The OpenMC project aims to provide a fully-featured Monte Carlo particle transport code based on modern methods. The project started under the Computational Reactor Physics Group at MIT.
If you are interested in the project or would like to help and contribute, please contact Paul Romano.
Building the executable for OpenMC is as easy as going to the src directory and running make. By default, the Makefile is set to use the GNU Fortran compiler, gfortran. This can be changed by the F90 variable in the Makefile.
Compiling with support for distributed-memory parallelism can be controlled with the MPI and MPI_DIR variables. The MPI_DIR variable should be set to the base directory of the MPI implementation installed on your computer.
OpenMC has been tested on Linux, Mac, and Windows platforms with Intel, GNU, IBM, Cray, and PGI compilers. It is recommended to use the latest version of whatever compiler you should choose to use as there are a number of Fortran 2003 and 2008 intrinsics that are used in OpenMC.
To run OpenMC after building, you'll need to write an input file according to the specifications in this documentation. With your input file complete, simply run:
openmc inputFile
where inputFile is the name of your input file. To run in parallel, use the mpiexec or mpirun script provided by your MPI implementation. Assuming this is on your PATH, you may run:
mpiexec -n numProcs openmc inputFile
where numProcs is the number of processors you desire to run on.