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arXiv 2102.08592math.NAcs.NAphysics.comp-ph
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基于POD-Galerkin方法和低阶准扩散方程的热辐射传输简化模型

Reduced-Order Models for Thermal Radiative Transfer Based on POD-Galerkin Method and Low-Order Quasidiffusion Equations

North Carolina State University(北卡罗来纳州立大学)

Joseph M. Coale, Dmitriy Y. Anistratov

AI总结:

本文提出一种新方法,通过POD分解光强获得全局基函数,用于求解时间依赖的多群玻尔兹曼传输方程的简化模型,并利用准扩散因子闭合非线性系统。

摘要:

本文提出了一种新方法,用于开发非线性辐射传输问题的简化模型。通过光强的POD分解获得全局基函数,用于多群玻尔兹曼传输方程的时间依赖性Galerkin投影(POD-Galerkin)。POD-Galerkin解用于确定准扩散(Eddington)因子,以闭合非线性系统(i)多级低阶准扩散(VEF)方程和(ii)材料能量平衡方程。数值结果展示了不同低秩近似光强的简化模型的准确性。

英文摘要:

This paper presents a new technique for developing reduced-order models (ROMs) for nonlinear radiative transfer problems in high-energy density physics. The proper orthogonal decomposition (POD) of photon intensities is applied to obtain global basis functions for the Galerkin projection (POD-Galerkin) of the time-dependent multigroup Boltzmann transport equation (BTE) for photons. The POD-Galerkin solution of the BTE is used to determine the quasidiffusion (Eddington) factors that yield closures for the nonlinear system of (i) multilevel low-order quasidiffusion (VEF) equations and (ii) material energy balance equation. Numerical results are presented to demonstrate accuracy of the ROMs obtained with different low-rank approximations of intensities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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