Acknowledgments

● Visualization refers to the use of (computer based) graphical abstractions to help users to gain insights into the real-world phenomena represented by the data. ● Visualization is useful for a preliminary exploration of the data, for the following in-depth analysis and for the final presentation of the findings. ● Flow Visualization is concerned with the representation of flow phenomena. ● Flow data can be expressed in different forms, leading to different kinds of visual representation (e.g., a. Hedgehog, b. Pathlines, c and d. Vortex core). Flow Visualization and Energy-Scales ● Flow fields naturally consist of different energy-scales, with different roles in its dynamics, ranging from transport to the dissipative scales. ● In order to understand the role of a visualized structure in the flow field, it is important to understand which scale the structure acts on. ● Some scales may hide structures present in others (cf. right figure. Top: vortical structures in the original field. Bottom: vortical structures associated to the highly energetic scales). ● In our paper [1], we extract structures at different energy-scales, combining classical flow visualizations with proper orthogonal decomposition