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NEA-0840 DENZ.

DENZ, Dense Toxic or Explosive Gases Dispersion in Atmosphere

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM 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:  DENZ.
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2. COMPUTERS
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Program name Package id Status Status date
DENZ NEA-0840/01 Tested 04-JUL-1986

Machines used:

Package ID Orig. computer Test computer
NEA-0840/01 ICL 2980 IBM 3081
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3. DESCRIPTION OF PROGRAM OR FUNCTION

DENZ is intented for the study  of the consequences of accidentally releasing large quantities of "heavy"-denser-than-air-chemically toxic or flammable gases to the atmosphere.
   The model divides atmospheric dispersion in four stages:
      - Formation of source cylinder
      - Slumping with very little entrainment of air
      - Entrainment of air
- Disappearance of all density driven effects. Growth of         "puff" determined only by ambient atmospheric turbulence.
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4. METHOD OF SOLUTION:
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

For flammable gases, the extension of DENZ to cover the consequences of igniting the cloud has not yet been developed.
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6. TYPICAL RUNNING TIME:
NEA-0840/01
NEA-DB executed the test cases included in this package on an IBM 3081 computer. The following CPU times were required: 30 seconds (case 1); 1 second (case 2).
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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
NEA-0840/01 04-JUL-1986 Tested at NEADB
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10. REFERENCES:
NEA-0840/01, included references:
- L.S. Fryer and G.D. Kaiser:
  DENZ - A Computer Program for the Calculation of the Dispersion
  of Dense Toxic or Explosive gases in the Atmosphere.
  SRD R152  (July 1979)
- Modification of the Computer Program DENZ to Include Graph
  Plotting Facilities.  SRD R236  (September 1982)
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11. MACHINE REQUIREMENTS:
NEA-0840/01
To run the test cases on IBM 3081, 336K bytes of main storage were required.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0840/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
NEA-0840/01
MVS-SP (IBM 3081).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

          L.S. Fryer, G.D. Kaiser
               U.K.A.E.A.
          Wigshaw Lane, Culcheth Warrington
          WA3 4NE,  U.K.
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16. MATERIAL AVAILABLE
NEA-0840/01
File name File description Records
NEA0840_01.001 Information file 55
NEA0840_01.002 DENZ source (fortran 77) 2340
NEA0840_01.003 JCL to run sample cases 57
NEA0840_01.004 Sample case 1 input 46
NEA0840_01.005 Sample case 1 output 1728
NEA0840_01.006 Sample case 2 input 20
NEA0840_01.007 Sample case 2 output 1211
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • R. Environmental and Earth Sciences

Keywords: accidents, dispersions.