Infiltration of blast waves in a structure with limited opening in the front wall is investigated numerically.Numerical methods deal with generation of moving and deforming unstructured mesh,moving boundary condition and topological change of geometry are used to blast-structure interactions.Movements of door located at the opening,collision of door with a baffle,fracture of door and displacement of fragment are considered.It is concluded that the methods are suitable to deal with blast-structure interaction.