This open source program use the SPH meshfree algorithm to simulate fluidynamics problems. More information at http://wiki.manchester.ac.uk/sphysics/index.php/Main_Page

PySPH is an open source framework for Smoothed Particle Hydrodynamics (SPH) simulations. It is implemented in `Python <http://www.python.org>`_ and the performance critical parts are implemented in `Cython <http://www.cython.org>`_.