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Area of Science:

  • Fluid dynamics
  • Turbulence research
  • Polymer physics

Background:

  • Understanding tracer particle behavior in turbulent flows is crucial for various scientific fields.
  • Noninteracting tracers typically follow flow streamlines but do not exhibit preferential sampling.
  • The influence of particle elasticity on its interaction with turbulent eddies remains an area of active investigation.

Purpose of the Study:

  • To investigate the behavior of an elastically interacting chain of tracers in a turbulent flow.
  • To compare the dynamics of interacting elastic tracers with noninteracting tracers.
  • To quantify the preferential sampling and its dependence on chain elasticity and deformability.

Main Methods:

  • Simulating a string of tracers with elastic interactions in a turbulent flow field.
  • Analyzing tracer trajectories and spatial distribution within the flow.
  • Utilizing the Okubo-Weiss parameter to quantify preferential sampling and vortical region trapping.
  • Examining the effect of varying the number of links (deformability) in the elastic chain.

Main Results:

  • Elastically interacting tracer chains demonstrate significantly different behavior compared to noninteracting tracers.
  • Elastic chains exhibit strong preferential sampling, becoming trapped in vortical regions of the turbulent flow.
  • The degree of preferential sampling is directly related to the elasticity of the chain.
  • Modifying the chain's deformability by altering the number of links impacts its interaction with turbulence.

Conclusions:

  • Elastic interactions fundamentally alter tracer dynamics in turbulent flows, leading to preferential sampling.
  • Vortical regions act as attractors for elastic tracer chains.
  • The elasticity and deformability of the tracer chain are key parameters governing its interaction with turbulent structures.