Meeting Update 09.12

Implemented viscosity in full tensor form for isotropic fluid, which should be enough for our application. Also implemented the realistic viscosity which depends on the ion mean free path and averaged thermal velocity. The scheme now takes full consideration on the gradient of viscous tensor induced by different temperatures, which resulted from different ion thermal velocities between cells. This renders us the ability to solve problems with viscosity at temperature fronts. We may want to implement a table that look up the cross section for different types of ions, currently the ion mean free path is defaulted to the case of hydrogen. One thing worth considering might be different types of ions — the code currently defaults to one type of ion. For multiple species present at the same time, I am not sure how to get the averaged cross section and thus the viscosity tensor, yet. For a detailed description, see the updated resistive MHD project page. On the same page, there is also a comparing test between hydro RT vs viscous RT vs diffusive RT. The viscosity and diffusivity are both linear constant, and are purposely set to be comparable in value.

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