A two-dimensional code was developed to simulate vortex shedding characteristic and flow-structure interaction (FSI) of plate-type structures. In the code the physical component boundary fitted coordinate (PCBFC) was used to deal with the curve boundary. The arbitrary Lagrangian Eulerian (ALE) method was used to realize the grid movement. A barrier unit idea was adopted to deal with the boundary of fluid domain and solid domain in the code. The code was validated by comparing the numerical simulation results with experimental data. It was found that the vortex shedding phenomena in case of rectangular cylinder are strongly related to the length of the rectangular cylinder in the stream line.

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