Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10356215 | Journal of Computational Physics | 2012 | 11 Pages |
Abstract
Discrete Diffusion Monte Carlo (DDMC) is a technique for increasing the efficiency of Implicit Monte Carlo radiative-transfer simulations in optically thick media. In DDMC, particles take discrete steps between spatial cells according to a discretized diffusion equation. Each discrete step replaces many smaller Monte Carlo steps, thus improving the efficiency of the simulation. In this paper, we present an extension of DDMC for frequency-dependent radiative transfer. We base our new DDMC method on a frequency-integrated diffusion equation for frequencies below a specified threshold, as optical thickness is typically a decreasing function of frequency. Above this threshold we employ standard Monte Carlo, which results in a hybrid transport-diffusion scheme. With a set of frequency-dependent test problems, we confirm the accuracy and increased efficiency of our new DDMC method.
Related Topics
Physical Sciences and Engineering
Computer Science
Computer Science Applications
Authors
Jeffery D. Densmore, Kelly G. Thompson, Todd J. Urbatsch,