VMV12

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/1016

Browse

Browsing VMV12 by Subject "Applications"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Analysis of Vortex Merge Graphs
    (The Eurographics Association, 2012) Kasten, Jens; Zoufahl, Andre; Hege, Hans-Christian; Hotz, Ingrid; Michael Goesele and Thorsten Grosch and Holger Theisel and Klaus Toennies and Bernhard Preim
    We propose an analysis framework to investigate different flow quantities such as vorticity, λ<sub>2</sub> or the acceleration magnitude along vortex merge graphs and within their regions of influence. The explicit extraction of vortex merge graphs enables the application of statistical tools to investigate the vortex core lines themselves. The analysis tool provides common plots as scatter plots and parallel coordinates to explore the correlation of different quantities. An abstract representation of the vortex merge graph highlights birth, death and merges of vortices. Interactive picking of substructures supports a closer insepection of single vortices and their evolution. A further step integrates the regions of influence into the statistical analysis. Minima, maxima, median, mean and other percentiles of the measures along the vortex merge graph and its regions are visualized. The usability of the framework is demonstrated using a simulated flow data set of a mixing layer and a jet.
  • Thumbnail Image
    Item
    Visualizing Solar Dynamics Data
    (The Eurographics Association, 2012) Machado, Gustavo M.; Sadlo, Filip; Müller, Thomas; Müller, Daniel; Ertl, Thomas; Michael Goesele and Thorsten Grosch and Holger Theisel and Klaus Toennies and Bernhard Preim
    Solar dynamics data, particularly those from the Solar Dynamics Observatory, are now available in a sheer volume that is hard to investigate with traditional visualization tools, which mainly display 2D images. While the challenge of data access and browsing has been solved by web-based interfaces and efforts like the Helioviewer project, the approaches so far only provide 2D visualizations. We introduce the visualization of such data in the full 3D context, providing appropriate coordinate systems and projection techniques. We also apply and extend methods from volume rendering and flow visualization to 3D magnetic fields, which we derive from the sensor data in an interactive process, and introduce space-time visualization of photospheric data. Here, we concentrate on two solar phenomena: the structure and dynamics of coronal loops, and the development of the plasma convection in close vicinity of sunspots over time. Our approach avoids the time-coherence issue inherent in traditional magnetic field line placement, providing insight in the magnetic field and the structure of the coronal plasma. We are convinced that the presented techniques are applicable in many other fields such as the terrestrial magnetospheric physics, or magnetohydrodynamics simulations.