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NEA-0377 THREAT.

THREAT, 3-D Steady-State or Transient Heat Diffusion in Multi-Region Prism

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1. NAME OR DESIGNATION OF PROGRAM:  THREAT.
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2. COMPUTERS
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Program name Package id Status Status date
THREAT NEA-0377/01 Tested 01-SEP-1977

Machines used:

Package ID Orig. computer Test computer
NEA-0377/01 IBM 370 series IBM 370 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The heat diffusion equation is solved over a region which is a prism with any desired shape of cross section and any distribution of material and sources. Very flexible boundary conditions are available.
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4. METHOD OF SOLUTION

The prism is divided into a number of plane slabs each of which is divided up in the same way into triangular prismatic finite elements. These elements may be any size thus allowing adequate representation of irregular shapes. Heat balance equations are set up for the resulting volume elements and these are solved by a conjugate gradient iteration. Temperatures are calculated at the nodes (corners of triangles).
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  About 1000 nodes in each plane.
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6. TYPICAL RUNNING TIME
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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM
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8. RELATED AND AUXILIARY PROGRAMS:  HEATRAN, the 2-D program on which THREAT is based.
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9. STATUS
Package ID Status date Status
NEA-0377/01 01-SEP-1977 Tested at NEADB
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10. REFERENCES

- THREAT, A 3-D Heat Transfer Program
  TRG Memo 6783(R).
- HEATRAN, A Finite Element Code for Heat Transfer Problems
  TRG Report 1807(R).
NEA-0377/01, included references:
- W.D. COLLIER, Group Computer Services Risley:
  THREAT : A 3-d Heat Transfer Program
  TRG Report 2684(R), June 1975
- THREAT Notes : Obtaining Pressure drops and Velocities from THREAT
- W.D. COLLIER :
  The use of Potential Theory in the Solution of Compressible Problems
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11. MACHINE REQUIREMENTS

(i) Core:  200k bytes
(ii) Data volumes: 11 files on disc or tape.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0377/01 FORTRAN-IV
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13. SOFTWARE REQUIREMENTS: OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHOR

W.D. Collier
Computer Section
Central Technical Services
Risley
United Kingdom.
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16. MATERIAL AVAILABLE
NEA-0377/01
File name File description Records
NEA0377_01.001 INFORMATION 8
NEA0377_01.002 THREAT SOURCE - F4 EBCDIC 6356
NEA0377_01.003 THREAT SOURCE - ASSEMBLER 445
NEA0377_01.004 SUBROUTINE MATRIZ - F4 EBCDIC 877
NEA0377_01.005 RISLEY SUBROUTINES - F4 EBCDIC 1780
NEA0377_01.006 RISLEY SUBROUTINES - ASSEMBLER 614
NEA0377_01.007 SUBROUTINES FOR DOUBLE PRECSION CALC 143
NEA0377_01.008 SUBROUTINES FOR LARGE PROBLEM 81
NEA0377_01.009 THREAT OVERLAY CARDS 49
NEA0377_01.010 THREAT DD CARDS 28
NEA0377_01.011 THREAT SAMPLE PROBLEM 1 INPUT DATA 30
NEA0377_01.012 THREAT SAMPLE PROBLEM 2 INPUT DATA 32
NEA0377_01.013 THREAT SAMPLE PROBLEM 3 INPUT DATA 21
NEA0377_01.014 THREAT SAMPLE PROBLEM 1 PRINTED OUTPUT 430
NEA0377_01.015 THREAT SAMPLE PROBLEM 2 PRINTED OUTPUT 310
NEA0377_01.016 THREAT SAMPLE PROBLEM 3 PRINTED OUTPUT 236
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: finite element method, heat transfer, iterative methods, steady-state conditions, three-dimensional, transients.