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

Abstract

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

MARPLE: software for multiphysics modelling in continuous media

“…In the code MARPLE, a ray tracing technique based on rational numbers arithmetics is implemented [24,25]. The rational numbers arithmetics [26] leads to a considerably more time-consuming algorithm compared to traditional floating-point arithmetic.…”

Radiation transport in quasi-one-dimensional model of the ionizing gas flows in the plasma accelerator channel

“…1. Схема КСПУ Модель радиационной магнитной газодинамики (РМГД) включает: 1) систему уравнений магнитной газодинамики [1,4,12,13], 2) модель переноса излучения [14][15][16][17][18][19][20][21][22][23][24], и 3) модель поуровневой кинетики [25].…”