Parallel ray tracing algorithm for radiation field analysis and pinhole imaging of radiative gas

Abstract:

An original algorithm was developed for ray tracing across unstructured 3D grid, and grid-characteristic computation of radiative energy transfer using MPI parallel technique and grid decomposition. The developed algorithm provides accounting the anisotropy of the radiation field in complex multiscale 3D magneto hydrodynamic simulations. The algorithm is implemented as a C++ code. Accurate rational calculations are applied for the intersection of rays with grid elements. Tracing of different rays within a single MPI-process is carried out in parallel with the use of OpenMP threads. Acceleration and scalability of the implemented algorithms were investigated including a comparison with other solvers within MHD code. Proposed applications are considered.

Keywords:

ray tracing, unstructured 3D grid, radiation transport, high-temperature plasma simulations, magneto hydrodynamics, rational calculations, integers of unlimited range, MPI, OpenMP