Computer Programs

NESC0525 ORTHIS-ORTHAT.

NESC0525 ORTHIS-ORTHAT.

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

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 AUTHORS, MATERIAL, CATEGORIES

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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.