Visualization of turbulent flow with particles

  • Authors:
  • Andrea J. S. Hin;Frits H. Post

  • Affiliations:
  • Delft University of Technology, 2600 AJ Delft, The Netherlands;Delft University of Technology, 2600 AJ Delft, The Netherlands

  • Venue:
  • VIS '93 Proceedings of the 4th conference on Visualization '93
  • Year:
  • 1993

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Abstract

In this paper a new method for visualization of three-dimensional turbulent flow using particle motion animation is presented. The method is based on Reynolds decomposition of a turbulent flow field into a convective and a turbulent motion. At each step of particle path generation a stochastic perturbation is added, resulting in random-walk motions of particles. A physical relation is established between the perturbations and the eddy-diffusivity, which is calculated in a turbulent flow simulation. The flow data used is a mean velocity field, and an eddy-diffusivity field. The erratic particle motions are more than just a visual effect, but represent a real physical phenomenon. An implementation of the method is described, and an example of a turbulent channel flow is given, which clearly shows the random particle motions in their context of general fluid motion patterns.