CCC-0532: DORT-PC, 2-D Discrete Ordinates Transport System

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CCC-0532 DORT-PC. (Abstract last modified 04-AUG-1993)

DORT-PC, 2-D Discrete Ordinates Transport System

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OR DESIGNATION OF PROGRAM - Two-Dimensional Discrete Ordinates Transport Code System.

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.

Program-name Package-ID Status DORT-PC CCC-0532/01 Tested

Machines used: Package-ID Orig.Computer Test Computer CCC-0532/01 IBM PC PC-80486

3. DESCRIPTION OF PROGRAM OR FUNCTION - This version of DORT (ORNL Mod 5, 12 Oct 89, INEL Ver 2.1) was derived from the Cray UNICOS version distributed in CCC-543/TORT, which was developed at ORNL under Defense Nuclear Agency sponsorship. DORT is directly based on the earlier DOT codes. DORT-PC determines the fluence of particles throughout one- or two-dimensional geometric systems due to sources either generated as a result of particle interaction with the medium or incident upon the system from extraneous sources. The principal application is to the deep-penetration transport of neutrons and photons. Criticality (k-type and search) problems can also be solved. Numerous printed edits of the results are available, and results can be transferred to output files for subsequent analysis.

4. METHOD OF SOLUTION - The Boltzmann transport equation is solved, using either the method of discrete ordinates or diffusion theory approximation. In the discrete ordinates method, the primary mode of operation, balance equations are solved for the flow of particles moving in a set of discrete directions in each cell of a space mesh and in each group of a multigroup energy structure. Iterations are performed until all implicitness in the coupling of cells, directions, groups, and source regeneration has been resolved. Several methods are available to accelerate convergence. Anisotropic cross sections can be expressed in a Legendre expansion of arbitrary order. Output data sets can be used to provide an accurate restart of a previous problem or to deliver information to other codes. Several techniques are available to remove the effects of negative fluxes caused by the finite difference approximation and of negative scattering sources due to truncation of the cross-section expansion. The space mesh can be described such that the number of first-dimensional (i) intervals varies with the second dimension (j). The number of discrete directions can vary across the space mesh and with energy. Direction sets can be biased, with discrete directions concentrated such as to give fine detail to streaming phenomena.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - External force fields or nonlinear effects cannot be treated. Flexible dimensioning is used throughout so that no restrictions are imposed on individual problem parameters. Certain options, especially diffusion theory, are not compatible with variable mesh and quadrature problems.

6. TYPICAL RUNNING TIME - Running time varies from a few minutes to many hours depending on the complexity of the problem and whether or not extended memory is available. The extended memory version typically runs about three times faster than the 640K version for a given application.

7. UNUSUAL FEATURES OF THE PROGRAM -

8. RELATED AND AUXILIARY PROGRAMS - GIP: Prepares required macroscopic cross sections for DORT-PC.

9. STATUS
CCC-0532/01: 04-AUG-1993 Screened

10. REFERENCES  -
CCC-0532/01:
- Dave Nigg:
  READ.ME
  Informal Notes (August 1991).
- W.A. Rhoades and R.L. Childs:
  An Updated Version of the DOT 4 One-and Two-Dimensional
  Neutron/Photon Transport Code
  ORNL-5851 (April 1982).
- W.A. Rhoades and M.B. Emmett:
  DOS - The Discrete Ordinates System
  ORNL/TM-8362, pp. 33-46 (September 1982).

11. MACHINE REQUIREMENTS - DORT-PC runs on IBM PC or PS/2 computers with at least 640K RAM, a math co-processor and 40 Mb of fixed disk. With minor changes, the same source has been compiled and run on IBM RISC workstations.

12. PROGRAMMING LANGUAGE(S) USED -
CCC-0532/01: FORTRAN

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - The extended memory version was manufactured using the Lahey F77L-EM32 Fortran compiler Version 4.01, the Eclipse Linker Version 2.1.05 and the Eclipse Binder Version 1.3.0. (Linker and Binder are also distributed by Lahey.) The 640K version was manufactured using the Lahey F77L Fortran compiler Version 2.22 and the Phoenix PLINK86 Overlay Linker Version 1.48 (DORT-PC) and the Microsoft DOS Linker Version 2.30 (GIP).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -

15. NAME AND ESTABLISHMENT OF AUTHORS - Idaho National Engineering
Laboratory, Idaho Falls, Idaho.

16. MATERIAL AVAILABLE -
CCC-0532/01:
CCC0532_01.001    Information file                                   34 records
CCC0532_01.002    PC installation instructions                       23 records
CCC0532_01.003    Author's information                              144 records
CCC0532_01.004    Source,data,output (compressed)                     0 records
CCC0532_01.005    Executables        (compressed)                     0 records
CCC0532_01.006    DOS file-names                                      5 records

17. CATEGORIES -

- J. Gamma Heating and Shield Design

Keywords: CRITICALITY SEARCHES, DISCRETE ORDINATE METHOD, NEUTRON TRANSPORT THEORY, PHOTON TRANSPORT, TWO-DIMENSIONAL

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