User talk:Crowsnest

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Open water swell

As soon as I saw this edit I thought "Crowsnest will know!" Dolphin (t) 13:16, 15 September 2025 (UTC)[reply]

@Dolphin51 Hi Dolphin51,

yes, pressures and velocities are described with linear wave theory in Airy wave theory.

A nonlinear description is in Stokes wave

Kind regards, Crowsnest (talk) 18:59, 18 September 2025 (UTC)[reply]

Thank you! I have pasted this information in answer to the question on the Fluid dynamics project page. Dolphin (t) 01:56, 19 September 2025 (UTC)[reply]

Motion of a scuba diver under a swell

Hi Crowsnest, Thanks for you response to my question about velocity and pressure distribution in waves. I spent several futile hours searching before I asked. What a I am really looking for is information on how a scuba diver will be affected by wave motion as depth varies, taking into account that the diver should be neutrally buoyant, but that the diver and equipment are compressible due to air spaces, so the condition is unstable. I know from personal experience that maintaining neutral buoyancy near the surface is difficult, and that waves make it worse, and that below about 3m depth it is much easier. Also easier if the air spaces are smaller. The motion of a small incompressible neutrally buoyant object will be similar to that of a packet of water, but if the object is of a similar order of size to wave height, it is not obvious how the variations in water pressure and velocity in the wave will affect motion of the diver, which though not rigid, is also not fluid. Are you aware of any studies/reports on this type of situation? My searches keep getting AI responses that are a mix of garbage and missing the point of the question. My technique is to be slightly negative and hang from a buoy, using my arm as a heave compensator. An interesting observation is that the depth on my decompression computers vary less than I would have expected, possibly due to lag in display updates. At present we have no information on Wikipedia about this, which I would like to change, but lack sources. Cheers, · · · Peter Southwood ^(talk): 10:11, 19 September 2025 (UTC)[reply]