CCC-0266 ONETRAN.
ONETRAN, 1-D Transport in Planar, Cylindrical, Spherical Geom. for Homogeneous, Inhomogeneous Probl., Anisotropic Source
NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| ONETRAN | CCC-0266/02 | Tested | 14-DEC-1982 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| CCC-0266/02 | IBM 3033 | IBM 3033 |
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3. DESCRIPTION OF PROBLEM OR FUNCTION
ONETRAN solves the one- dimensional multigroup transport equation in plane, cylindrical, spherical, and two-angle plane geometries. Both regular and adjoint, inhomogeneous and homogeneous (K-eff and eigenvalue searches) problems subject to vacuum, reflective, periodic, white, albedo or inhomogeneous boundary flux conditions are solved. General anisotropic scattering is allowed and anisotropic inhomogeneous sources are permitted.
ONETRAN solves the one- dimensional multigroup transport equation in plane, cylindrical, spherical, and two-angle plane geometries. Both regular and adjoint, inhomogeneous and homogeneous (K-eff and eigenvalue searches) problems subject to vacuum, reflective, periodic, white, albedo or inhomogeneous boundary flux conditions are solved. General anisotropic scattering is allowed and anisotropic inhomogeneous sources are permitted.
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4. METHOD OF SOLUTION
The discrete ordinates approximation for the angular variable is used with the diamond (central) difference approximation for the angular extrapolation in curved geometries. A linear discontinuous finite element representation for the angular flux in each spatial mesh cell is used. Negative fluxes are eliminated by a local set-to-zero and correct algorithm. Standard inner (within-group) iteration cycles are accelerated by system rebalance, coarsemesh rebalance, or Chebyshev acceleration. Outer iteration cycles are accelerated by coarse-mesh rebalance.
The discrete ordinates approximation for the angular variable is used with the diamond (central) difference approximation for the angular extrapolation in curved geometries. A linear discontinuous finite element representation for the angular flux in each spatial mesh cell is used. Negative fluxes are eliminated by a local set-to-zero and correct algorithm. Standard inner (within-group) iteration cycles are accelerated by system rebalance, coarsemesh rebalance, or Chebyshev acceleration. Outer iteration cycles are accelerated by coarse-mesh rebalance.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM
Variable dimensioning is used so that any combination of problem parameters leading to a container array less than MAXCOR can be accommodated. On CDC machines MAXCOR can be about 25 000 words and peripheral storage is used for most group-dependent data.
Variable dimensioning is used so that any combination of problem parameters leading to a container array less than MAXCOR can be accommodated. On CDC machines MAXCOR can be about 25 000 words and peripheral storage is used for most group-dependent data.
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6. TYPICAL RUNNING TIME
ONETRAN is approximately twice as slow as DTF-IV per inner iteration for the same space-angle mesh. However, ONETRAN has twice as many unknowns per spatial mesh cell and a coarser spatial mesh than DTF-IV will normally give equivalent accuracy. Furthermore, ONETRAN will usually converge to DTF-IV equivalent accuracy in fewer total iterations.
A 6-group, 106-interval mesh, S2 K-eff calculation with four outer iterations of an EBR-II core reqires 7.5 s on the CDC 7600. A 20- group, 134-interval mesh, S4 K-eff cell calculation with 12 outer iterations requires 5.5 min on the CDC 7600.
The 13 test cases included in the package have been executed by NEA- DB on IBM 3033 in 741 CPU seconds.
ONETRAN is approximately twice as slow as DTF-IV per inner iteration for the same space-angle mesh. However, ONETRAN has twice as many unknowns per spatial mesh cell and a coarser spatial mesh than DTF-IV will normally give equivalent accuracy. Furthermore, ONETRAN will usually converge to DTF-IV equivalent accuracy in fewer total iterations.
A 6-group, 106-interval mesh, S2 K-eff calculation with four outer iterations of an EBR-II core reqires 7.5 s on the CDC 7600. A 20- group, 134-interval mesh, S4 K-eff cell calculation with 12 outer iterations requires 5.5 min on the CDC 7600.
The 13 test cases included in the package have been executed by NEA- DB on IBM 3033 in 741 CPU seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM
Provision is made for creation of standard interface output files for Sn constants, inhomogeneous sources, angle-integrated fluxes, and angular fluxes. Standard interface input files for Sn constants, inhomogeneous sources, cross sections, and total or angular fluxes may be read. All binary operations are localized in subroutines REED and RITE. Flexible edit options, including restart capability are provided.
Provision is made for creation of standard interface output files for Sn constants, inhomogeneous sources, angle-integrated fluxes, and angular fluxes. Standard interface input files for Sn constants, inhomogeneous sources, cross sections, and total or angular fluxes may be read. All binary operations are localized in subroutines REED and RITE. Flexible edit options, including restart capability are provided.
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10. REFERENCES
- R. Douglas O'Dell and Raymond E. Alcouffe:
Transport Calculations for Nuclear Analyses: Theory and
Guidelines for Effective Use of Transport Codes
LA-10983-MS and UC-32 (September 1987)
- R. Douglas O'Dell and Raymond E. Alcouffe:
Transport Calculations for Nuclear Analyses: Theory and
Guidelines for Effective Use of Transport Codes
LA-10983-MS and UC-32 (September 1987)
CCC-0266/02, included references:
- T.R. Hill:ONETRAN, A Discrete Ordinates Finite Element Code for the Solution
of the One-Dimensional Multigroup Transport Equation
LA-5990-MS + Errata (June 1975).
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CCC-0266/02
| File name | File description | Records |
|---|---|---|
| CCC0266_02.003 | ONETRAN INFORMATION FILE | 45 |
| CCC0266_02.004 | ONETRAN SOURCE PROGRAM (FORTRAN-4) | 6179 |
| CCC0266_02.005 | ONETRAN INPUT DATA FOR 13 TEST CASES | 2917 |
| CCC0266_02.006 | ONETRAN OUTPUT OF 13 TEST CASES | 20446 |
| CCC0266_02.007 | ONETRAN JCL & INFORMATION | 83 |
Keywords: discrete ordinate method, finite element method, multigroup theory, neutron transport equation, neutron transport theory, one-dimensional, transport theory.