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2.3 Experiments: data elaboration

Realizations = instantaneous images with measured concentration. Variance of the concentration, non-dimensionalised by the square of the maximum concentration. Mean concentration field (non-dimensionalised by the initial maximum concentration). 2.3 Experiments: data elaboration.

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2.3 Experiments: data elaboration

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  1. Realizations =instantaneous images with measured concentration Variance of the concentration, non-dimensionalised by the square of the maximum concentration Mean concentration field (non-dimensionalised by the initial maximum concentration) 2.3 Experiments: data elaboration Film (=55°, Fr=14.8) 6/ 19

  2. Cilindro investito da una corrente uniforme

  3. Vortici oscillanti a valle di un cilindro investito da una corrente uniforme

  4. Scia turbolenta a valle di un cilindro investito da una corrente uniforme Re=8000… … e Re=20000

  5. Scia turbolenta in una wind farm offshore

  6. Scia turbolenta in un’automobile … …e in una turbina

  7. BOTTOM DENSITY CURRENTS • In case of free surface discharge, a stratified flow develops. • Anyway the discharge is done, brine sinks toward the bottom and brine travels downslope, following bottom bathymetry, as a stratified flow. • In a stratified flow, dilution is achieved with three mechanisms: molecular diffusion (very slow), dispersion by external forces (such as currents or tides, not always guaranteed) and turbulent mixing. • Kelvin-Helmholtz billows COURSE B – SECTION 10 – SLIDE 09

  8. BOTTOM DENSITY CURRENTS • K-H billows develop when • In a stratified flow over the bottom of the sea, the thickness of layer mixed is • Mixing in negatively buoyant stratified flows happens if the velocity gradient is large (that is if the bottom is enough inclined) or nearto local bottom irregularities; after this mixing, there is another stratified flow, less dense, to be mixed. COURSE B – SECTION 10 – SLIDE 10

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