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Solar granulation in 3D
This movie (click!) shows the development of solar granulation as simulated in extreme resolution. The isosurface T = 6000K is coloured with vertical momentum (red: downwards, blue: upwards). The domain is 1.2 Mm wide. The grid size is about 2.5 km in each direction. Starting from a previous model with less resolution (7.4 km in the horizontal, the simulation shows in the course of time, as the higher numerical resolution takes effect, the rich fine-structure of the turbulence, in particular in the downflow area.
Cepheid in 2D
This is a snapshot of the upper convection zone (H+HeI) of a cepheid model. Colours: convective flux. The picture shows only the uppermost part of our calculation which spans the outermost 42% of the star.
Solar granulation in 3D -- vortex tubes
The movie (start movies by clicking images) shows solar granulation in extremely high resolution (grid-size about 2.5 km). It starts from a lower resolution state, and turbulence is seen to fully develop. In the center of the domain there is a downflow, ascending granular flow is near the border. Note the large number of vortex tubes developing.
This picture shows density variations in a horizontal cut near the surface.
Solar granulation in 2D
A 2D simulation pic in normal resolution (temperature); horizontal box
width 11Mm; horizontal numerical cell width 11km. This time no movie.
Movies again: a high resolution run; horizontal box width 2.6Mm;
horizontal numerical cell width 2.6km.
Again high resolution. Colours: log(T) minus horizontal average; black
lines: isovalues of log(p) minus horizontal average. Note the generation
and propagation of acoustic pulses.