Code for effective heat conductivity in thin porous media

This code can be used to determine the effective heat conductivity of a thin periodic porous medium by solving a two- or three-dimensional local cell problem on pore scale using the software Netgen/NGSolve. The pore geometry of the representative cell and the boundary conditions on top and bottom can be set by the user. The same holds for the heat conductivities of fluid and grain as well as numerical parameters. All parameters are set in 'settings.py', together with four example set-ups that are already implemented there (for further instructions please refer to 'Notes').<br>
If needed one can display or export the solutions of the cell problems in vtk-format.

本代码可借助Netgen/NGSolve软件，通过求解孔尺度下的二维或三维局域胞元问题，计算周期性薄层多孔介质的有效导热系数。用户可自定义设置代表性胞元的孔隙几何形状，以及上下表面的边界条件；流体与固体骨架的导热系数、各类数值计算参数的设置方式亦保持一致。所有参数与四种已内置的示例配置均在`settings.py`文件中完成设置（更多操作说明请参阅`Notes`文档）。<br>如有需求，用户可将胞元问题的求解结果以VTK格式进行可视化展示或导出。