Numerical Analysis of Oscillations of Flexible Strip Attached to Rigid Body in Compressible Viscous Flow via 3D Fluid-Structure Interaction Simulation

In this paper, oscillations of a thin high flexible strip attached to a three-dimensional body in viscous subsonic flow were simulated. The aim is to analyze the interactions of fluid and structure using a proper coupling algorithm that can couple the fluid and structure solvers and provide the proper data exchange between them. A computational fluid dynamics solver is used for fluid flow simulation and Euler-Bernoulli cantilevered beam model is used for structural analysis. For analyzing the fluid-structure interaction, iterative partitioned coupling algorithm is used for interrelation and data exchange between structure and fluid. Then, the results of vibration characteristics including the amplitude and frequency and forces and moments variations are presented with respect to different bending stiffness and strip masses. The simulation is done in 2D and 3D conditions which 3D case is for a cylinder and flexible strip attached to the bottom of the body. Results show that the developed framework captures the physics of fluid-structure interaction successfully. Also, parametric study shows that for the flexible thin strip attached to the end of the body in the specified regime of flow, three deformation types consist of static deformation, stable oscillations, and chaotic unstable oscillations will occur based on the strip characteristics.