NEA-0377 THREAT.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, CPU, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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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.