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3. Semi-numerical methods SN
Numerous methods have been used, starting with complex mathematical developments, to achieve a numerical calculation compatible with the power of the first computers: method of moments, spherical harmonics, Fourier transform, eigenfunctions, etc.
Current semi-numerical methods (in one, two or three spatial dimensions) proceed as follows: the energy domain is partitioned into groups, and the multi-group transport equation is solved for neutrons, photons and coupled neutron-gamma problems. The angular flux per unit solid angle φ g,i,d in group g is discretized into a spatial (index i ) and angular (index d ) mesh.
In the S N codes used in France, the following numerical processes are implemented:
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Semi-numerical methods SN
Model-based methods
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