A method of improving a 2D or 3D multiblock-structured mesh of an object that moves through a fluid medium, such as an aircraft, which is used in the design of said object in connection with a defined analytical scheme, said mesh having being generated with rectangular (2D) or hexahedral (3D) blocks under constrains that may cause that the mesh include irregular blocks (31) comprising the following steps: finding irregular blocks (31) in the mesh; degenerating said irregular blocks (31) merging contiguous edges or sides (33, 35) in one edge or side (37) so that triangular (2D) or pentahedral (3D) blocks (41) are formed and extending the modifications all along the blocks that are propagated; generating several rectangular (2D) or hexahedral (3D) regular blocks (43, 45, 47) inside said triangular (2D) or pentahedral (3D) blocks (41). The invention also refers to a system for carrying out said method.
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