Fluid-solid coupled dynamic simulations of flexible parachute based on ANCF and SPH
For the dynamic problem of the coupled fluid-structure between the parachute and air flow,and compared with the classic method,the Absolute Nodal Coordinate Formulation(ANCF)can overcome the strong coupling prob-lem of elastic deformation and rigid deformation.In this paper,the method of ANCF is used to build up a mechanical model of flexible parachute rope and canopy.In addition,as the method of Smoothed Particle Hydrodynamics(SPH)can capture the fast-moving interface and free surface when the flow field is greatly deformed,SPH is adopted to simu-late the air flow field.The coupling effect between fluid particles and flexible structures is described through the spring-damping model.Fluid-structure coupling dynamics is then conducted to investigate the dynamic behaviours of the flex-ible parachute.Through the numerical examples,it is found that with the increase of the speed of the fluid,the effec-tive projected area of the parachute is decreased slightly,whereas the variation amplitude of the effective projected area is increased significantly.The findings of this paper are useful for the design of flexible parachutes.
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