Patent ID: 6996511

Claim:
A method for generating a three-dimensional mesh representing a rotating machine with a stator or a rotor having a twisted structure in a direction of a rotation axis of the rotor, including a spatial area between the stator and the rotor, by a combination of a plurality of polyhedrons, comprising steps of: generating a two-dimensional mesh in which a ring-shaped gap is provided around the rotation axis in the spatial area, portions facing each other with the ring-shaped gap therebetween are equally divided into mutually equal number of parts, and a stator-side portion and a rotor-side portion, excluding the ring-shaped gap, are represented by a combination of a plurality of polyhedrons on a plane perpendicular to the rotation axis; generating an initial three-dimensional mesh by joining together a plurality of the two-dimensional meshes with the stator-side portion and the rotor-side portion relatively rotated on the rotation axis according to the twisted structure, in the direction of the rotation axis according to a rule which is the same for both the stator-side portion and the rotor-side portion; forming a boundary surface constructed by a mesh surface obtained by concentrically projecting, into a cylindrical gap composed of a stack of the ring-shaped gaps, any one of a stator-side mesh surface and a rotor-side mesh surface which face each other with the cylindrical gap therebetween; and filling spaces between the boundary surface and the stator-side mesh surface and rotor-side mesh surface with a plurality of polyhedrons, including polyhedrons comprising each of surface elements including the boundary surface, the stator-side mesh surface and the rotor-side mesh surface as one face, to generate the three-dimensional mesh.