Meeting Update 03-31

Colliding Flows

  • High Resolution (~800 ppi for color, ~300 ppi for b&w) Figures made: CDMs (0, 15, 30, 60), InvBeta (0, 15, 30, 60), B vs. n (0, 15, 30, 60), Spectra (0, 15, 30, 60), Mass History (0), Model of Flows
  • HR Figures to be made: Mass History (15, 30, 60), Histograms for sinks (We are thinking about these three figures I made: ​1, ​2, ​3)
  • Querying for the mass history is a pain in the ass in VisIt and could take over a week. I am just going to make a post processing executable and run quick jobs on the simulations to pull the information of the rho in the box and simulation out.
  • In the past few weeks I have learned a significant amount about what goes into preparing figures for publication. Not a trivial task. Visit exports pseudo-vectorized images. Exporting as an EPS is an option in Visit, but when you zoom in on the printed figure there is no scalability. So I saved visualizations done in Visit as high resolution PNGs and converted them to PDF (ImageMagick rasterizes, but that won't matter if we save as a PNG anyway). Some other softwares can export actual vectorized images. These you don't want to touch with ImageMagick (use ghostscript instead). So we have a bunch of really heavy figures. I wrote a script on how to compress them, see ​here. Erica wants me to document all of the stuff I learned.

Shape

Meeting Marcus Freeman, an RIT graduate student, on the week of the 6th to work on Shape. Will post about the outcome of that meeting afterword. Before then I should probably work on regridding the simulation so it has the necessary variables we would like?

Turbulence Simulations


​GIF
Met with Jonathan last week. He handed over the problem module and .data files. Suggested I make a 2D simulation first, so I did this over the weekend. Looks as expected: clump and wind. Hot desaturated really makes the shock stand out. There is a weak magnetic field (beta = 100) and MHD is turned on.

Space is minimal on Bamboo and Grass, so I ran this simulation using 4 processors on Clover (which is only being used about 56%). It took all weekend and has 6 more frames to go. I am going to start moving over to a more powerful machine, like BS or BH2. The configure file is having issues on BS (see Baowei's e-mail).

Here are some of the parameters in the problem.data we'll be considering for the study: 

&ProblemData
spacing=.2           ! Lattice constant
thickness=.03        ! Radius of wire
beta=100             ! magnetic beta
mach=20              ! mach number
screen_x=.25         ! location of screen in x
rho_wire=1000d0       ! peak density of screen
rho_wind=1d0     ! density of wind
rho_amb=.01          ! ambient density
/

We could vary the beta and mach, or the spacing and thickness of the wires. I suppose we'll see once I get some jobs set up and the code made on BH2.

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