Difference between revisions of "ET Workshop Fall 2011 RAD"
| Line 1: | Line 1: | ||
Possibilities | Possibilities | ||
| + | * Leakage scheme | ||
| + | ** very ad-hoc | ||
| + | ** only mimicks loss due to radiation | ||
* Diffusion equation | * Diffusion equation | ||
** accurate only when mean free path is really short | ** accurate only when mean free path is really short | ||
| Line 10: | Line 13: | ||
** limits radiation speed: ad-hoc | ** limits radiation speed: ad-hoc | ||
** also not very accurate | ** also not very accurate | ||
| + | * Two-Moment-Scheme / Truncated moment | ||
| + | ** Start with Boltzmann equation | ||
| + | ** Decompose into moments | ||
| + | ** Truncate series | ||
| + | ** close using some prescription | ||
Revision as of 15:49, 2 November 2011
Possibilities
- Leakage scheme
- very ad-hoc
- only mimicks loss due to radiation
- Diffusion equation
- accurate only when mean free path is really short
- almost always implicit to avoid strong CFL limit
- cheap, usually inaccurate
- Flux limited diffusion
- Diffusion + "trick" at lower optical depths
- also simple, and has been used for supernovae simulations
- unclear if working in GR
- limits radiation speed: ad-hoc
- also not very accurate
- Two-Moment-Scheme / Truncated moment
- Start with Boltzmann equation
- Decompose into moments
- Truncate series
- close using some prescription
