The experimental determination of the coefficient of hydraulic resistance of a perforated plate with a layer of balls adjoining to it Yu V Smorchkova, A N Varava, A V Dedov et al. Abstract. The shock/blast waves generated due to explosions cause wide spread damage to the objects in its path. Different techniques have been used to attenuate shock wave over pressure, to reduce the catastrophic effects. Perforated plates can be used effectively to attenuate the shock wave pressure. In this paper shock wave interaction with perforated plates is simulated using COMSOL multiphysics software. The pressure drop varied from 43.75% to 26% for porosity varying from 10% to 40.