We develop a sharp interface immersed boundary (IB) method to simulate the interactions between fluid flows and deformable moving bodies. Fluid-solid interfaces are captured using a level-set (LS) function, which is updated at every time step by a reinitialization procedure. Motions of solid bodies are dynamically coupled with fluid flows by calculating the fluid forces exerted on solid bodies. The accuracy and robustness of the LS-based IB method are tested systematically in the context of several benchmark cases and self-propelled fish swimming. The effects of computational parameters on the accuracy of deformable body capturing are analyzed. It is found that the algorithm performs well in simulating the flow motions surrounding the deforming and moving bodies.
Bibliographical noteFunding Information:
ZC and HJ would like to thank the Natural Science Foundation of China for its support (Award number 51275127) to this research. ZC also acknowledges the China Scholarship Council for sponsoring his visit to the University of Minnesota from October 2014 to October 2016.
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- Computational fluid dynamics
- fluid-structure interaction
- immersed boundary method
- level-set method