Run

There are two examples available for ExaMPM: free fall and dam break. For each, problem setup is set on the command line with the following inputs:

• physical cell size
• particles per cell (per dimension)
• halo size (number of cells)
• time step (dt)
• simulation time
• write frequency
• Kokkos device type (serial, openmp, cuda, hip)

As an example (running from wherever the code was installed):

./DamBreak 0.05 2 0 0.001 1.0 50 serial

This will run the second example with the Kokkos::Serial backend for 1000 time steps for a small (50,000 particle) system.

This problems simulates an initially static water column which only partially fills the domain with [0,0.4] in X, [0,0.6] in Z, and the entire Y domain filled, that then flows and eventually rests at the bottom of the domain in Z.

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ExaMPM can also be run with MPI (where the serial here only refers to the threaded parallelism):

mpirun -n 4 ./DamBreak 0.05 2 0 0.001 1.0 50 serial