A scalable model for complex flows

We describe a scalable parallel algorithm for numerical simulations of turbulent, radiative, magnetized, and reactive fluid + particle systems on message-passing, distributed-memory computers. Accurate simulation of such complex flows has applications in engine combustion, industrial pulverized coal burners, astrophysics, inertial confinement fusion, nuclear systems, and many other strategically and economically important areas. Our algorithm has been developed based on a widely-used combustion code KIVA-3, a plasma and radiation hydrodynamics code R-MHD, a classical particle dynamics code CMDT, and a discrete ordinates particle transport code TORT. The development is being done on the Intel Paragon with PVM and MPI extensions. We report high levels of parallel efficiency and scalability (up to 1024 nodes) for a baseline engine test case, using our current message-passing reactive and turbulent flow code. The three-dimensional extension of radiation magnetohydrodynamics component is still being worked at and we hope to report further progress in the future.