Thank you for your reply.
Based on my understanding, the simulation discussed in the link you provided may not closely match my problem, as there is no multiphase flow involved. My main challenge is to simulate water diffusion through a porous insulation layer. The temperature and water content at the outer boundary are assumed to be constant, and I need to determine the water content within the insulation layer. The inside temperature of the pipe is also known. If we adopt an axisymmetric approach, the problem can be represented as follows:
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