To run FieldConvert in parallel the user needs to compile Nektar++ with MPI support and can employ the following command
mpirun -np <nprocs> FieldConvert --npt <nprocs> test.xml \ in/test\_<n>.fld out/test\_<n>.vtu
mpirun -np <nprocs> FieldConvert --npt <nprocs> test.xml \ in/test\_<n>.fld out/test\_<n>.dat
replacing <nprocs> with the number of processors and <n> by the starting time
index. FieldConvert will then process in parallel time solutions test_<n>.dat to
test_<n>+<nprocs>.dat.