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Dipl. Inf. Markus Üffinger

Dipl.-Inf. Dr. Markus Üffinger

Büro: Informatikgebäude 1.469

Universität Stuttgart
Universitätsstraße 38
70569 Stuttgart

Telefonnummer: +49 (711) 685-88251

Telefaxnummer: +49 (711) 685-88340

E-Mail-Adresse: Markus.Ueffinger@vis.uni-stuttgart.de

Research

I am working on the research project Interactive Visualization of Multi-scale, Multi-physics Simulations, which is part of the Cluster of Excellence Simulation Technology (SimTech). The long-term goal is to develop algorithms and techniques which will allow interactive visualization of the simulations carried out within the project network Multi-scale Multi-physics Modeling of Multi-Phase Fluids and Materials. My research focuses on direct visualization and feature extraction techniques for field data from fluid dynamics simulation (CFD). Direct visualization results in accurate representations of the complex raw field data, with interactive GPU-based algorithms enabling an efficient data exploration. Feature-based techniques can additionally support the user with an automatic analysis:

Media (click images to enlarge)

  • Interactive High-Quality Visualization of Higher-Order Finite Elements [2010]



  • Higher-order finite elements (FEM) and discontinuous Galerkin (DG) simulations use varying polynomial degree and adaptive domain discretization. This results in complex polynomial flow data which can not be handled directly by traditional visualization techniques. An accurate direct visualization is possible with our adaptive GPU raycasting technique (CUDA). Distributed rendering (MPI) enables interactive display rates for larger data sets.


    Higher-order direct volume rendering (DVR) of fluid density around a sphere obstacle. The polynomial data is given on a hybrid non-conforming unstructured grid.
  • A Time-Dependent Vector Field Topology Based On Streak Surfaces [2012]

    Vector field topology can reduce the vast amount of raw simulation data to its essential structure. The resulting abstract representations help in understanding complex flow characteristics.

     

    Streak surface topology: van Karman vortex street

    Gyre-Saddle
    YouTube, MP4

    Kármán vortex street
    YouTube, MP4

    Our streak LCS (bluish surfaces) match to LCS from FTLE ridges (blue lines on cutting plane).
  • More Flow Visualization

  • Seeding streamlines near feature surfaces highlights important flow regions and avoids visual clutter. Interactive placement additionally supports exploration [GPU-based streamlines, 2008].


    Higher-order volume rendering of turbulent DG CFD solutions reveal all detail of the polynomial data. Even the discontinuities of the simulation approach are clearly visible.




    Lagrangian coherent structures (LCS) (the red and the blue surfaces) separate unsteady flow into regions of different flow behavior. LCS are a building block of our time-dependent topology.

    Interactive DVR of a shock wave in a channel with a simple obstacle. The discretization consists of a rather small number of high order DG elements (video: MP4).


    The ridges (generalized local maxima) of finite-time Lyapunov exponent (FTLE) fields indicate regions of maximum flow separation (here, the red lines). FTLE ridges can represent LCS, characteristics structures of the field.

    Direct pixel-exact visualization of particle-partition of unity simulations (generalized FEM, high order and enrichment functions) is superior to traditional resampling approaches. The technique uses GPU shaders to enable interactive display rates [2011].

Publications

2014

Bolemann, Thomas; Üffinger, Markus; Sadlo, Filip; Ertl, Thomas; Munz, Claus-Dieter: Direct Visualization of Piecewise Polynomial Data. In: (Noch nicht erschienen).
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]

2013

A Time-Dependent Vector Field Topology Based on Streak Surfaces
Üffinger, Markus; Sadlo, Filip; Ertl, Thomas: A Time-Dependent Vector Field Topology Based on Streak Surfaces. In: IEEE Transactions on Visualization and Computer Graphics: Ausgabe 19, Nr. 3 (2013), S. 379-392.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]
Üffinger, Markus; Sadlo, Filip; Munz, Claus-Dieter; Ertl, Thomas: Toward Wall Function Consistent Interpolation of Flow Fields . In: EuroVis (Short Papers), S. 85-89, 2013.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]
Üffinger, Markus: Advanced visualization techniques for flow simulations : from higher-order polynomial data to time-dependent topology. Diss., Universität Stuttgart, Institut für Visualisierung und Interaktive Systeme, 2013.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]

2012

On the Finite-Time Scope for Computing Lagrangian Coherent Structures from Lyapunov Exponents
Sadlo, Filip; Üffinger, Markus; Ertl, Thomas; Weiskopf, Daniel: On the Finite-Time Scope for Computing Lagrangian Coherent Structures from Lyapunov Exponents. In: Topological Methods in Data Analysis and Visualization II (TopoInVis 2011), S. 269-281, 2012.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]
FTLE Computation Beyond First Order Approximation
Üffinger, Markus; Sadlo, Filip; Kirby, Mike; Hansen, Charles D.; Ertl, Thomas: FTLE Computation Beyond First Order Approximation. In: Eurographics 2012 (Short Papers) (Noch nicht erschienen).
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]

2011

Visualization of Cell-Based Higher-Order Fields
Sadlo, Filip; Üffinger, Markus; Pagot, Christian; Osmari, Daniel; Comba, João L. D.; Ertl, Thomas; Munz, Claus-Dieter; Weiskopf, Daniel: Visualization of Cell-Based Higher-Order Fields. In: Computing in Science & Engineering: Ausgabe 13, Nr. 3 (2011), S. 84-91.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]
Direct Visualization of Particle-Partition of Unity Data
Üffinger, Markus; Schweitzer, Marc A.; Sadlo, Filip; Ertl, Thomas: Direct Visualization of Particle-Partition of Unity Data. In: International Workshop on Vision, Modeling and Visualization, S. 255-262, 2011.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]

2010

Interactive High-Quality Visualization of Higher-Order Finite Elements
Üffinger, Markus; Frey, Steffen; Ertl, Thomas: Interactive High-Quality Visualization of Higher-Order Finite Elements. In: Computer Graphics Forum (CGF) Volume 29(2) (Euro Graphics 2010) Pages 115-136 (2010), S. 337-346.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]
Trajectory-Augmented Visualization of Lagrangian Coherent Structures in Unsteady Flow
Falk, Martin; Seizinger, Alexander; Sadlo, Filip; Üffinger, Markus; Weiskopf, Daniel: Trajectory-Augmented Visualization of Lagrangian Coherent Structures in Unsteady Flow. In: International Symposium on Flow Visualization (ISFV14), 2010.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]

2008

GPU-Based Streamlines for Surface-Guided 3D Flow Visualization
Üffinger, Markus; Klein, Thomas; Strengert, Magnus; Ertl, Thomas: GPU-Based Streamlines for Surface-Guided 3D Flow Visualization. In: Proceedings of Vision Modeling and Visualization 2008 (VMV 2008), S. 91-100, 2008.
[XPS] [PDF] [DOI] [OpenXML] [BibTeX] [Vortragsfolien] [Details]

Awards




Supervised Student Theses

open

  • Weitere Diplomarbeits-/Studienarbeitsthemen auf Anfrage.

finished