GeoXPM output tutorial

@tienlk2004 does a timestep of dt is always of 0.001 s or I can change it based on the critical timestep factor?

@madelestin timestep is dynamic based on material properties. You will see the timestep printed on the output log when running the simulation. Else you can find the log where you save the project in _out folder Run.out file (open with any text editor)

I suggest you read one of the paper in the reference page. The formulation for calculating the timestep together with other equations and parameters for SPH is there