06 vorticity eqn - atmdyn.orgatmdyn.org/teaching/intro_dyn2/06_vorticity_eqn.pdf · Vorticity...
Transcript of 06 vorticity eqn - atmdyn.orgatmdyn.org/teaching/intro_dyn2/06_vorticity_eqn.pdf · Vorticity...
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1. Vorticity equation in z-coords
2. Physical meaning
3. Examples
Vorticity equations
From Wikipedia
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Governing equations
Primitive equations in z-coords
ut + uux + vuy + wuz − fv = −1ρ
px
vt + uvx + vvy + wvz + fu = −1ρ
py
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Governing equations
Primitive equations in z-coords
Vorticity equation (in z-coords)
ut + uux + vuy + wuz − fv = −1ρ
px
vt + uvx + vvy + wvz + fu = −1ρ
py
DDt (ζ + f) = − (ζ + f) ( ∂u∂x + ∂v∂y )
−( ∂w∂x ∂v∂z − ∂w∂y ∂u∂z )+
1ρ2 ( ∂ρ∂x ∂p∂y − ∂ρ∂y ∂p∂x )
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Stretching termDDt (ζ + f) = − (ζ + f) ( ∂u∂x + ∂v∂y )
u
v
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Tilting term
xy
z
DDt (ζ + f) = − ( ∂w∂x ∂v∂z − ∂w∂y ∂u∂z )
u
u
w
w
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Solenoidal termDDt (ζ + f) =
1ρ2 ( ∂ρ∂x ∂p∂y − ∂ρ∂y ∂p∂x )
1010 hPa
1000 hPa
990 hPa
ρ
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Governing equations
Primitive equations in z-coords
Vorticity equation (in z-coords) (where, and )
ut + uux + vuy + wuz − fv = −1ρ
px
vt + uvx + vvy + wvz + fu = −1ρ
py
∇ = ∇2 ⃗u = iu + jvDDt (ζ + f) = − (ζ + f)∇ ⋅ ⃗u − ∇w ×
∂ ⃗u∂z
+1ρ2
∇ρ × ∇p
StretchingTerm
TiltingTerm
SolenoidalTerm
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Example (stretching)
Youtube NSF Fluid Mechanics Series (9.Vorticity 2/2 11분30초)
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Example (tilting)
From Holton, originally from Klemp (1987)
Youtube: Vorticity 4K (Mike Olbinski) (Wind shear 0:59, Rotation 4:21, Tornado: 5:07)
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Example (tilting)
Youtube NSF Fluid Mechanics Series (9.Vorticity 2/2 14:15)
곡류천의 예 (https://educalingo.com/)
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Example (solenoid)
From Essentials of Meteorology (Ahrens)
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Example (solenoid)
From Holton