采用四参数生成法自动生成多孔介质(二维)，优化了出现独立单个节点、实体内部出现孔洞的问题-Four-parameter generation method automatically generates a porous medium, optimize the emergence of an independent single node, hole problems arise internal entities(2D)

运用随机四参数生成法形成多孔介质，可更改孔隙率(Using random four parameter generation method to form porous media, the porosity can be changed)