The Vetter-Sturtevant shocktube experiments: - Two gases, air and SF6, initially separated by a membrane inside a tube, are mixed by the passage of a strong shock through the interface between them. - Used as a test of our continuous adaptive mesh refinement code RAGE. How can you compare different 3D simulations of these experiments? Use EnSight and Python to perform a dimensional reduction of the 3D simulation data: -Use Python script with EnSight to place an integration plane at positions along the tube axis oriented perpendicular to the axis. - At each position EnSight computes the mix parameter by integration over the plane and returns the result to Python. - In this way a 1D plot of the mix parameter vs position is generated at each time. - 3D mix is reduced to a plot of the1D mix parameter vs position that can be compared between simulations over time. - EnSight is used to integrate the mix parameter along the axis and plot the result over time. - Animate everything together on the same image to study the quantitative evolution of the shock induced mixing. Simulation courtesy of F. Grinstein, LANL

 

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The supernova itself was the violent death of a star.  The explosion causes a shock wave that travels out into the surrounding interstellar medium and is observable for tens of thousands of years.  The shock wave churns and mixes the interstellar gases with the materials created in the supernova explosion.  Supernovae are actually the only place in the universe that elements heavier than iron can be created.  The resulting shockwave helps carry this material outward and distribute it through space.  Any element on earth heavier than iron was created in an ancient supernova.

 

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Image portrays a 3D display providing an orientation view for corresponding images with MODIS (Moderate Resolution Imaging Spectroradiometer) and CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) satellites.  Night time observations of attenuated backscatter at 532 nm overlayed combined MODIS Aqua and Terra observations.  Vertical profiles extend to 20 km.  Aerosol features are highlighted in colors ranging from cyan through red.  Clouds are highlighted by shades of gray.

Interesting features:
Aerosol plume over India corresponds with MODIS observations (note slightly different color bars between satellite data sets).

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In the Department of Chemical Engineering and Materials Science at the University of Minnesota (UMN), Ph.D. candidate David Gasperino and Senior Research Associate Andrew Yeckel, Ph.D., working under the supervision of Professor Jeffrey Derby, are incorporating EnSight extreme 3D visualization software from CEI, Inc. of Apex, NC into a project that, much like the crystals they study, is a building block for future research. Their work is supported by the National Science Foundation MRSEC Program and a Grant-in-Aid of Research, Artistry and Scholarship from UMN. This image above are the results from a fluid-structure interaction of the fluid cell and cantilever system and shows the maximum deflection of the cantilever away from the scanning sample for a particular flow rate. To read the full story, click on the title, "Minnesota Chemical Engineers Study Crystal Growth with Extreme Simulations."

 

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Dynamic simulation of Richtmyer Meshkov instability growth in a shocked gas interface with multi-mode initial perturbation. Animation courtesy of Robert Greene, Los Alamos National Laboratory.

 

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