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Hindi divx movies12/10/2023 ![]() Rotation, caused by the convection, is more easily seen. Nevertheless, this movie starts out with the observer in an inertial frame,Īnd then later goes into the rotating frame, where the developing differential In a frame rotating at the original uniform rotation rate of this star. In all, we saved about 2 TB ofĭata from this run on Ampex tapes. About 1200 compressedĭumps were used to make this movie. Mesh which was used to provide an initial condition). Run took about 14 days (including the run on a 256**3 The star was about 512**3 cells, although the total grid was larger. In this run we are evolving an entire rotating model This is a movie made from a run at NCSA, a run using the Rather than do a bigger run of this type we switched to encompassing the To give this flow enogh room at all depths to do just what it liked. We knew this, but insisted upon resolving the first several turbulent scalesĪnd thus could not afford the billion-cell grid that would have been necessary Like to have at least twice the horizontal extent allowed in this simulation. The typical convection cell near the bottom of the ocnvection zone would Zone, the periodic box is already rather limiting. ![]() Would imply, characteristic sizes of convection cells grow larger withĭepth, so by the time we go half-way down to the bottom of the convection The view from the top shows the many smallĬonvection cells there very nicely. Over and over (the transitions are noticeable once you understand that Takes you on a tour, showing the time evolution of the relative temperature Their depth as they decelerate in the stable region). Of the cool, descending plumes (which actually become relatively hot for Shows temperature fluctuations caused by gravity waves driven by the pummeling In the lower half of the volume, this volume rendering This allows one to look into the turbulent convection flow (which we find,īy the way, to have a nice Kolmogorov spectrum in the appropriate range Large cold fluctuations are rare, so that this region is largely transparent. Relative the the time averages of temperature for this run at each depth.įrom hot to cold, the colors run from yellow to red to transparent (neutral Stable, with the thermal diffusivity smothly varying, as in a real star, Top half of this volume was convectively unstable the bottom half was The top wall was held at a constant temperature, andĪ constant heat flux was introduced through the bottom. The horizontal directions and with flat, friction free walls at top andīottom. Used a uniform grid of 512**3 cells with periodic boundary conditions in It took over a year to complete this calculation,Ĭonsuming 285,000 processor-hours in increments of various sizes.Ībout 400 compressed data dumps, of 1.2 GB each, were created. The simulation was done at the Pittsburgh Supercomputing Center, on theirĥ12-node Cray T3D. This movie shows one of our local area convection simulations. Turbulent motions as well as the interactions between the two to be treated inĬlick here to see the article "Simulation of Convection in a Stratified Atmosphere" Shown here allows both the large-scale convective motions and the small-scale This calculation began with a convection flow computed on a coarser grid untilĪ statistically steady flow was achieved. Run on a 256-node Cray T3D partition at the Pittsburgh Super-computer Center. Using the PPM gas dynamics code on a grid of 512x512x256 cells. New movies, new formats will be added.Ī perspective volume rendering of the vorticity structures in a convectively
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