[Intro]
[Instrumental, Electric Piano, Flute]
[Break]
Rock a bye baby, on the tree top,
When the wind blows the cradle will rock.
When the bough breaks the cradle will fall,
And down will come baby, cradle and all.
[Break]
[Verse 1]
Boundary layer feeling the friction
Forcing change on wind direction
Try to calm my turbulence
Stabilize my performance
[Chorus]
It’s a fluid situation
Dynamic separation
Vortex Shedding
Whirlwind shredding
[Bridge]
Fluctuations in navigation
Swirling, whirling
Fluctuations in direction
Swirling, whirling
Turbulence and oscillations
[Break]
Do you recall:
Down will come baby, cradle and all
]Instrumental]
[Verse 2]
Pressure gradient creation
Increased speed, proceed
A fluid situation
Ahhh, the wind is freed
[Chorus]
It’s a fluid situation
Dynamic separation
Vortex Shedding
Whirlwind shredding
[Bridge]
Fluctuations in navigation
Swirling, whirling
Fluctuations in direction
Swirling, whirling
Turbulence and oscillations
[Break]
Do you recall:
Down will come baby, cradle and all
[Instrumental]
[Bridge]
Passing through the canopy (wake flow)
Passing through the canopy (winds blow)
Fluctuations in situation
Swirling, whirling
Fluctuations in connection
Swirling, whirling
Turbulence and oscillations
[Break]
Do you recall:
Down will come baby, cradle and all
[Chorus]
It’s a fluid situation
Dynamic separation
Vortex Shedding
Whirlwind shredding
[Outro]
Passing through the canopy (wake flow)
Passing through the canopy (winds blow)
[End]
A SCIENCE LESSON
The physics of wind interacting with a tree involve several factors:
- Fluid Dynamics: Wind behaves as a fluid, and its flow around a tree is governed by principles of fluid dynamics. As wind encounters the tree, it splits into two streams: one flowing around the tree (boundary layer flow) and another passing through the canopy (wake flow).
- Boundary Layer: The layer of air in direct contact with the surface of the tree forms the boundary layer. This layer experiences friction with the tree’s surface, causing a decrease in wind speed and turbulence as the air moves closer to the trunk and branches.
- Pressure Gradients: Wind creates pressure gradients around the tree, with higher pressure on the windward side and lower pressure on the leeward side. This pressure difference causes air to accelerate around the tree, resulting in increased wind speed on the windward side and reduced speed on the leeward side.
- Vortex Shedding: As wind flows past the tree, it can create vortices or swirling air patterns, known as vortex shedding. These vortices can cause fluctuations in wind speed and direction, contributing to turbulence and oscillations in the airflow.
- Aerodynamic Effects: The shape and structure of the tree influence how wind interacts with it. Features such as branches, leaves, and irregularities in the tree’s surface affect airflow patterns, creating areas of turbulence, separation, and recirculation.
Understanding the physics of wind-tree interactions is essential for various applications, including forestry, urban planning, and wind energy. It helps predict wind loads on trees, assess windbreak effectiveness, and optimize the design of buildings and structures in windy environments.