Abstract:
Background With the advance and deeper understanding of ICF theory and experiments, more and more 3D features, like three-dimensional holhraum geometry and laser arrangements, are must be considered into the radiation hydrodynamics simulation, thus necessitating 3D integrated code for simulating the whole ICF process. However, numerical algorithm on 3D unstructured and distorted meshes can not be inherited from the legacy 1D/2D code, furthermore, the demonstration of integrated multi-physics simulation capacity is challenging due to the nonlinear evolution and coupling of ICF physical process.
Purpose In this paper, we introduce the 3D radiation hydrodynamic code, namely the LARED-3D integration code, developed by Institute of Applied Physics and Computational Mathematics (IAPCM). The goal is to show our tremendous attempt to design high accurate algorithms on 3D unstructured hexahedral meshes for multiple ICF physical process and realize the 3D ICF hohlraum integration simulation for understanding the experiments even with some 3D features quantitatively.
Methods LARED-3D integration code is modelling based on the radiation hydrodynamics with several key physical packages. As for the hydrodynamic package, for avoiding the breakdown due to extremely distorted meshes, we design robust and efficient rezoning and remapping algorithms with the divide-conquer strategy and reasonable mesh quality indicator. As for the radiation package, we design second-order algorithms for (an)isotropic thermal conduction equation and robust preconditioned iterative solver for multi-group radiation transfer equation without deadlock risk in usual transport sweep methods. The operator-split method is used to couple these physical packages, and some proper pre-post process package is used for tackling the 3D modeling and physical analysis.
Results Simulation results of benchmark examples for the hydrodynamic package, radiation package, and some typical ICF experiments are given. Through the analysis of these benchmark examples and simulation results of experiments on Shenguang-100kJ facility, we have verified and validated our 3D LARED-integration code capability of simulating the whole process of ICF holhraums, even with extra 3D features.
Conclusions The physical process of ICF holhruam can be simulated with 3D LARED-integration code quantitatively, which show its potential application for simulating ICF experiments regarding of the holhraum energetics and drive asymmetry and laser-plasma interaction accounting for more realistic experiment conditions.
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