Visualizing magnetic field lines

For the ET MHD paper, I wanted to visualize magnetic field lines as done in figure 4 of DelZannaa 2002. For this I wanted to use VisIt on 2d hdf5 output (unigrid) from Carpet. The data and paremter files can be found in the MHD paper repository [1].

To visualize them, one has to do the "usual VisIt" stuff to get a vector into VisIt. Ie.

• open the file in VisIt
• create a new vector Expression (Control/Expressions...)

 {<HYDROBASE--Bvec_lb_0_rb_>,<HYDROBASE--Bvec_lb_1_rb_>,<HYDROBASE--Bvec_lb_2_rb_>}

that combines the three components into a single vector (the precise names of the scalars differ from version to version in VisIt).

• add a "Streamline" plot and the "Project" operator
• set the streamline options as shown below

• you can find the full settings in the session file in the rotor repository [2]