Abstract
An efficient large-deformation fluid-structure interaction (FSI) model with GPU parallel framework is presented to simulate flow induced oscillation of an elastic slender structure, even light-weight and high-rigidity structures. A grid refinement and asynchronous advancement strategy is developed to ensure the matching of the different time-steps and grid sizes by flexibly coupling the fluid solver of a multi-direct forcing immersed boundary method (IBM) and the structure solver of a geometrically accurate Euler-Bernoulli beam model. This strategy can achieve good numerical stability and improve the computational performance of the present model. Free falling of a flexible pendulum, uniform flows around a stationary cylinder, and the flow induced oscillation of a flexible filament are simulated to validate the accuracy and capability of the structure solver, the fluid solver, and the coupled model, respectively. The results show that the present model can predict the large-displacement and large-deformation coupled responses of the elastic boundary. Also, the present model can obtain near 100 of acceleration ratio compared with the corresponding CPU version. Further, the effects of the density ratio and the bending coefficient on the flapping mode, the motion trajectory, and the fluid field are examined.
Published Version
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