The dynamic behavior of a droplet on a solid surface is simulated by the lattice Boltzmann method (LBM) for two-phase fluids with large density differences; the wetting boundary condition on solid walls is incorporated in this simulation. By using the method, the dynamic behavior of a droplet impinging on a horizontal wall is investigated in terms of various Weber numbers. The dynamic contact angle, the contact line velocity, and the wet length are calculated, and found to be in good agreement with available experimental data. In addition, the method is applied to simulations of the collision of a falling droplet with a stationary droplet on a solid surface. The * Corresponding author. Tel.:+81 26 269 5116; fax:+81 26 269 5116.Email address: masato@shinshu-u.ac.jp (M. Yoshino) 1 Present address: Seiko Epson Corporation, Suwa-shi, Nagano 392-8502, Japan.
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