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I have a question about boundary conditions. I need to solve the wave equation with a rigid boundary at y=0 and a free boundary at y=h. I know this means that we have zero normal component of velocity at y=0. However, what does free boundary imply? Is it that the pressure is zero at y=h?

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  • $\begingroup$ The pressure can be taken as constant and there is also a kinematic condition as derived here. $\endgroup$ – RRL Jan 28 at 14:45

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