Two methods(SPH and ALE) are used to simulation of droplets impacton PMMA.Deformation of droplets and failure of PMMA are compared.It shows that the surface failures in two methods agree with Brunton's experiment.Feasibility and accuracy of two methods are proved.SPH method shows better ability in simulating liquid-solid impact.Then,a rain ball impact the edge of airscrew of a flying aircraft is analyzed with SPH method.Two engineering techniques are proposed to protect integrity of airscrew.

The analytic solution for anisotropic steady state heat conduction is applied to analyse the anisotropic rectangular cantilever plate with one edge of nonuniformed boundary temperature and other edges of convection at the first time.The effect of piy angle on the temperature distributions is discussed.With the increasement of the anisotropic angle,the gradient of temperature in the plate is increased.Numerical results show there is the lowest gradient of temperature in the cantilever plate with 0° anisotropic angle.