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Manuscript Title: LOCFES-B: a program for solving the one-dimensional particle transport equation with user selected CLOF methods (new version).
Authors: R.D. Jarvis, P. Nelson
Program title: LOCFES-B
Catalogue identifier: ACVD_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 82(1994)265
Programming language: Fortran.
Computer: VAX 9000-210V.
Operating system: VMS VERSION 5.4-3.
RAM: 2500K words
Word size: 32
Keywords: Reactor systems, Particle transport, Neutron transport, Radiative transfer, Discrete ordinates, Source iteration, (closed) linear one cell functional methods, Acceleration.
Classification: 21.2, 22.

Other versions:
Cat Id Title Reference
ACJP_v1_0 LOCFES CPC 74(1993)91

Nature of problem:
Steady state, monoenergetic, azimuthally symmetric neutron-particle transport in one-dimensional plane-parallel geometry.

Solution method:
Source iteration applied to the discrete-ordinates approximation for the angular variable [2], with a quadrature rule specified by input, and an arbitrary closed linear one-cell functional approximation for the spatial variable [3-5], as defined by a user-supplied modular subroutine.

The current version is limited to 8 angular (polar direction cosine) quadrature points that must be symmetric about the origin. It also is limited to 4 zones, a maximum of 4096 spatial cells per zone, and closed linear one-cell spatial approximations having at most four basic linear functionals (BLF's). These limitations represent array dimensions and may be changed by resetting appropriate parameters.

Unusual features:
LOCFES-B finds angular or scalar fluxes of neutral particles at specified spatial points using any user-supplied CLOF method in multi- region, subcritical media and one spatial dimension. LOCFES-B will compare its final flux results to those from another source, if desired.

Running time:
Highly subcritical problems (dominant eigenvalue much less than 1.0) require only seconds of central processing unit (cpu) time even on desktop and laptop computers, while problems that are highly multiplying (dominant eigenvalue nearly 1.0) converge very slowly and can take on the order of a few hours of VAX 9000 cpu time.

[1] Paul Nelson and David S. Ek, Comp. Phys. Comm. 74(1993)91-118.
[2] E.E. Lewis and W.F. Miller Jr., Computational Methods of Neutron Transport (Wiley, 1984).
[3] P. Nelson and R. Zelazny, Nucl. Sci. Eng. 93(1986)283.
[4] P. Nelson, Ann. Nucl. Energy 14(1987)177.
[5] H.B. Keller and P. Nelson, Trans. Theory Stat. Phys. 17(1988)191.