Movies of the 1.5 x 107 g/cc 216 cm wide R-T flame
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| temperature | carbon destruction rate | carbon mass fraction | vorticity |
| [WMV7 AVI] | [WMV7 AVI] | [WMV7 AVI] | [WMV7 AVI] |
(Bell, J. B., Day, M. S., Rendleman, C. A., Woosley, S. E. & Zingale, M. A. 2004, ApJ, in preparation.)
in collaboration with the CCSE/LBL group.
Simulations of a fully resolve 1.5 x 107 g/cc RT unstable carbon flame in a white dwarf. The domain is 216 x 432 cm (effective, fine grid size is 2048 x 4096 zones). The flame is moving up, and fresh fuel is fed in at the top at the laminar flame velocity.
See our previous study for flames at other densities. This current domain is 4x wider than the 1.5 x 107 g/cc flame presented there.
Movies of the 1.5 x 107 g/cc 216 cm wide R-T flame
|
|
|
|
| temperature | carbon destruction rate | carbon mass fraction | vorticity |
| [WMV7 AVI] | [WMV7 AVI] | [WMV7 AVI] | [WMV7 AVI] |
Presently, we are working on thickened flame calculations of these large domain runs. Thick flames is a simple flame model whereby the conductivity and energy generation rate are adjusted to yield a flame that moves at the resolved laminar speed, but is considerably thicker than the laminar flame. This allows for flame simulations to use less resolution that demanded by the true flame. Thickening has its disadvantages though---the effects of curvature on the flame are misrepresented when you thicken, and turbulence interactions of scales less than the thickened flame width are unaccounted for. To correct for these dificiencies, a subgrid model is needed. In this study, we are able to directly compare different thick flame models to the resolved calculation---such validation for astrophysical flames has never been done before, and is critical to producing a true flame model.
notes:
AVI movies encoded with mencoder 0.90-4.0 from 32-bit PNGs using:
mencoder "mf://plt????.C21_med.png" -ovc lavc -lavcopts vcodec=wmv1:vbitrate=16000 -o rt_1.5e7_big_lowres_yc12.avi -mf w=256:h=512:fps=25:type=png