Wave Attenuation in Flume

lhanley222 · January 2023

Hi There,

I'm running an experiment studying wave attenuation through oyster growing cages. Part of the study is using a SPH simulation to look at wave attenuation. I've created a "flume" similar to the examples. Immediately, what I'm seeing is too much wave attenuation. I investigated further, and am seeing that even in an empty flume, I have wave heights decreasing across the domain. I'm unsure of the cause of this. I have a sloped beach at the end of my domain, but I'm not seeing major distortion from reflection. I've attached a paraview snapshot of my domain below.

I'm running at a dpi of .02m, and using a piston wavemaker with irregular waves. I'm quantifying attenuation using a wave spectrum at the first and last gauges, and seeing about 70% of wave energy dissipated in an empty flume. I'm using the MDBC. Does anyone have any suggestions?

TLDR; I expect to see little to no change in waves across flume, but am seeing waves decrease in energy.

lhanley222 · January 2023

I realize my issue is the same at the one described here:

https://forums.dual.sphysics.org/discussion/2248/waveheight-attenuation-phenomenon

So i will follow these suggestions and see if there is improvement.

Asalih3d · January 2023

Awesome!

Let us know, then we can help hopefully

I think AWAS would do wonders here. Some wave attenuation is properly to be expected still.

Kind regards

lhanley222 · January 2023

Thank you!

https://forums.dual.sphysics.org/discussion/comment/5640#Comment_5640

Right now I have implemented all suggestions but AWAS and am seeing about 90% attenuation. This is much better than before. I'm now running one with AWAS and will see those results in the morning

Alex · January 2023

Let us start with a reminder: SPH method is not designed to study wave propagation or wave attenuation, it is a method to study wave-structure interaction.

IN addition, we can propagate waves... yes... but standard SPH formulation can only propagate waves without wave decay for 2-3 wavelenghts maximum... using more sophisticated formulations such as delta-SPH can allow you to propagate waves better and longer.... and of course, other approaches as using Riemann Solver implementations can avoid this problem.

In the case of DualSPHysics using a proper viscosity treatment with DDT Fourtakas can help to propage waves perfectly for more than 3 wavelenghts

Regards

GWAVE · February 2023

I can confirm that the suggestions posted in the thread below do in fact work. I'm running waves in a flume about 45m long and see very little attenuation. I don't use mDBC or AWAS in my simulation. In addition, be sure your particle spacing is about 1/10 the wave amplitude.

https://forums.dual.sphysics.org/discussion/comment/5638#Comment_5638

Alex · March 2023

In addition, using coefh=1.2 or higher will also help to propagate waves for 3 wavelengths at least

Regards

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Wave Attenuation in Flume

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