Thermal Wave

• Any fluid flowing across a boundary bounces.
• Shear can be speed, direction, or density … or all
• Thermals begin in an “unstable” layer and cross the boundary atop it.
• Thermals penetrating the shear boundary are an obstacle to laminar flow and
• Amplify the bounce within the stable layer above
• (If the layer above isn't stable, we get Cu-nim instead of thermal wave)
• If streeting occurs in the boundary layer,
• Shear wave may align the streets or
• Cross the streets (creating a checkerboard of cu, pretty rare)