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我试图在 COMSOL 中模拟一种流体侵入充满另一种流体的管道。流体被认为是不可压缩的并且流动层流。我运行时间相关的相流、相场模拟。然而,在结果中,我得到流体 1 的体积分数始终等于 1。我想看到流体 1 逐步侵入流体 2。