FIREBALL PHENOMENOLOGY AND CODE DEVELOPMENT; VOL 3, SPUTTER SUBROUTINES FOR RADIATION TRANSPORT IN SPHERES

Abstract

The radiation transport subroutines of the SPUTTER code for spherical geometry have been revised. The DIFFU subroutine has been eliminated and RADTN, TRANS, and KAPPA have been recoded. The results of this work on the codes are (1) improved logical organization, (2) more efficient and rapid calculation, (3) improved accuracy, (4) more complete documentation, and (5) comparisons with test problems. The much simpler and more accurate diffusion approximation is exploited when a new diffusion criterion is satisfied in shells within the sphere. A more accurate angular integration of the intensity makes use of the v- line integration results more efficiently to give improved fluxes. Reorganization of the calculation, saving of quantities to be used again, and use of a fast exponential routine have resulted in speeding up the routines by approximately a factor of 2. The diffusion and angular integration improvements apparently have resulted in an additional factor of 2 speedup for the same accuracy.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1966
Accession Number
AD0485368

Entities

Organizations

  • General Dynamics

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Accuracy
  • Air Force
  • Boltzmann Equation
  • Boundaries
  • Contracts
  • Equations
  • Frequency
  • Geometry
  • Government (Foreign)
  • Governments
  • Integrals
  • Numerical Quadrature
  • Radiation
  • Radiation Pressure
  • Radiative Transfer
  • Temperature Gradients

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Parallel and Distributed Computing.
  • Systems Analysis and Design