porous media case for fluent

应用于流体力学FLUENT软件中的UDF接口，对出口边界的气固两相质量流率及各组分浓度进行统计，并部分用作为入口边界条件。-Applied to fluid dynamics FLUENT software UDF interface on the exit boundary of gas-solid mass flow rate and species concentration statistics, and partially used as inlet boundary conditio