O Metodo das ordenadas discretas na solucao da equacao de transporte em geometria plana com dependencia azimutal

The method of discrete ordinates is applied to the solution of the slab albedo problem with azimuthal dependence in transport theory. A new set of quadra­ tures appropriate to the problem is introduced. In addition to the ANISN code, mod­ ified to include the proposed formahsm, two new programs, PEESNC and PEESNA, which were created on the basis of the discrete ordinates formalism, using the direct integration method and the analytic solution method respectively, are used in the generation of results for a few sample problems. Program PEESNC was created to val­ idate the results obtained with the discrete ordinates method and the finite difference approximation (ANISN), while program PEESNA was developed in order to imple­ ment an analytical discrete ordinates formalism, which provides more accurate results. The obtained results for selected sample problems are compared with highly accurate numerical results published in the literature. Compared to ANISN and PEESNC, pro­ gram PEESNA presents a greater efficiency in execution time and much more precise numerical results.