Parallel particle advection and FTLE computation for time-varying flow fields
SC '12 Proceedings of the International Conference on High Performance Computing, Networking, Storage and Analysis
Lagrangian coherent structures with guaranteed material separation
EuroVis'11 Proceedings of the 13th Eurographics / IEEE - VGTC conference on Visualization
Interactive analysis of cavity-flows in a virtual environment
Proceedings of the 28th Spring Conference on Computer Graphics
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In most fluid dynamics applications, unsteady flow is a natural phenomenon and steady models are just simplifications of the real situation. Since computing power increases, the number and complexity of unsteady flow simulations grows, too. Besides time-dependent features, scientists and engineers are essentially looking for a description of the overall flow behavior, usually with respect to the requirements of their application domain. We call such a description a flow structure, requiring a framework of definitions for an unsteady flow structure. In this article, we present such a framework based on pathline predicates. Using the common computer science definition, a predicate is a Boolean function, and a pathline predicate is a Boolean function on pathlines that decides if a pathline has a property of interest to the user. We will show that any suitable set of pathline predicates can be interpreted as an unsteady flow structure definition. The visualization of the resulting unsteady flow structure provides a visual description of overall flow behavior with respect to the user’s interest. Furthermore, this flow structure serves as a basis for pathline placements tailored to the requirements of the application.