DIS (Dynamic Interactions Simulator) is a general-purpose finite element code. DIS was developed specifically to accurately simulate mechanical systems composed of multiple rigid and flexible components, fluid handling components, controllers, and body-connection element such as revolute and prismatic joints.

DIS has been successfully used to solve difficult design problems by both researchers and commercial engineers by accurately simulating multi-component mechanical systems, flexible space structures, space tethers, belt-drives, time-dependent fluid flow, and fluid-structure interaction.