Numerical simulations are widely accepted for permeability measurements of fabric preforms used in liquid composite molding (LCM). The lack of research about interface conditions raises the question of the applicability and reliability of these conditions in the simulations of fluid flow through a porous medium. It is obvious that the well-known Navier-Stokes equation can safely be applied to the clear-fluid region though, for the porous region it is not yet well-established, what interface conditions can best accompany the Darcy and/or Brinkman governing equations. Hence, in this paper, these governing equations are employed, with some of the appropriate interface conditions to signify the variations of permeability results due to different mathematical parameters in a validated numerical model. Commercial software COMSOL is used for our simulations, and permeability measurement results for different interface conditions are presented and discussed. The numerical and experimental results are also compared for a woven fabric preform.

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