# Wave Generation Problem in a Wave Flume

- I am trying to generate a 2nd order wave regular wave (H = 0.2 m, T = 0.95 sec) using a Piston.
- The depth of the flume is 1 m, flat-segment is 6 meters, and beach has 1/10 slope.

No matter what I change, the wave keeps "dying" ? (i.e., it does not propagate until the end of the flume. Is there a way to fix this).

Thanks!

## Comments

Check whether the damping zone is used.

regards.

Hi, did anyone help me with the same issue. I am getting the same wave behavior. I have not used damping zone.

Please let me know where I am going wrong. Thanks.

Checkout this paper "https://www.sciencedirect.com/science/article/abs/pii/S0378383921001666"

I guess wave-decay is inherent in standard SPH formulation. Correction needs to be done to Kernel Gradient, I am not sure if it has been implemented in DualSPHysics.

Thank you so much @sam95 for your reply and sharing the paper about kernel gradient!

Alright, so to tackle this wave decay issue, I'm going to make a couple of changes. First up, I'll reduce the distance between the piston and the coast (x), so that the wave doesn't have to travel as far and lose energy along the way. And secondly, I'll increase the wavelength (L) by cranking up the wave period. Hopefully, with these adjustments, I'll be able to get a better-looking wave that'll propagate throughout the flume. Let me know if I am correct.

Also. could you please tell me which parameters apart from propagation distance (x) and wave period, what other settings worked for you? I am currently using above values.

Thanks.

Thank you so much @sam95 for explanation. I will proceed accordingly.

Thanks!

Using alpha=0.01, 10 particles per wave height and coefh=1.2 or higher will allow propagating waves for 3 wavelengths without problems

Regards