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可是气体的扩散系数很小，靠扩散远远达不到10mg/m3的浓度. 之前试着用toposet设置了浓度为定值(10mg/m3)的面源，但扩散效果还是不明显。
你这个更像是设计问题。如果物理上靠扩散远远达不到10mg/m3的浓度，那应该靠对流的作用。具体效果如何，还取决于你的几何。只能建议更改几何看看在什么情况下效果最好。看起来像拓扑优化了。
