Modeling and simulation of droplet impact on an elastic beam based on FEM-SPH and SPH-SPH FSI methods

Droplet impact is a common physical phenomenon in the field of ocean engineering. During ship navigation, a large number of droplets are splashed, broken and fused. It can cause corrosion and impact to ship equipment. Therefore, it is necessary to study the droplet interactions, especially the droplet-solid interactions. In this manuscript, numerical models based on two different methods, FEM-SPH and SPH-SPH are proposed to simulate the process of droplet impacting on an elastic beam. In addition, continuum surface force model is added to consider the effect of surface tension on droplet motion. The robustness and correctness of the continuum surface force model are verified by simulating square droplet deformation and droplet fusion. The numerical model presented in the manuscript reproduces the phenomena and characteristics of deformation, diffusion, rebound and contraction during droplet impact, and reproduces the free vibration phenomenon of an elastic beam. The correctness of the numerical model is proved by theoretical formulations, experimental verification and mutual verification of the two methods.