Accession Number : AD0715476

Title :   Multifrequency and Multidimensional Aspects of X-Ray Transport.

Descriptive Note : Final rept. Oct 69-Sep 70,

Corporate Author : SCIENCE APPLICATIONS INC LA JOLLA CALIF

Personal Author(s) : Latko,Robert J. ; Pomraning,Gerald C.

Report Date : NOV 1970

Pagination or Media Count : 133

Abstract : The report discusses multifrequency and multidimensional aspects of radiative transfer problems. A new grey, or multigroup, equation of transfer is derived which is consistent with the moment equation often used in numerical work (i.e., in the VERA and DRAD codes). This equation involves generalization, to strong temperature gradients, of the Planck and Rosseland mean opacities. The report also discuss a possible method for solving the two-dimensional moment equations which has the potential of saving large amounts of computer time. This method, called synthesis, involves representing the two-dimensional solution by a small number of coupled, one-dimensional solutions. A numerical example is given indicating the potential of the method. (Author)

Descriptors :   (*THERMAL RADIATION, TRANSPORT PROPERTIES), WAVE PROPAGATION, MATHEMATICAL MODELS, NEUTRON TRANSPORT THEORY, COMPUTER PROGRAMMING, X RAYS, STATISTICAL ANALYSIS

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE