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Determination of Flow Field Due to Clap and Fling Motion of a Rigid Flapping Wing Using LBM Simulation

Debopam Das


The primary focus of the present study is to investigate Clap & fling mechanism using immersed boundary coupled with Lattice Boltzmann method. The lattice Boltzmann Method, an alternative Navier Stokes solver based on the kinetic theory is used because of its simplicity and computational efficiency in solving complex moving boundary problems. Initially some benchmark problems are simulated, followed by the flow over a flapping wing for different Reynolds number. Two elliptic plates of aspect ratio 5 are made to perform clap and fling motion over a range of Reynolds number 75-150. The numerical method is able to capture various low Reynolds number unsteady phenomenon’s like wake capture, Kramer effect, LEVs etc. Our results show that lift is enhanced with increase in Reynolds number and decrease in lift & thrust coefficients with increasing advance ratio, which are consistent with the existing experimental studies.

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