CND with cooling and B-field - Marvin

This simulation of the CND was done with a vertical initial magnetic field with 100 microgauss. The first Animation shows the 3D mass density, after approx. half of the time the disk (at least the inner part) reaches a more or less settled state. However, there is a warping of the disk, but we have already seen this in the simulations without magnetic field. The second animation shows a face-on view of the mass density, a spiral pattern develops, but this feature is also present in simulations without magnetic field, as is the feature in the third animation, which shows the edge-on view of the gas velocity and the development of an outflow. The fourth and fifth Animations show edge-on and face-on views of the magnetic energy density with streamlines. The initially vertical field gets transformed into a toroidal field, the ambient medium hosts a chaotic magnetic field. The field strength in the disk reaches values of about 1 mG, which is indeed observed in the CND. So I think an initial field strength of 100 microgauss is a good choice. The magnetic field does not have a large effect on the gas density, as we see in the last Animation, which shows a face-on view of the beta parameter. It is almost always greater than one.

​Animation of the 3D mass density

​Animation of the mass density (face-on)

​Animation of the gas velocity (edge-on)

​Animation of the magnetic field (face-on)

​Animation of the magnetic field (edge-on)

​Animation of the beta-parameter (face-on)

3D gas density:

Gas velocity (edge-on):

Beta parameter (face-on):

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