How does a free surface flow cause non-linearity?

[binbagsss]

TL;DR

Free surface flow , non linearity

How does a free surface flow cause non-linearity , is it through the boundary conditions ? Which one and how ? Thanks

 

[berkeman]

Links?

 

[Baluncore]

How does a free surface flow cause non-linearity , is it through the boundary conditions ...

Boundary layer flow velocity is greater for thicker films. A surface wave catches up with, and collects more fluid from thinner films, until it builds into a breaking wave, that rushes across the wet surface.

 

[binbagsss]

Boundary layer flow velocity is greater for thicker films. A surface wave catches up with, and collects more fluid from thinner films, until it builds into a breaking wave, that rushes across the wet surface.

in terms of the equations sorry, not physically, thanks

 

[Baluncore]

in terms of the equations sorry, not physically, thanks

Which situation and which equations.

I refer you to chapters 2 and 3 of;
Title: Free-surface flow: shallow-water dynamics
Author(s): Katopodes, Nikolaos D.
Publisher: Elsevier Science & Technology, Year: 2019