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Ronny Peikert, Martin Roth, Andreas Sebestyén
Our field of application, CFD simulations of hydraulic turbomachinery, is
particularly demanding.
Flows in water turbines and pumps have fully developed turbulence,
are constrained in curved channels of complex geometry and exhibit
large downstream pressure gradients and high shear.
In addition, commonly used grids have some properties usually not
supported in general-purpose visualization packages,
such as multi-block structured grids, rotational symmetry and zones
moving relative to each other (e.g. stator and runner).
The machines are highly optimized, with efficiencies exceeding 93%.
Industrial simulations usually solve for steady (time-averaged)
solutions of the Navier-Stokes equations.
Typical vortices in such flows are weak,
yet these vortices are of particular interest to the engineers
developing these turbomachines.
Extracting vortices is thus the most important step of a feature-based
visualization for this task.
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Feature
extraction in scientific visualization is traditionally
described in a rather procedural type of language.
This is in contrast to basic visualization techniques such as slices,
isosurfaces, integral curves (streamlines) or stream functions.
These can be specified by simple algebraic equations or ordinary
differential equations,
so there is no question that one can carefully distinguish between the
mathematical definition and the extraction algorithm.
The same level of abstraction has not yet been reached in the area of
feature extraction.
- M. Roth, Automatic Extraction of Vortex Core Lines and Other Line-Type Features for Scientific Visualization, ETH Dissertation no. 13673, Hartung-Gorre Verlag, 2000.
[PDF] [BibTeX]
- R. Peikert, M. Roth, The 'Parallel Vectors' Operator - A Vector Field Visualization Primitive, Proceedings of IEEE Visualization '99, (San Francisco, CA, USA, October 24-29, 1999), IEEE Computer Society Press, pp. 263-270, 1999.
[PDF] [BibTeX]
- M. Roth, R. Peikert, Higher-Order Method For Finding Vortex Core Lines, Procceedings of IEEE Visualization '98 (Research Triangle Park, NC, USA, October 19-20, 1998) pp. 143-150 1998.
[PDF] [BibTeX]
- M. Roth, R. Peikert, Flow Visualization for Turbomachinery Design, Proceedings of IEEE Visualization '96, (San Francisco, CA, USA, October 1996, Best Case Study Award), IEEE Computer Society Press pp. 381-384 1996.
[PDF] [BibTeX]
- M. Roth, A Visualization System for Turbomachinery Flow, SCSC Technical Report TR-96-05, ETH Zurich, April 1996.
[PDF] [BibTeX]
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