The Thin Barrier boundary condition models interior permeable walls, membranes, geotextiles, or perforated plates as thin permeable barriers. The Thin Barrier boundary condition can only be applied on interior boundaries.

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Enter a value or expression for the Thickness db (SI unit: m, the default is 0.1 m) and for the Permeability κb (SI unit: m2). The default Permeability κb uses the value From material. For User defined select Isotropic to define a scalar value or Diagonal, Symmetric, or Full to define a tensor value and enter another value or expression in the field or matrix.