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## Main Question or Discussion Point

Hello everyone,

The boundary condition :

P=0, z=ζ

is very common when studying irrotational flows. When cast with the Bernoulli equation, it gives rise to the famous dynamic boundary conditionn, which is much more convenient :

∂

But what happens if the motion is rotational ? What would be the analog of the dynamic BC ?

This condition is more complex than it seems ...

Thanks a lot !

The boundary condition :

P=0, z=ζ

is very common when studying irrotational flows. When cast with the Bernoulli equation, it gives rise to the famous dynamic boundary conditionn, which is much more convenient :

∂

_{t}φ+½(∇φ)^{2}+gζ=0, z=ζBut what happens if the motion is rotational ? What would be the analog of the dynamic BC ?

This condition is more complex than it seems ...

Thanks a lot !