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NESC9911 CNVUFAC, GRAY.

GRAY CNVUFAC, Black-Body Radiation View Factors with Self-Shadowing

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1. NAME OR DESIGNATION OF PROGRAM:  CNVUFAC, GRAY.
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2. COMPUTERS
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Program name Package id Status Status date
CNVUFAC NESC9911/01 Tested 02-MAY-1991
GRAY NESC9911/02 Tested 02-MAY-1991

Machines used:

Package ID Orig. computer Test computer
NESC9911/01 CRAY 1 CRAY X-MP
NESC9911/02 CRAY 1 CRAY X-MP
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3. DESCRIPTION OF PROGRAM OR FUNCTION

CNVUFAC, the General Dynamics heat-transfer radiation view program, was adapted for use on the LLNL computer system. The input and output were modified, and a node incrementing logic added for compatibility with TRUMP (NESC 771) thermal analyzer and related codes. The program performs the multiple integration necessary to evaluate the geometric black-body  radiation node to node view factors. CNVUFAC uses an elemental area  summation scheme to evaluate the multiple integrals. The program permits shadowing and self-shadowing. The basic configuration shapes that can be considered are cylinders, cones, spheres, ellipsoids, flat plates, disks, toroids, and polynomials of revolution. Portions of these shapes can also be considered. Card-image output containing node number and view factor information is generated for input to GRAY, a related code.
GRAY performs the matrix manipulations necessary to convert black-body radiation heat-transfer view factors to gray-body view factors as required by thermal analyzer codes. The black-body view factors contain only geometric relationships. GRAY allows the effects of multiple gray-body reflections to be included. The resulting effective gray-body view factors can then be used with the corresponding fourth-power temperature differences to obtain the net radiative heat flux. GRAY accepts a matrix input or the card-image output generated by CNVUFAC. The resulting card-image GRAY output is in a form usable by TRUMP.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME:
NESC9911/01
The test case included in this package was executed at  NEADB on a CRAY-XMP computer in 23 seconds of CPU time.

NESC9911/02
The test case included in this package was executed at  NEADB on a CRAY-XMP computer in 4.5 seconds of CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

TRUMP a steady state and transient, 1, 2 and 3-D potential flow and temperature distribution code.
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9. STATUS
Package ID Status date Status
NESC9911/01 02-MAY-1991 Tested at NEADB
NESC9911/02 02-MAY-1991 Tested at NEADB
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10. REFERENCES:
NESC9911/01, included references:
- Robert L. Wong:
  User's Manual for CNVUFAC, the General Dynamics Heat-Transfer
  Radiation View Factor Program
  UCID-17275 (June 25, 1976).
NESC9911/02, included references:
- R.L. Wong
  GRAY: A Program to Calculate Gray-Body Radiation Heat-Transfer
  View Factors from Black-body View Factors
  UCID-17277 (June 14, 1976).
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11. MACHINE REQUIREMENTS:
NESC9911/01
Test case execution required 1,003,000 (dec) words of CRAY-XMP main storage.

NESC9911/02
Test case execution required 842,752 (dec) words of CRAY-XMP main storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9911/01 FORTRAN-IV
NESC9911/02 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
NESC9911/01
The program ran on CRAY-XMP under UNICOS 5.1.10 with the CFT77 4.1 FORTRAN 77 compiler.

NESC9911/02
The program ran on CRAY-XMP under UNICOS 5.1.10 with the CFT77 4.1 FORTRAN 77 compiler.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

          R.L. Wong
          Lawrence Livermore National Laboratory
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16. MATERIAL AVAILABLE
NESC9911/01
File name File description Records
NESC9911_01.001 Information file 41
NESC9911_01.002 JCL and control information 20
NESC9911_01.003 CNVUFAC source program 949
NESC9911_01.004 CNVUFAC sample problems input 32
NESC9911_01.005 CNVUFAC sample problems output 256
NESC9911/02
File name File description Records
NESC9911_02.001 Information file 41
NESC9911_02.002 JCL and control information 20
NESC9911_02.003 GRAY source program 432
NESC9911_02.004 GRAY sample problems input 56
NESC9911_02.005 GRAY sample problems outut 498
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: configuration, heat transfer, thermal analysis.