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 J.Kim April 20, 2006 17:48

swimming pool water surface motion due to wind

Problem: swimming pool water surface motion simulation

How to model swimming pool is filled with water and above the water surface, there will be a boundary layer type wind.

I'm considering 2D simulation. How can I define one surface with water and the other surface with air as the initial condition?

 Jack April 24, 2006 20:00

Re: swimming pool water surface motion due to wind

Use VOF and patch regions appropriately.

 J.Kim April 25, 2006 08:39

Re: swimming pool water surface motion due to wind

Thank you, Jack.

 Riaan May 5, 2006 01:02

Re: swimming pool water surface motion due to wind

Well, this is a classic Fluid Dynamics Problem - you can do an estimate using hand calculations. Refer to Fluid Dynamics by White.

The solution for the fluid direction vector as a function of depth ends up being a spiral (as seen from the top), if I remember correctly. So if you do a 2D simulation, this will be a shear driver flow only - which I suspect will not give the correct answer.

 J.Kim May 5, 2006 10:08

Re: swimming pool water surface motion due to wind

Thank you for your advice, Riaan.

When I posted my first question, I didn't know how to fill water in the swimming pool as an initial condition. That is, just nothing else than, to patch the area with water from the 'Initialize-patch' (my problem was 2-phase flow (liquid water as pahse 2 and air as phase 1).

My objective from the simplified, 2D simulation was what is the minimum wind speed separating water bubbles from the water surface.

The main purpose was what will be the wind speed that separates water from a surface. The water was falling along the surface and it will be detached from the surface when wind speed increases.

Full, 3D simulation of the problem was so complicated and was not converged when I employed VOF model. We compromised and simplified the problem and got an engineering solution. We will probably pubulish the results in a conference at first and then a journal paper. This problem can not be solved in a wind tunnel test. Only CFD is the solution.

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