LOCFES-B - A PROGRAM FOR SOLVING THE ONE-DIMENSIONAL PARTICLE-TRANSPORT EQUATION WITH USER SELECTED CLOF METHODS (NEW VERSION)

LOCFES provides automated estimation of the rate of convergence of the source iteration and the order of accuracy, i.e., the discretization error, of an arbitrary closed linear one-cell functional (CLOF) method used in solving the linear, steady-state, monoenergetic and azimuthal ly symmetric neutral-particle transport equation in one-dimensional pl ane-parallel geometry. LOCFES-B is not so much a new version of LOCFES as it is a new tool in the LOCFES suite. It is intended to solve the equation using any user-supplied CLOF method and to compare its soluti on (scalar or angular fluxes) at user-selected monitor points for any given problem to a set of user-supplied values obtained elsewhere (ben chmark values). LOCFES-B uses multiple mesh refinements, as did LOCFES . However, to improve its performance in accomplishing its new purpose : (1) the source functional values from each mesh are passed to its su ccessor and (2) an acceleration scheme for the source iteration has be en developed by the authors and added to LOCFES. Tests indicate that m ore than a ten-fold speedup over the LOCFES performance was achieved b y these enhancements on more slowly converging problems. LOCFES-B's ou tput is also modified from a 132-column format to screen-viewable 80-c olumn format. It is intended to be a tool for studying the performance of arbitrary spatial approximations, not a production code.