统计Fluent生成的dpm文件信息，可以获取颗粒直径数量百分比 停留时间等信息 方便处理DPM文档生成文本文档统计信息(Fluent DPM Statistics Fluent generated DPM file information, you can get the particle diameter, number, percentage, residence time and other information, easy to handle DPM documents, gene