Visualizing magnetic field lines - Revision history

Rhaas: add conn_cmfe example

2019-11-06T15:40:17Z

add conn_cmfe example

Rhaas: fix some layout of code lines

2019-11-06T15:17:24Z

fix some layout of code lines

Rhaas: ad final picture, resize images

2012-09-12T21:07:29Z

ad final picture, resize images

Rhaas: short notes on how to create field lines plots

2012-09-12T20:59:01Z

short notes on how to create field lines plots

New page

For the ET MHD paper, I wanted to visualize magnetic field lines as done in figure 4 of [http://adsabs.harvard.edu/abs/2003A%26A...400..397D 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 [https://svn.einsteintoolkit.org/documents/Paper_EinsteinToolkit_GRMHD/rotor/].

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...)
<code>
{<HYDROBASE--Bvec_lb_0_rb_>,<HYDROBASE--Bvec_lb_1_rb_>,<HYDROBASE--Bvec_lb_2_rb_>}
</code>
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
[[Image:streamlineoptions.png]]
* you can find the full settings in the session file in the rotor repository [https://svn.einsteintoolkit.org/documents/Paper_EinsteinToolkit_GRMHD/rotor/figs/fieldlines.session]

@@ Line 3: / Line 3: @@
 To visualize them, one has to do the "usual VisIt" stuff to get a vector into VisIt. Ie.
-* open the file in VisIt
+* if all vector components are in a single set of files then
-* create a new vector Expression (Control/Expressions...)
+** open the file in VisIt and
 <pre>
    {<HYDROBASE--Bvec_lb_0_rb_>,<HYDROBASE--Bvec_lb_1_rb_>,<HYDROBASE--Bvec_lb_2_rb_>}
 </pre>
-that combines the three components into a single vector (the precise names of the scalars differ from version to version in VisIt).
+* if the vector components are in different sets of files <code>bvec[0]</code>, <code>bvec[1]</code>, <code>bvec[2]</code> then
 * add a "Streamline" plot and the "Project" operator
 * set the streamline options as shown below

@@ Line 11: / Line 11: @@
 * add a "Streamline" plot and the "Project" operator
 * set the streamline options as shown below
-[[Image:streamlineoptions.png]]
+[[Image:streamlineoptions.png|1024px]]
 * you can find the full settings in the session file in the rotor repository [https://svn.einsteintoolkit.org/documents/Paper_EinsteinToolkit_GRMHD/rotor/figs/fieldlines.session]