The discrete system Green’s function (DSGF) method is a fluctuational electrodynamics-based numerical framework for predicting near-field radiative heat transfer (NFRHT) between three-dimensional thermal sources of arbitrary number, shape, size, and material. In the DSGF method, thermal sources are discretized into cubic subvolumes along a cubic lattice, and the system Green’s functions between all subvolumes are obtained by solving a system of linear equations. From the system Green’s functions, quantities of interest in heat transfer such as the power dissipated and the thermal conductance are calculated. The objective of this paper is to provide a user guide of the DSGF solver publicly available on GitHub. The basics of the DSGF method are first reviewed, followed by a detailed description of the DSGF solver implemented in MATLAB and C. The C implementation is parallelized and includes an iterative procedure which is not available in the MATLAB version. Example problems of NFRHT between two dipoles, two spheres, two cubes, and two membranes that can be used for verification are provided.

中文翻译：

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用于近场辐射传热的 DSGF 求解器：用户指南


离散系统格林函数 (DSGF) 方法是一种基于波动电动力学的数值框架，用于预测任意数量、形状、尺寸和材料的三维热源之间的近场辐射传热 (NFRHT)。在DSGF方法中，热源沿着立方晶格被离散成立方子体积，并且通过求解线性方程组获得所有子体积之间的系统格林函数。根据系统格林函数，可以计算热传递中感兴趣的量，例如功耗和热导。本文的目的是提供在 GitHub 上公开的 DSGF 求解器的用户指南。首先回顾了 DSGF 方法的基础知识，然后详细描述了用 MATLAB 和 C 实现的 DSGF 求解器。C 实现是并行化的，并且包括 MATLAB 版本中不可用的迭代过程。提供了可用于验证的两个偶极子、两个球体、两个立方体和两个膜之间的 NFRHT 示例问题。