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Time-Dependent Visualization of Lagrangian Coherent Structures by Grid Advection

  • Filip SadloEmail author
  • Alessandro Rigazzi
  • Ronald Peikert
Chapter
Part of the Mathematics and Visualization book series (MATHVISUAL)

Abstract

Lagrangian coherent structures play an important role in the analysis of unsteady vector fields because they represent the time-dependent analog to vector field topology. Nowadays, they are often obtained as ridges in the finite-time Lyapunov exponent of the vector field. However, one drawback of this quantity is its very high computational cost because a trajectory needs to be computed for every sample in the space-time domain. A focus of this paper are Lagrangian coherent structures that are related to predefined regions such as boundaries, i.e. related to flow attachment and flow separation phenomena. It presents an efficient method for computing the finite-time Lyapunov exponent and its height ridges only in these regions, and in particular,grid advection for the efficient computation of time series of the finite-time Lyapunov exponent, exploiting temporal coherence.

Keywords

Root Mean Square Lyapunov Exponent Uniform Grid Sampling Grid Temporal Coherence 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Berlin Heidelberg 2011

Authors and Affiliations

  • Filip Sadlo
    • 1
    Email author
  • Alessandro Rigazzi
    • 2
  • Ronald Peikert
    • 2
  1. 1.VISUSUniversität StuttgartStuttgartGermany
  2. 2.Computer Graphics Laboratory, Computer Science DepartmentETH ZurichZurichSwitzerland

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