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Looking at the details of SimpleX

Bethlehem, J. van (2007) Looking at the details of SimpleX. Master's Thesis / Essay, Astronomy.

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SimpleX is a new numerical tool to study transport processes in general and radiation transport during the reionization epoch in particular. It is the first method to utilize an unstructured grid. The method hinges on the possibility to set up the grid in such a way that the lenghts of the edges in the grid sample the mean free path of the medium. This direct relation between the physics and the grid is theoretically sound, but not yet verified in practice. In this report many details are studied that arise when using unstructured grids. We find some unexpected properties of the grid and confirm the correctness of other properties. The most unexpected result is that photons can travel on average per timestep over large distances than the mean edge length. The speed even depends on the number of points N used in the grid. Such details need to be understood in order to perform detailed numerical calculations. Another requirement is the addition of a lot of physics works on an unstructured grid. Some ideas about how to proceed to include a self consistent solution for the temperature are presented.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:30
Last Modified: 15 Feb 2018 07:30

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