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Journal of Visualization

, Volume 21, Issue 4, pp 625–636 | Cite as

A user-friendly interactive framework for unsteady fluid flow segmentation and visualization

  • Danilo Motta
  • Wallace Casaca
  • Paulo Pagliosa
  • Afonso Paiva
Regular Paper
  • 157 Downloads

Abstract

While vector fields are essential to simulate a large amount of natural phenomena, the difficulty to identify patterns and predict behaviors makes the visual segmentation in simulations an attractive and powerful tool. In this paper, we present a novel user-steered segmentation framework to cope with steady as well as unsteady vector fields on fluid flow simulations. Given a discrete vector field, our approach extracts multi-valued features from the field by exploiting its streamline structures so that these features are mapped to a visual space through a multidimensional projection technique. From an easy-to-handle interface, the user can interact with the projected data so as to partition and explore the most relevant vector features in a guidance frame of the simulation. Besides navigating and visually mining structures of interest, the interactivity with the projected data also allows the user to progressively enhance the segmentation result according to his insights. Finally, to successfully deal with unsteady simulations, the segments previously annotated by the user are used as a training set for a Support Vector Machine approach that classifies the remaining frames in the flow. We attest the effectiveness and versatility of our methodology throughout a set of classical physical-inspired applications on fluid flow simulations as depicted in the experiment results section.

Graphical Abstract

Keywords

Flow segmentation Time-varying visualization Vector field Interactive tools Machine learning 

Notes

Acknowledgements

We would like to thank Harsh Bhatia to kindly provide the results with Edge Maps (Bhatia et al. 2012). This research has been supported by FAPESP (São Paulo Research Foundation: grants #2013/07375-0; #2014/16857-0), and CAPES (PDSE #133553/2016-01).

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Copyright information

© The Visualization Society of Japan 2018

Authors and Affiliations

  1. 1.Universidade de São Paulo (USP), ICMCSão CarlosBrazil
  2. 2.Universidade Estadual Paulista (UNESP)RosanaBrazil
  3. 3.Universidade Federal de Mato Grosso do Sul (UFMS), FACOMCampo GrandeBrazil

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