Brian W. O'Shea - Sedov-Taylor test problem

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The Sedov-Taylor test problem is a classic test of hydrodynamical algorithms. In this problem, a volume of uniform density and temperature is initialized, and a large quantity of thermal energy is injected at the center. This over-pressurized region rapidly develops into a cylindrical or spherical blast wave (in 2D or 3D), which is centered on the injection point and evolves in time in a self-similar fashion (see Sedov 1959). Deviations from self-similarity and from cylindrical or spherical symmetry are symptomatic of issues provide useful information about the properties of hydro codes in the strong-shock regime. The Enzo solution to this test problem matches the analytic result extremely closely (see, e.g., Tasker et al. 2008 or the Enzo method paper.)

The movies found below were created using a 2D simulation of the Sedov-Taylor test problem using version 2.4 of the Enzo code, and with this Enzo parameter file. The simulation is initialized on a 100x100 cell Cartesian root grid with two levels of adaptive mesh, with mesh refinement occurring based on the detection of shocks and on the local slope of the density and total energy variables. Links to the movies on YouTube are provided, but you can also directly download mp4 versions of the movies (which are around 6-10 MB apiece) via the links below the embedded YouTube movies, as well as the yt scripts used to make the movie frames from the Enzo simulation data. These scripts assume that you are using version 2.6 of the yt code - if you are using version 3.x, some small modifications will be necessary (consult the yt documentation for details). Note that all of the movies cover exactly the same time span, and use the same framerate. Movies were generated from individual frames using the ffmpeg tool.

Attribution: if you choose to use any of the movies or images on this site, please use the attribution: "(c) Brian O'Shea (MSU) and the Enzo Collaboration, 2014"

Gas density

mp4 movie, yt script

Gas density + AMR grid patches

mp4 movie, yt script

AMR grid patches

mp4 movie, yt script