A method for simulating flows in reservoirs, such as hydrocarbons, by
means of chimera type grid which fluid generates a chimera grid made up
of a set of elementary grids for accounting for characteristics of the
flows and of the geometry (e.g., radial grid in the well zone and CPG
grid for the reservoir) so that their union covers the entire simulation
domain and that there is a minimum overlap between two neighboring
elementary grids. Interpolation parameters allowing connection of the
flows calculated on the grid to the flows calculated on the neighboring
grids are then determined on the border of each elementary grid. Finally,
flows are simulated within the reservoir and the well, and the variables
describing the flow on the border of the overlap zones are interpolated
using the interpolation parameters.