FIREBALL PHENOMENOLOGY AND CODE DEVELOPMENT; VOL 3, SPUTTER SUBROUTINES FOR RADIATION TRANSPORT IN SPHERES
Rept. for 1 Jun-13 Jul 1965
GENERAL DYNAMICS SAN DIEGO CA GENERAL ATOMIC DIV
Pagination or Media Count:
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.
- Computer Programming and Software