Abstract: A computer-aided method suitable for assisting in the design of an object zone, such as a CROR engine of an aircraft subjected to high vorticity and/or low static pressure fields when moving inside a flow field, by providing suitable seed points for constructing vortex core lines in a fluid data model of the environment of the object zone and a system based on the method. The method steps are: a) Obtaining a dataset containing all the cells or points satisfying one of the conditions of four Region-based vortex detection criteria (the Q-criterion, the Kinematic vorticity number, the ?-criterion, the ?2-criterion); b) Obtaining a new dataset containing all the cells or points of the previous dataset satisfying one of the conditions mentioned in step a) not selected previously; c) Repeating the step b) until all the conditions mentioned in step a) have been selected in step b).

Abstract: A method of generating a mesh of an object (11) that moves through a fluid medium which is used in the design or analysis of said object (11) in connection with a hybrid method combining RANS and LES comprising the following steps: a) creating an inner “C” topology (21) around said object (11) for a boundary layer description; b) creating an outer “C” topology (23) covering a space region including the separation region; c) locating the separation region and adapting to it said inner and outer “C's” topologies (21, 23) so that the outer “C” topology (23) is adapted to the size of the separated region and the inner “C” topology (21) is adapted to the size of the boundary layer; d) refining the mesh in the separation region according to the specifications of said RANS/LES method. The invention also refers to a system for carrying out said method.