. In the feathering plate, the vorticity distribution and the experimental result show the similar trend.

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