Computer Programs
NESC0525 ORTHIS-ORTHAT.
last modified: 01-APR-1979 | catalog | categories | new | search |

NESC0525 ORTHIS-ORTHAT.

ORTHIS, Steady-State Heat Conduction in 2-D X-Y, R-Z and R-Theta Geometry
ORTHAT, Transient Heat Conduction in 2-D X-Y, R-Z and R-Theta Geometry

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1. NAME OR DESIGNATION OF PROGRAM:  ORTHIS/ORTHAT
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2. COMPUTERS
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Program name Package id Status Status date
ORTHIS-ORTHAT NESC0525/01 Tested 01-APR-1979

Machines used:

Package ID Orig. computer Test computer
NESC0525/01 IBM 360 series IBM 360 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

ORTHIS and ORTHAT are designed  to solve steady-state and transient heat conduction problems, respectively, in two-dimensional geometries. Either Cartesian (x-y)  or cylindrical (r-z, r-theta) coordinate systems may be used. Thermal properties, heat generation rates, and boundary conditions may be functions of position, time, or temperature.
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4. METHOD OF SOLUTION

ORTHIS   uses   the   iterative   method   of
successive overrelaxation  to solve the steady-state  problem.  In
addition  to overrelaxation  it  also  uses a  dominant-error-mode
extrapolation  procedure  to  increase the  rate  of  convergence.
ORTHAT uses  a modified  alternating-direction implicit  method to
solve the transient problem.  The input for both programs has been
designed in an easily usable free-form style.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
    1000 vertical nodes
    1000 horizontal nodes
   10000 total nodes (rows*columns)
      50 vertical regions
      50 horizontal regions
    2500 total regions (rows*columns)
     300 materials
    1500 steady-state iterations
    5000 transient time-steps
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6. TYPICAL RUNNING TIME:  Both programs execute in 2 to 3 minutes.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC0525/01 01-APR-1979 Tested at NEADB
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10. REFERENCES:
NESC0525/01, included references:
- R.C. Durfee and C.W. Nestor, Jr.:
  ORTHIS, ORTHAT - Two Computer Programs for Solving Two-dimensional
  Steady-state and Transient Heat Conduction Problems
  ORNL-TM-3324 (July 1971).
- ACC Programming Note 73-3 (July 31, 1972).
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11. MACHINE REQUIREMENTS:  ORTHIS requires 700K, ORTHAT requires 1024K
bytes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0525/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Problems may be partially run and then restarted.  The printout is
made as  readable as possible and  includes a picture of  the mesh
assembly and temperature distributions and profiles.
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 R. C. Durfee and C. W. Nestor, Jr.
                 Oak Ridge National Laboratory
                 P. O. Box X
                 Oak Ridge, Tennessee  37830
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16. MATERIAL AVAILABLE
NESC0525/01
File name File description Records
NESC0525_01.001 INFORMATION 11
NESC0525_01.002 SUBROUTINE ERROR (F4,EBCDIC) 8
NESC0525_01.003 SUBROUTINE ERROR (ASSEMBLER,EBCDIC) 552
NESC0525_01.004 SUBROUTINES (ASSEMBLER,EBCDIC) 395
NESC0525_01.005 ORTHIS -- SOURCE PROGRAM (F4,EBCDIC) 6844
NESC0525_01.006 ORTHIS -- SAMPLE PROB. INPUT DATA 36
NESC0525_01.007 ORTHIS -- SAMPLE PROB. PRINTED OUTPUT 480
NESC0525_01.008 ORTHIS -- JCL 38
NESC0525_01.009 ORTHAT -- SOURCE PROGRAM (F4,EBCDIC) 7200
NESC0525_01.010 ORTHAT -- SAMPLE PROB. INPUT DATA 57
NESC0525_01.011 ORTHAT -- SAMPLE PROB. PRINTED OUTPUT 1089
NESC0525_01.012 ORTHAT -- JCL 41
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: fuel elements, heat transfer, r-theta, steady-state conditions, temperature dependence, thermal conductivity, time dependence, transients, two-dimensional, x-y.