ESTS0486 FESH. (Abstract last modified 17-APR-2001)
1.
NAME OR DESIGNATION OF PROGRAM - FESH. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
ESTS0486/01 CDC 6600
3.
DESCRIPTION OF PROGRAM OR FUNCTION - FESH solves the spherical harmonics approximation to the second-order multigroup neutron transport equation in two dimensions. A three-dimensional spherical harmonics approximation of user-specified order is applied to the angular variable and two-dimensional spatial finite elements to the spatial variable. Scattering is assumed to be isotropic. Either multiplication eigenvalue problems or subcritical inhomogeneous source problems can be solved with several combinations of vacuum and reflective boundary conditions possible.
4.
METHOD OF SOLUTION - FESH solves the multigroup transport equations (outer iterations) using a power iteration technique on the fission source with coarse mesh rebalance acceleration. The within-group (inner iteration) equation is solved by a block successive overrelaxation method with coarse mesh rebalance acceleration available as an option. Each block represents coupling and source information for each spatial mesh point.
5.
RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - Sources and scattering are assumed to be isotropic; up-scattering is not allowed. Flexible dimensioning permits combinations of problem parameters to occupy an array of 50,000 words. Most group-dependent data is stored in extended core storage (ECS).
6.
TYPICAL RUNNING TIME - The time required for execution is problem-dependent. NESC executed the sample problem in 80 CP seconds on a CDC6600 and 20 CP seconds on a CDC7600.
7.
UNUSUAL FEATURES OF THE PROGRAM - The unique feature is a rigorous application of transverse buckling which incorporates transverse flux anisotropy into the buckled leakage.
8.
RELATED AND AUXILIARY PROGRAMS - 9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - 200,000 (octal) words of central memory and 142,000 (octal) words of ECS are needed to execute the program. Central memory requirements for single precision arithmetic may be estimated as (45M+10) * (L(L+1)/2)**2 + NSP*(l(l+1)/2)+2) words, where M is the number of material regions, L is the order of the spherical harmonics approximation, and NSP is the number of spatial mesh points.
12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - SCOPE. 14.
OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - Because of the central memory required to load the program, the dimension of the Q array must be decreased before FESH can be loaded onto a CDC7600. NESC reduced the dimension of the Q array to 20,000 to execute the sample problem on a CDC7600. The dimensions of the Q and XLARG arrays should be altered to fit the user's specific problem.
15.
NAME AND ESTABLISHMENT OF AUTHORS - 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: BUCKLING, MULTIGROUP THEORY, SPHERICAL HARMONICS, THREE-DIMENSIONAL, TWO-DIMENSIONAL
Program-name Package-ID Status
FESH ESTS0486/01 Arrived
ESTS0486/01: 17-APR-2001 Masterfiled Arrived
ESTS0486/01:
- R.N. Blomquist and E.E. Lewis:
Instruction Manual for the Computer FESH - Finite Element
Spherical Harmonics An x-y multigroup neutron transport computer
code utilizing spatial finite element and angular spherical
harmonic approximations to the even-parity form of the neutron
transport equation
(March 1978).
ESTS0486/01: FORTRAN-IV
E.E. Lewis
Northwestern University
Evanston, IL (United States)
ESTS0486/01:
FESH Source Program
FESH Sample Problem Input
user's guide Instruction Manual (March 1978) WRKPT
- C. Static Design Studies
Home - About Us - Work Areas - Data Bank - Publications - Press Room - List of acronyms - Search