Numerical investigation of hydrodynamic forces acting on a flexible pitching filament

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  • This study investigates the pitching motion of an elastic filament flapping in a uniform laminar flow. The Lattice Boltzmann Method (LBM) as the fluid solver and the Lattice Spring Model (LSM) as the solid structure solver are employed to solve filament motion in the flow. The LBM and LSM are both mesoscopic models based on the kinetic theory. However, their emergent behavior captures the continuum properties of the system. The boundary force effects on the near fluid nodes are calculated using Immersed Boundary Method (IBM). The mutual behavior of the flow and deformable filament has been examined in a channel to understand the role of flexibility, oscillation frequency, and pitching amplitude on lift and drag coefficients. It can be inferred from the results that the lift coefficient (CL) is mainly affected by pitching amplitude (θ0), and its fluctuation amplitude showed significant values while θ0 equals 3° and 5°. In contrast, changing the frequency has a negligible effect on CL. Moreover, the drag coefficient (CD) increases with the frequency until it reaches the maximum amount at 0.13; afterward, it decreases sharply. In addition, lower pitching amplitude causes a higher CD. Considering the rigidity effects, the results revealed that increasing rigidity does not always coincide with a reduction in the filament's ending fluctuation. The filament's end tends to have an increase in oscillation amplitude when the non-dimensional rigidity number exceeds 0.01.

    Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022

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    Attribution-NonCommercial 4.0 International