An improved changing-topology moving mesh method in OpenFOAM

In this paper, an improved changing-topology moving mesh method is developed in OpenFOAM (a widely used CFD software) to solve the moving boundary problem. We use mesh smoothing and edge swapping to improve the mesh quality, together with edge bisection and edge contraction to control the mesh resolution. In order to increase the mesh motion efficiency, a local refinement algorithm is realized. In addition, to ensure the regenerated mesh quality is higher than the original mesh, an improved checking algorithm is implemented during the mesh motion. The effectiveness of our method is demonstrated by simulations of the NACA0012 airfoil with translation, rotation and fish-like undulating locomotion.