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No seepage velocity when using volume-ratio dependent permeability curve

    • April 30, 2026 at 6:04 am
      1819614500
      Subscriber

      Hello, everyone. I am using MAT63 to model water seepage in porous media with the *MAT_ADD_PERMEABILITY keyword. According to the manual, this permeability model can incorporate a permeability vs. volume ratio curve. However, when I use a volume ratio dependent curve (PMTYP=1), the simulation yields no seepage velocity, and the pore pressure distribution does not obey Darcy's law. If I set a constant permeability (PMTYP=0), everything works fine.

      Why might this happen? Is MAT63 not able to compute the volume ratio correctly, or am I misusing *ADD_PERMEABILITY?

      Any insights or debugging advice would be greatly appreciated!

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