Abstract: The invention provides an aircraft with a ventral fairing able to store equipment and systems in lateral zones. The ventral fairing (20) comprises a first zone of length L1 along the X-axis, where the area of the cross-section perpendicular to the X-axis increases in the direction of the air flow and a second zone of length L2, where the area of the cross-section perpendicular to the X-axis decreases in the direction of the air flow, being L1>L2 and being placed the rear end of said first zone behind the intersection of the trailing edge of the wing (15) with the fuselage (13).

Abstract: The invention provides an aircraft with a ventral fairing able to store equipment and systems in lateral zones. The ventral fairing (20) comprises a first zone of length L1 along the X-axis, where the area of the cross-section perpendicular to the X-axis increases in the direction of the air flow and a second zone of length L2, where the area of the cross-section perpendicular to the X-axis decreases in the direction of the air flow, being L1>L2 and being placed the rear end of said first zone behind the intersection of the trailing edge of the wing (15) with the fuselage (13).

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

Abstract: 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.