, The criticality problem for the annealed algorithms So far, we have described the CLS, PBS and LRP algorithms for a fixed source transport in nonmultiplying media, i.e., without fission. For annealed disorder algorithms, a particle can undergo the following events: crossing of an interface, reflection/leakage (depending on the boundary conditions) , for annealed algorithms

, ? for the PBS-1 algorithm: the material label i and additionally the coordinates (x c , y x , l c ) of center of the current random box and its dimensions l x , l

, ? for the PBS-2 algorithm: the material label i and additionally the coordinates (x c , y x , l c ) of center of the current random box

, On peut se demander, d` es lors, comment améliorer l'algorithme CLS pour augmenter sa précision. En dimension 1, deux versions améliorées du CLS (algorithmes dits 'B' et 'C') ontétésontétés proposées dans la littérature, afin d'inclure des effets supplémentaires de corrélation et de mémoire locale. Nous avons voulu développer de tels algorithmes en dimension d. Nous avons proposé une nouvelle classe de méthodes de type 'désordre homogénéisé', les algorithmes Poisson-Box Sampling (PBS). Il s'agit d'ajouter des effets de corrélation et de mémoire pour mieux reproduire le désordre dans des géométries de Poisson, ? for the LRP algorithm: the material label i and additionally the forward distance + i to the next interface and the backward distance ? i to the next interface; for the new particle, these computed k eff with the following methods: i) by solving the Levermore-Pomraning equa, we have applied the CLS, p.1

, produit pour lapremì ere fois des solutions de référence 3d pour des probì emes de transportàtransportà source fixe et pour desprobì emes de criticité dans des géométries aléatoires, Conclusions Nous avons implémenté un générateur de géométries aléatoires pour des géométries Markoviennes (notamment en dimension 3)

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