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Old   September 20, 2008, 10:22
Default waves caused by stones
  #1
gamego
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Hi,

Sorry that this question is not really about CFD, but should be a more genernal Fluid Mechniques problem.

We always can find regular curved waves before stones in small streams. It looks like shockwave in gas. It is different with the bow wave before a bridge pillar. Does anyone konw what's the formal name of this kind of regular wave pattern? Where (in which book or paper) can I find the physical model that explains this phenomenon?

Thanks,

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Old   September 20, 2008, 10:28
Default Re: waves caused by stones
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jinwon park
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How about the shallow water approach? It seems like hyperbolic equations. I recommend the books of E.F. Toro.
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Old   September 20, 2008, 10:32
Default Re: waves caused by stones
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gamego
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Thanks for reply.

But I think shallow water models cant explain these. Since the wavelength looks quite small. It looks like capillary waves. But I can find any analytical models dedicated to explaining them.

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Old   September 20, 2008, 10:35
Default Re: waves caused by stones
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gamego
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Here is an example image:

http://www-evasion.imag.fr/Membres/F...oks/baton4.jpg

And this one:

http://www-evasion.imag.fr/Membres/F...oks/capil2.jpg

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Old   September 22, 2008, 04:30
Default Re: waves caused by stones
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Tom
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I think what you are talking about are lee-waves (topographically forced waves) - basically gravity waves forced by the change in the shape of the lower boundary. The same effect occurs in the atmosphere behind mountains. If the stream is moving at close to resonance then these waves will behave like the bow wave.
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Old   October 1, 2008, 10:33
Default Re: waves caused by stones
  #6
Stefano
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if you want to simulate it it's very easy with FLOW-3D. You can simulate one or more stones (with their 6dof rigid mechanics) that falls into the stream, and then looking at the pressure/velocity field that is generated! Very easy simulation!
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