Turbulent water jet Note range of eddy scales and self- similar - - PowerPoint PPT Presentation

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Turbulent water jet Note range of eddy scales and self- similar - - PowerPoint PPT Presentation

Mar 09, 2023 400 likes •485 views

Turbulent water jet Note range of eddy scales and self- similar structure. Big whirls have little whirls, That feed on their velocity; And little whirls have lesser whirls, And so on to viscosity. - L. F. Richardsons prescient 1922

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SLIDE 1

Atm S 547 Lecture 2, Slide 1

Turbulent water jet

Note range of eddy scales and self- similar structure. “Big whirls have little whirls, That feed on their velocity; And little whirls have lesser whirls, And so on to viscosity.”

  • L. F. Richardson’s prescient 1922 book:

Weather Prediction by Numerical Process

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SLIDE 2

Atm S 547 Lecture 2, Slide 2

Lag-correlation and integral timescale for turbulence

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SLIDE 3

Skewness

Atm S 547 Lecture 2, Slide 3

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SLIDE 4

Atm S 547 Lecture 2, Slide 4

Schematic turbulent energy spectrum

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SLIDE 5

Atm S 547 Lecture 2, Slide 5

Time series/power spectrum of w in convection

Time series Power spectrum 600 s « 4.2 km

100 s

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SLIDE 6

Atm S 547 Lecture 2, Slide 6

2D 3D turbulence

velocity cascades to large scales vorticity to small scales

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SLIDE 7

Quasigeostrophic turbulence (2D-like ζ vortices, filaments)

Atm S 547 Lecture 2, Slide 7