[PDF] Top 20 Homogenization in the energy variable for a neutron transport model

... from the nuclear engineering community for treating self-shielding ...To the best of the authors’ knowledge, the most widespread technique is a two-stage method originially ... Voir le document complet

... GENERALIZED ENERGY CONDENSATION METHOD 41 In the present chapter, we focus on the coarse-group cross sections generation problem in the deterministic ...branch. The ... Voir le document complet

... (23). The space-time random walk (35) together with the Markov model (32b) is very similar to the TDRW approach [70, 71] and can also be seen as a multi-state, or correlated CTRW ... Voir le document complet

... As the geometry is approximated with a triangular mesh, one can wonder if the results can be improved if we make calculations on the exact ...fit the exact geometry we study curved ... Voir le document complet

... investigated. The first one deals with the homogenization of single and multiphase flow in porous ...media. The convergence results are obtained by mean of the two-scale ... Voir le document complet

... applications, the need for better modeling of nuclear interactions has grown over the past ...radiation transport codes compute average quantities with great accuracy and performance, but ... Voir le document complet

... The homogenization of heterogeneous medium [ 14 – 18 ] introduces the concept of an equivalent homogeneous macroscopic medium, representing an effective behavior of the microscopic medium with ... Voir le document complet

... and for solving the synthetic problem during MOC iter- ations. The algorithms for the construction and solution of the MOC and DP N operators have been accelerated by using ... Voir le document complet

... studied in many papers : by using mixed finite elements schemes e.g. in [15, 19, 20, 22, 27, 29], ENO schemes in [23], finite difference methods [18, 34] and finite volume schemes in ...[13]. ... Voir le document complet

... [10–15]. In particular, it was shown that most of the proposed adjoint Monte Carlo methods can be regarded as particular cases of a broad class of probabilistic models where the simulation of ... Voir le document complet

... use the simplified prototype model of a nu- clear reactor introduced in Chapter I, which retains all the key ingredients of a real ...that the reactor can be represented ... Voir le document complet

... need for better accuracy in calculating neutronic parameters (such as reactivity, control rod worth, power distribution) leads to the development of transport core solvers taking advantage of ... Voir le document complet

... Conclusions The concept of the energy map is implemented in the Suspension Balance Model (SBM) in order to account for transport phenomena due to ... Voir le document complet

... The model can also describe the phase transitions that occur when attractive interaction predominate over repulsions (characterized with a zero derivative of the osmotic or the ... Voir le document complet

... by the equilibrium of forces, that are present and that control particles ...displacement. In the liquid–solid biphasic mixing case, there are numerous inter- ...actions. The simplification of ... Voir le document complet

... that the reduced system remains coherent with the exact ...Indeed the introduction of the effectivity factor k eff allows to tune the equations and further define subcritical, critical ... Voir le document complet

... iii. The simple conditional mean imputation method, imputing to missing data the predicted value resulting from a simple linear regression on the variable Age (for each covariate ... Voir le document complet

... 2.4 Model Data Processing As a multi-regional CGE model, the C-GEM is parameterized and calibrated based on a balanced social accounting matrix (SAM) for each ...region. A ... Voir le document complet

... During the past decades, the Ising distribution has attracted interest in many applied disciplines, as the maximum entropy distribution associated to any set of correlated binary (‘spin’) ... Voir le document complet

... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ... Voir le document complet