# American Institute of Mathematical Sciences

October  2016, 9(5): 1351-1375. doi: 10.3934/dcdss.2016054

## The IDSA and the homogeneous sphere: Issues and possible improvements

 1 Université de Genève, Section de Mathématiques, 2-4, rue du Lièvre, CP 64, CH-1211 Genève, Switzerland

Received  December 2014 Revised  July 2015 Published  October 2016

In this paper, we are concerned with the study of the Isotropic Diffusion Source Approximation (IDSA) [6] of radiative transfer. After having recalled well-known limits of the radiative transfer equation, we present the IDSA and adapt it to the case of the homogeneous sphere. We then show that for this example the IDSA suffers from severe numerical difficulties. We argue that these difficulties originate in the min-max switch coupling mechanism used in the IDSA. To overcome this problem we reformulate the IDSA to avoid the problematic coupling. This allows us to access the modeling error of the IDSA for the homogeneous sphere test case. The IDSA is shown to overestimate the streaming component, hence we propose a new version of the IDSA, which is numerically shown to be more accurate than the old one. Analytical results and numerical tests are provided to support the accuracy of the new proposed approximation.
Citation: Jérôme Michaud. The IDSA and the homogeneous sphere: Issues and possible improvements. Discrete & Continuous Dynamical Systems - S, 2016, 9 (5) : 1351-1375. doi: 10.3934/dcdss.2016054
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