A dynamic multi-scale model for transient radiative transfer calculations

Time-dependent radiative transfer calculations for supernovae

In previous papers we discussed results from fully time-dependent radiative transfer models for core-collapse supernova (SN) ejecta, including the Type II-peculiar SN 1987A, the more ‘generic’ SN II-Plateau, and more recently Type IIb/Ib/Ic SNe. Here we describe the modifications to our radiative modelling code, CMFGEN, which allowed those studies to be undertaken. The changes allow for time-de...

E$cient eigenvalue calculations in radiative transfer

An e$cient method is used to compute the eigenvalues required in a discrete-ordinates solution to a special class of radiative-transfer problems. The basis for this computation is an algorithm for "nding eigenvalues of a matrix that consists of the sum of a diagonal matrix and a rank-one matrix, a form that can arise in a discrete-ordinates solution of some basic transport problems. To illustra...

A Multi-Scale Dynamic Mechanistic Model for Transient Analysis of PEFCs

In this paper we propose a new knowledge model to understand the dynamic behavior of a Membrane-Electrodes Assembly (MEA) of a Polymer Electrolyte Fuel Cell. The model, multiscale and mechanistic, is based on irreversible thermodynamics and electrodynamics, and depends on the internal physical parameters such as the specific catalytic area, the electric permittivity of the materials, the reacti...

On Discrete Spectrum Calculations in Radiative Transfer

The discrete spectrum for each component problem in a Fourier decomposition of the equation of transfer is analyzed for the case of an Lth-order scattering law. The problem of determining the number of zeros of the dispersion function for each Fourier-component problem and the problem of computing all of these zeros are formulated and resolved in terms of Sturm sequences. Computational aspects ...

Radiative accelerations for evolutionary model calculations