The Lattice Boltzmann based on single-phase method was used to simulate the free surface flow about the impingement of a liquid droplet onto a flowing liquid film.The fluid fraction,which equals to the mass divided by the density is used to tracking the movement of the free surface.The force induced by the phase interface between the gas and liquid acting on the liquid is added in the model for incorporating the surface tension.Numerical simulations were carried out for impingement of a droplet onto a moving liquid film with different velocity ratio(the velocity of the film divided by the velocity of the droplet) and the relative film thickness(the thickness of the film divided by the diameter of the droplet).By making a comparison between the theoretical and numerical result of a droplet impact onto a static liquid film,the flow phenomena and the intrinsic flow mechanism after a droplet impinging onto a flowing liquid film was analyzed.The rule of radial expansion and height variation of the crown’s rim as a function of time were obtained.The splash condition was also discussed.
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