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.
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