Droplet spreading occurs when a water drop hits the surfaces in a relatively low speed, which is a very important process in many applications (for example printing technologies and especially observation of diffusion of liquid state contaminant). This paper is aimed at analyzing contact angle and roughness, the two main factors’ effect on droplet spreading using SPH (smoothed particle hydrodynamics) method. When fluid-fluid and fluid-solid particle-particle interaction is added according to Alexandre Tartakovsky and Paul Meakin, surface tension and contact angle can be simulated. Line-shaped projections of different height are applied here as rough surfaces. The result shows two main effects of textured surface with different contact angle: unequal spreading in different direction and capillary phenomenon in the gap formed by the line-shaped projections.

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