The Route to Turbulence by Dwight Barkley

The Route to Turbulence by Dwight Barkley

International Centre for Theoretical Sciences via YouTube Direct link

Janssen-Grassberger

14 of 39

14 of 39

Janssen-Grassberger

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The Route to Turbulence by Dwight Barkley

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  1. 1 DATE: Thu, 20 February 2020, 14:30 to
  2. 2 The Route to Turbulence
  3. 3 Critical Reynolds numbers for onset of turbulence in a pipe
  4. 4 Observations by Reynolds 1883
  5. 5 Wall-Bounded Shear Flows
  6. 6 Finite-amplitude instability
  7. 7 Subcritical Transition Scenario
  8. 8 Subcritical Shear Flows
  9. 9 Intermittent Turbulence
  10. 10 Overview
  11. 11 Is turbulence in a pipe sustained at Re=1900
  12. 12 Statistical Phase Transitions
  13. 13 Tutorial on absorbing state transitionsDirected Percolation
  14. 14 Janssen-Grassberger
  15. 15 turbulence = disease
  16. 16 Wait a while
  17. 17 Turbulence Survival Lifetimes
  18. 18 Puffs can split Disease can spread
  19. 19 Splitting lifetimes
  20. 20 Laminar Flow and Turbulence
  21. 21 Generic behavior
  22. 22 Do any actual shear flows behave this way?
  23. 23 Can we do more?
  24. 24 Rc Turbulence fraction increases as R increases from Rc
  25. 25 Characteristic temporal scale: Characteristic spatial scale: $1
  26. 26 Critical scaling exponents
  27. 27 Puffs can split
  28. 28 Directed percolation phase transition to sustained turbulence in Collette flow
  29. 29 Universal continuous transition to turbulence in a planar shear flow
  30. 30 Why is there intermittenty?
  31. 31 Mechanism for localization Slug
  32. 32 Puff formation in long pipe
  33. 33 Puff and Slug
  34. 34 Excitable and Bistable
  35. 35 Transition scenario is captured by transition from Excitability to Bistability, together with fluctuations on the upper excited branch.
  36. 36 Brings tremendous clarity to transition in subcritical shear flows
  37. 37 This must be the "right way"
  38. 38 Intermittent vs Fully Turbulent
  39. 39 Q&A

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