Abstract <p>The dynamics of a droplet impacting a planar solid substrate was captured through a comprehensive three-dimensional computational analysis. The ANSYS Fluent software was employed to implement the dynamic contact angle model in conjunction with the volume of fluid (VOF) technique. The simulation has been carried out for a single drop impact as well as drop-on-drop impact. The drop-on-drop impact study has been carried out in both coaxial and offset impact cases. The effect of offset has also been studied on the droplet evolution after impacting the sessile droplet resting on a solid surface. The evolution of droplet, including spreading, receding and bounce off, is found to be accelerated in the case of single droplet impact as compared to the coaxial drop-on-drop impact. It is observed that for the drop-on-drop impact, the combined droplet bounces off the surface earlier in the coaxial impact case. The spreading diameter reaches its maxima earlier at the higher offset values. The combined droplet gets detached from the surface at the lower offset value while it remains attached to the surface at the higher offset values.</p>