Interactive visualization of droplet dynamic processes
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The long term goal of this project is the development of new and improved algorithms and methods that allow for interactive visualization of large, time-dependent simulation and experimental data in the context of droplet dynamic processes. During the second funding period we focus on the development of new methods for the analysis of single droplets and droplet groups in the presence of electric fields, as well as for the analysis of phase transitions and transport of energy. Additionally, a foundation should be laid for the investigation of sprays, where the challenge lies in the enormous amount of droplets. Specialized techniques for drop impingement and molecular dynamics simulations complete this project.
Numerical flow visualization is the computer-based equivalent to experimental flow visualization. Initially, experimental procedures were modelled and thus their virtual counterparts were made available for the simulation data. Today, a lot of the visualization methods exceed such a modelling - many of the techniques used today cannot be realized experimentally or only with great difficulties. Great advantages of numerical visualizations are the fact that the costly experimental setups are not needed and that visual analyses do not affect the flow. Despite substantial progress in the field of computational flow visualization, more elaborate visualization techniques are still required to handle both the ever-increasing complexity of simulation and experimental data, and the more sophisticated physical phenomena being investigated. Particularly, new visual tools are necessary for the analysis of large droplet groups and sprays, as well as for the various physical phenomena investigated in SFB-TRR 75.
Building on the developed methods for the analysis of the electric fields on the droplet interface and the drop dynamics, visualization techniques for time-dependent interaction of fluid, charges and electric fields should be developed. The visualization of phase transitions constitutes an essential research area within SFB-TRR 75. Processes such as evaporation and icing, and the interplay between the processes and gas flow should be analyzed, with further extension to the context of drop impingement. Additionally, the method for the visualization of piecewise linear interface calculation, developed in the first funding period, should be examined in terms of its applicability to the simulation. The visual analysis of energy transport is related to the visualization of the phase transitions, also in the context of the three-phase contact line. For the investigation of the prevalent phenomena present during the droplet impingement, visualization methods should be researched, including the methods for energy transport. The visualization of space-time structure of sprays, visualization of molecular dynamics simulations, and the combination of the techniques developed in this funding period complete this project.
Heinemann, M., Frey, S., Tkachev, G., Straub, A., Sadlo, F., Ertl, T.:
Visual analysis of droplet dynamics in large-scale multiphase spray simulations.
Journal of Visualization 24.5 (2021), pp. 943-961.
Schatz, K., Müller, C., Gralka, P., Heinemann, M., Straub, A., Schulz, C., Braun, M., Rau, T., Becher, M., Frey, S., Reina, G., Sedlmair, M., Weiskopf, D., Ertl, T., Diehl, P., Marcello, D., Frank, J., Müller, T.:
2019 IEEE Scientific Visualization Contest Winner: Visual Analysis of Structure Formation in Cosmic Evolution.
IEEE Computer Graphics and Applications (2020), pp. 1-1.
Straub, A., Heinemann, M., Ertl, T.:
Visualization and Visual Analysis for Multiphase Flow.
Proceedings of the DIPSI Workshop 2019: Droplet Impact Phenomena & Spray Investigations. 2019, pp. 25-27.
Schatz, K., Diehl, P., Marcello, D., Frank, J., Muller, T., Frey, S., Reina, G., Weiskopf, D., Ertl, T., Muller, C., Gralka, P., Heinemann, M., Straub, A., Schulz, C., Braun, M., Rau, T., Becher, M.:
Visual Analysis of Structure Formation in Cosmic Evolution.
2019 IEEE Scientific Visualization Conference (SciVis). 2019, pp. 33-41.
Karch, G. K., Beck, F., Ertl, M., Meister, C., Schulte, K., Weigand, B., Ertl, T., Sadlo, F.:
Visual Analysis of Inclusion Dynamics in Two-Phase Flow.
IEEE Transactions on Visualization and Computer Graphics 24.5 (2018), pp. 1841-1855.
Hempert, F., Boblest, S., Ertl, T., Sadlo, F., Offenhäuser, P., Glass, C., Hoffmann, M., Beck, A., Munz, C.-D., Iben, U.:
Simulation of real gas effects in supersonic methane jets using a tabulated equation of state with a discontinuous Galerkin spectral element method.
Computers & Fluids 145 (2017), pp. 167-179.
Boblest, S., Hempert, F., Hoffmann, M., Offenhäuser, P., Sonntag, M., Sadlo, F., Glass, C. W., Munz, C.-D., Ertl, T., Iben, U.:
Toward a Discontinuous Galerkin Fluid Dynamics Framework for Industrial Applications.
High Performance Computing in Science and Engineering · 15. 2016, pp. 531-545.
Ertl, M., Weigand, B., Karch, G. K., Sadlo, F., Ertl, T.:
Investigation and visual analysis of direct simulations of quasi-steady primary break-up of shear thinning liquids.
Proceedings 9th International Conference on Multiphase Flow. 2016
Hempert, F., Boblest, S., Hoffmann, M., Offenhäuser, P., Sadlo, F., Glass, C. W., Munz, C.-D., Ertl, T., Iben, U.:
High-Pressure Real Gas Jet and Throttle Flow as a Simplified Gas Injector Model Using a Discontinuous Galerkin Method.
High Performance Computing in Science and Engineering · 16. 2016, pp. 289-300.
Karch, G. K., Sadlo, F., Weiskopf, D., Ertl, T.:
Visualization of 2D unsteady flow using streamline-based concepts in space-time.
Journal of Visualization 19.1 (2016), pp. 115-128.
Machado, G., Boblest, S., Ertl, T., Sadlo, F.:
Space-Time Bifurcation Lines for Extraction of 2D Lagrangian Coherent Structures.
Computer Graphics Forum 35.3 (2016), pp. 91-100.
Bolemann, T., Üffinger, M., Sadlo, F., Ertl, T., and Munz, C.-D.:
Direct Visualization of Piecewise Polynomial Data.
IDIHOM: Industrialization of High-Order Methods - A Top-Down Approach: Results of a Collaborative Research Project Funded by the European Union, 2010-2014. 2015, pp. 535-550.
Karch, G. K., Sadlo, F., Weiskopf, D., Ertl, T.:
Streamline-Based Concepts for Space-Time Analysis of 2D Time-Dependent Flow.
16th International Symposium on Flow Visualization. 2014
Mwalongo, F., Krone, M., Karch, G., Becher, M., Reina, G., Ertl, T.:
Visualization of molecular structures using state-of-the-art techniques in WebGL.
Proceedings of the 19th International ACM Conference on 3D Web Technologies. 2014, pp. 133-141.
Sadlo, F., Karch, G. K., Ertl, T.:
Topological Features in Time-Dependent Advection-Diffusion Flow.
Topological Methods in Data Analysis and Visualization III. 2014, pp. 217-231.
Hlawatsch, M., Sadlo, F., Weiskopf, D.:
Predictability-Based Adaptive Mouse Interaction and Zooming for Visual Flow Exploration.
International Journal for Uncertainty Quantification 3.3 (2013), pp. 225-240.
Karch, G. K., Sadlo, F., Meister, C., Rauschenberger, P., Eisenschmidt, K., Weigand, B., Ertl, T.:
Visualization of piecewise linear interface calculation.
2013 IEEE Pacific Visualization Symposium (PacificVis). 2013, pp. 121-128.
Karch, G. K., Sadlo, F., Songoro, Gjonaj, E., Weiland, T., Ertl, T.:
Visualizing Edge-Conforming Discrete Field Quantities in Electromagnetic Field Problems with Interfaces.
25th European Conference on Liquid Atomization and Spray Systems. 2013
Uffinger, M., Sadlo, F., Ertl, T.:
A Time-Dependent Vector Field Topology Based on Streak Surfaces.
IEEE Transactions on Visualization and Computer Graphics 19.3 (2013), pp. 379-392.
Frey, S., Sadlo, F., Ertl, T.:
Visualization of Temporal Similarity in Field Data.
IEEE Transactions on Visualization and Computer Graphics 18.12 (2012), pp. 2023-2032.
Karch, G. K., Sadlo, F., Weiskopf, D., Munz, C.-D., Ertl, T.:
Visualization of Advection-Diffusion in Unsteady Fluid Flow.
Computer Graphics Forum 31.3pt2 (2012), pp. 1105-1114.
Karch, G. K., Sadlo, F., Weiskopf, D., Hansen, C. D., Li, G.-S., Ertl, T.:
Dye-Based Flow Visualization.
Computing in Science Engineering 14.6 (2012), pp. 80-86.
Hlawatsch, M., Sadlo, F., Weiskopf, D.:
Hierarchical Line Integration.
IEEE Transactions on Visualization and Computer Graphics 17.8 (2011), pp. 1148-1163.
Pagot, C., Osmari, D., Sadlo, F., Weiskopf, D., Ertl, T., Comba, J.:
Efficient Parallel Vectors Feature Extraction from Higher-Order Data.
Computer Graphics Forum 30.3 (2011), pp. 751 760.
Pagot, C., Vollrath, J., Sadlo, F., Weiskopf, D., Ertl, T., Comba, J. L. D.:
Interactive Isocontouring of High-Order Surfaces.
Scientific Visualization: Interactions, Features, Metaphors. Vol. 2. 2011, pp. 276-291.
Sadlo, F., Üffinger, M., Pagot, C., Osmari, D., Comba, J., Ertl, T., Munz, C.-D., Weiskopf, D.:
Visualization of Cell-Based Higher-Order Fields.
Computing in Science & Engineering 13.3 (2011), pp. 84-91.
Falk, M., Seizinger, A., Sadlo, F., Üffinger, M., Weiskopf, D.:
Trajectory-Augmented Visualization of Lagrangian Coherent Structures in Unsteady Flow.
International Symposium on Flow Visualization (ISFV14). 2010