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NEA-1635 NIRAD.

NIRAD, A Two-Dimensional Radiation Hydrodynamics Code

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1. NAME OR DESIGNATION OF PROGRAM:  NIRAD.
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2. COMPUTERS
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Program name Package id Status Status date
NIRAD NEA-1635/01 Tested 16-NOV-2001

Machines used:

Package ID Orig. computer Test computer
NEA-1635/01 IBM RISC6000 WS PC Pentium III,Linux-based PC
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3. PROBLEM SOLVED

Calculation of compressible and high energetic hydrodynamic fields including photon transport and heat conduction in two-dimensional curvilinear geometry.
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4. METHODS

The analytical hydrodynamic equations are solved by a combined Lagrangean and Eulerian approximation applying Godunov method and finite volume technique.  The space angle dependent photon equation is treated similar to the neutron transport equation using a set of predefined space angles and a multigroup structure of opacity data.  The timestep size is adapted by CFL control.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The underlying equation of state data library for the high temperature and pressure regime is restricted to aluminum only.  The numerical accuracy is restricted by allocatable fast and disk storage.
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6. TYPICAL RUNNING TIME

388 cpu-seconds for a problem with a 20 by 20 mesh, 10 opacity groups and 1000 time steps on an IBM Rise 6000 and 174 seconds for the same problem on an 700 MHZ- PC with Linux.
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7. UNUSUAL FEATURES

a) Free streaming, fixed or symmetrical boundary conditions may be imposed on the fluid equations.
b) Incoming radiative flux, relecting or mirror symmetrical boundary conditions for the radiation field can be treated.
c) Complex subregions with different physical properties can be constructed by superposition of single quadrangles.
d) Density and temperature dependent opacity tables with many frequency groups can be used and interpolated with an effective table look-up algorithm.
e) The multi-group and multi-angle radiation equations are solved by a checker board band solver with cache optimisation.
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8. RELATED OR AUXILIARY PROGRAMS

Results can easily be evaluated graphically with the TECPLOT software as this tool is able to represent arbitrary moving grids.
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9. STATUS
Package ID Status date Status
NEA-1635/01 16-NOV-2001 Tested at NEADB
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10. REFERENCES
NEA-1635/01, included references:
- W.Hoebel, B.Goel, A.L. Ni, H.Marten:
Energy Transport in Matter with Rapidely Changing States,
NSE, 2000
- W.Hoebel, A.L. Ni:
Godunov-Like Scheme for two-Dimensional Computation,
Proc. Seminar on 3D Deterministic Transport Computer Programs,
Features, Applications and Perspectives
2-3 December 1996, Paris, ISBN 92-64-16020-5, pg 261-272
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11. HARDWARE REQUIREMENTS

The code can be installed and reasonably used on a PC with more than 64 Megabyte fast memory and higher CPU-speed. (>Pentium II).  Temporary files are used for program tests only.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1635/01 FORTRAN-90
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13. SOFTWARE REQUIREMENTS
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS
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15. NAME AND ESTABLISHMENT OF AUTHORS

- W. Hoebel, A.Ni, B.Goel
Forschungzentrum Karlsruhe
D-76021 Karlsruhe
Germany
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16. MATERIAL AVAILABLE
NEA-1635/01
NIRAD source and makefiles
EOS (equation of state) data for AL
AL Opacity tables
Sample problem input
Sample problem output
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17. CATEGORIES
  • F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: hydrodynamics, radiation, transport, two-dimensional.