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兄弟，这个是树木简化为多孔介质吧，这个比较简单，不要用UDF就能实现，直接采用多孔介质模型就可以了，就是需要转化一下，多孔介质模型所填的阻力系数=2*LAD*Cd。另外，兄弟，我也是在做这个，我想在多孔介质区域加一个附加项，考虑树木对例子的吸附，会吗？欢迎加我讨论QQ1225220118
