For the Granular Flow interface, the grain trajectories must be computed using a Time-Dependent Solver. When modeling granular flow, it is common to utilize the results from one study step as the initial conditions for a subsequent study step with different physics features. For example, it is common to release grains and let them settle into a container before letting them flow or mix due to wall movements. This can be achieved by selecting the appropriate options in the Values of Dependent Variables section.

The Granular Flow interface only supports explicit time solver methods. The default time-stepping method is the second-order Classical Runge–Kutta method.