Numerical study of liquid-solid impact using Lagrangian-Eulerian coupling method

The fluid-structure interaction of a water droplet impact on a compressible solid has been studied. By using Lagrangian-Eulerian coupling method, the dynamics in water droplet and deformation in solid has been analyzed and discussed. It is shown that computational impact pressure on the central axis at the initial stage is in good agreement with theoretical prediction. The onset of jetting time is later than theoretical considerations and the incompressible stream line flow is not immediately established after the shock envelope overtakes contact periphery. The pressure at the contact periphery decreases gradually after shock wave departure. The deformation of solid is examined and found that the depression in the central impact area is considerably larger than the outer region. Comparisons with experimental observation show that the deformation simulated can account for the deformation patterns of metal in some way.