1. NAME AND TITLE
FANG: An Angular Folding Code System for Channel Theory Analysis.
DEFILE: Service Routines.
DOT3.5: Two-Dimensional Discrete Ordinates Radiation Transport Code System.
Oak Ridge National Laboratory, Oak Ridge, Tennessee (A).
Century Research Center Corp., Tokyo, Japan (B).
3. CODING LANGUAGE AND COMPUTER
Fortran IV, Assembler Language; IBM 360/370, CDC.
4. NATURE OF PROBLEM SOLVED
FANG calculates the "contribution flux" and "contribution leakage" necessary for performing
"channel theory" analysis and also provides 3-D plots of streaming channels, performs space-energy
dependent folding, and computes 2-D angular fluxes. It also calculates the contribution leakage across
5. METHOD OF SOLUTION
FANG uses information available on a DOT scalar flux tape for performing its analyses. It calculates "channel theory" analysis functions by using various folding options for direction, interval, and group. It calculates angular forward and adjoint fluxes by group, interval, and angle from expansion of Legendre moments on DOT scalar flux tape.
FANG is flexibly dimensioned and reads input in fixed or free form FIDO format. Forward and
adjoint fluxes are assumed available from previous DOT calculations.
6. RESTRICTIONS OR LIMITATIONS
The user should be aware that reconstructed forward and adjoint angular fluxes are used in the
calculation of the contribution flux; if unreasonable answers appear (e.g., negative values), the number
of moments input to FANG should be checked.
7. TYPICAL RUNNING TIME
On an IBM 360/91 computer, relatively complex problems take from 1 to 3 minutes.
8. COMPUTER HARDWARE REQUIREMENTS
FANG is operable on the IBM 360/370 or the CDC computers. A large problem requires
approximately 540 K bytes.
9. COMPUTER SOFTWARE REQUIREMENTS
Fortran IV and Assembler Language compilers are required.
M. L. Williams and F. B. Sadler, "The Fang Angular Folding Code for Channel Theory Analysis,"
ORNL/TM-5228 (August 1977).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
code and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORD: FREE FIELD FORMAT