C.H. Zhou and J.Q. Ai Mesh adaptation for simulation of unsteady flow with moving immersed boundaries International Journal for Numerical Methods in Fluids 72
In each adaptation period, the mesh is refined in the regions where the solution evolves or the moving bodies pass and is unrefined in the regions where the phenomena or the bodies deviate. There is no lag between mesh and solution, and the adaptation frequency can be controlled to reduce the errors due to solution transferring. The number of mesh nodes can be reduced greatly when using a nonboundary-conforming method to simulate complex moving-boundary flows.
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