Difference between revisions of "ET Workshop Fall 2011 RAD"
| Line 13: | 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 | + | * Two-Moment-Scheme / Truncated moment scheme |
| − | ** | + | ** start with Boltzmann equation |
| − | ** | + | ** decompose into moments |
| − | ** | + | ** truncate series |
| − | ** close using some prescription | + | ** close using some prescription (approximate the rest of the series) |
| + | * Monte-Carlo | ||
Revision as of 15:51, 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 scheme
- start with Boltzmann equation
- decompose into moments
- truncate series
- close using some prescription (approximate the rest of the series)
- Monte-Carlo
