The output intervals can be controlled by using the TIMES and STEPS entries. Please see this article for details about how to use these entries. (SimCompanion Login Required)

Yes, we can do parallel processing in Dytran. Dytran has two options for parallel processing: SMP (Share Memory Parallel) and DMP (Distributed Memory Parallel). The details about both options can be found here. (SimCompanion Login Required)

To model fluid-structure interaction (FSI) in Dytran, you can use either the general coupling or fast-coupling methods. The fast-coupling method is more efficient and requires an orthogonal Euler mesh. Key steps include defining the Euler domain, creating a coupling surface, and setting up the necessary parameters for interaction. You can find a step-by-step example for the same here.

The choice between Lagrangian and Eulerian methods depends on the specific requirements of your simulation. If you need detailed particle tracking and are dealing with small to medium deformations, the Lagrangian approach might be more suitable. On the other hand, if you're working with fluid flow or structural parts where very large deformation is expected, the Eulerian method could be more efficient and suitable.