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Modelling Wave breaking in STAR CCM+

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Old   February 12, 2020, 13:45
Default Modelling Wave breaking in STAR CCM+
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Hi,

I'm trying to model wave-breaking over a slope using STAR CCM+, using Cnoidal VoF waves.
My problem is that I'm not sure what water depth to specify for the waves. I initially tried to write a field function that calculated water depth throughout the tank as a function of x-position, but it seems to only accept a constant input. Should I set the water depth to the depth at which I expect it to break (or slightly deeper to prevent it breaking straight away, but whilst maintaining a shallow-water wave profile)? Am I correct in thinking that the way the wave 'feels' the bottom is through the no-slip condition set on that bottom? Should I be able to see the wave 'shoaling' as it gets shallower?

Thanks in advance,

Josh
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Old   February 18, 2020, 05:25
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You should specifiy the water depth where the wave are initialized. If you are using a velocity inlet, simply adjust the water depth value to this depth. The wave shoaling should happen automatically provided your spatial and temporal resolution is fine enouigh to capture these effects.
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Old   February 18, 2020, 11:34
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Thanks JB, does the mesh need to be fine only in the area where I expect the water surface to be? Or should I make sure it's fine along the bottom too so as to capture bottom effects? Or should it be equally fine all over? Your help is much appreciated.
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Old   February 18, 2020, 11:45
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Mesh refinements for wave is most important in region of the free surface (vertical and horizontal dimension). There are some recommendations like 80-100 cells per wavelength and 20 cells per wave height. If you want to model breaking waves you need a very fine mesh where the breaking accours. You can first do a check with a quasi 2D mesh (a 3d mesh with only one cell in thickness dimension) and see if everything works fine.
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Old   February 19, 2020, 04:58
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Ok, thanks!
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