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This is a 2D fluid-structure interaction (FSI) problem. In this test, a structure pole (shell element) stands in the middle of a flow field and its bottom end is fixed. When a strong wind flows from left to right, it pushes the pole and forces it to deform. It is simulated by the dual CESE FSI-mmm solver (this FSI solver is based on the moving mesh method (mmm), and can be more accurate than the immersed boundary method (ibm) in capturing small deformation problems).