Data Bank > Computer program services
last modified: 06-AUG-1987 | catalog | categories | new | search |

NEA-0471 TVEDIM.

TVEDIM, 2-D Homogeneous and Inhomogeneous Neutron Diffusion for X-Y, R-Z, R-Theta Geometry

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
[ top ]
1. NAME OR DESIGNATION OF PROGRAM:  TVEDIM.
[ top ]
2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
TVEDIM NEA-0471/01 Tested 06-AUG-1987

Machines used:

Package ID Orig. computer Test computer
NEA-0471/01 BURROUGHS 6700 Many Computers
[ top ]
3. NATURE OF PHYSICAL PROBLEM SOLVED

The two-dimensional neutron diffusion equation (x-y, r-z, or r-theta geometry is solved, either  in the inhomogeneous (source calculation) or the homogeneous form (Keff calculation or absorber adjustment). The boundary conditions specify each group current as a linear homogeneous function of the group fluxes (gamma matrix concept). For each material, the fission  matrix is assumed to by dyadic.
[ top ]
4. METHOD OF SOLUTION

Finite difference formulation (5 point scheme, mesh corner variant) is used.  Solution technique:  multiline SOR.
Eigenvalue estimate by neutron balance.
[ top ]
5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
[ top ]
6. TYPICAL RUNNING TIME

Examples:
(1) 2 groups, 10 x 10 meshes, relative flux accuracy (iteration  error) 5 x 10**(-8), 14 fine mesh iterations: CPU time = 16 sec.
(2) 2 groups, 80 x 80 meshes, relative flux accuracy (iteration error) 5 x 10**(-7), 31 fine mesh iterations: CPU time = 1050 sec.
[ top ]
7. UNUSUAL FEATURES OF THE PROGRAM

Multi-line relaxation with user specified block size, mesh subdivision capability, gamma matrices, one inner iteration per outer iteration.
[ top ]
8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS
[ top ]
9. STATUS
Package ID Status date Status
NEA-0471/01 06-AUG-1987 Screened
[ top ]
10. REFERENCES

- G.K. Kristiansen:
  'The Two-Dimensional Finite-Difference Neutron Diffusion Program TVEDIM'
  RISO-M-1919 (1977).
[ top ]
11. MACHINE REQUIREMENTS

The program uses disc storage and double precision arithmetic. The choice of block size may be limited by the available buffer area (fast memory).
[ top ]
12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0471/01 ALGOL
[ top ]
13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED
[ top ]
14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
[ top ]
15. NAME AND ESTABLISHMENT OF AUTHOR

   G.K. Kristiansen
   Dept. of Reactor Technology
   Research Establishment
   RISO, Denmark.
[ top ]
16. MATERIAL AVAILABLE
NEA-0471/01
File name File description Records
NEA0471_01.001 Information file 34
NEA0471_01.002 TVEDIM source program 1533
NEA0471_01.003 TVEDIM input sample problem 44
[ top ]
17. CATEGORIES
  • C. Static Design Studies

Keywords: finite difference method, neutron diffusion equation, r-theta, r-z, two-dimensional, x-y.