1. Introduction 2. Forcings 3. Observations 4. Atmospheric Turbulence 5. Ocean Turbulence 6. Dimensional Analysis 7. Basic Equations 8. Length Scales
Jan 04, 2016
1. Introduction2. Forcings3. Observations4. Atmospheric Turbulence5. Ocean Turbulence6. Dimensional Analysis7. Basic Equations 8. Length Scales
Convective flows, Rayleigh-Nuselt numbers
Important parameters to consider in unstableflows Rayleigh Taylor Instab.
• The Atwood Number, A
• The width of the mixing zone,
• The non-dimensional time,
• The Fractal Dimension
21
21
²cgAt2
tH/Ag
/logNlog
D
N D
1
1
Boussinesq Aproximation consiss
On neglegting inertial accelerations on
density fluctuations, but allowing the
Gravitational accelerations.
Baroclinic Vorticity
Shocks in AIR of He and Kr Balls, Which is Which ?
0 500 1000 1500
0
5
10
15
20
25
ODCi
tir #260 tir #262 tir #265point 1 point 2 point 3 point 4
x [c
m]
t [µs]
x3x4
x2
x1 krypton M=1, 2
0 500 1000 1500 20000
100
200
300
UODC
i
= 370 m/s Uec
= 45 m/s
U [m
/s]
t [µs]
tir #296 tir #257 tir #254point 1 point 2 point 3 point 4
x4 x1x2x3hélium
M=1,05
0 5 100
1
2
M = 1,05 < 5% M = 1,2 < 5% M = 1,5 < 5% M = 1,7 < 5%
L aval/R
0
t/t0
a)b)c)d)
VelocityMagnitude
Volumeof Fluid
VorticityMagnitude
0÷10÷0,33 -106÷84
min
max
Basic Turbulence
Basic Turbulence
Basic Turbulence
Basic Turbulence
• Stratification causes strong vertical anisotropy!• Redondo(1990)