[a7878455]

Hello REEF3D Team,

I am currently using CFD for harbor resonance-related analysis. I have created a tank with dimensions of 40 meters in the x-direction and 2 meters in the y-direction. On the right side, I have placed a structure with two openings to observe the water level changes when waves enter these openings. However, as I need to observe the phenomenon after waves enter the openings on the right side, I did not include other wave dissipation features, such as numerical beaches, on the right side of the tank.

However, with this setup, I have noticed that reflected waves significantly impact the subsequently generated waves. I would like to inquire about how to avoid the influence of reflected waves on the waves generated later.

Thank you in advance,
Cody

[valgrinda]

Hi Cody,

for harbor resonance, CFD may be a bit overkill. Already, your mesh is probably under-resolved and the reason for the wave dissipation. I would recommend using SFLOW for your case (harbor resonance = long waves, so it should do fine). It will be much faster and you can resolve it to the required level.

[a7878455]

Hello Bihs,

Thank you for your response and suggestions. I have started using SFLOW to analyze harbor resonance issues. Initially, I simulated an empty water tank to ensure that the generated waves align with theoretical expectations.

During the experiment, I encountered an issue. When I set the grid size to 0.05 and the length of the y-coordinate to 0.05, the SFLOW calculation results closely matched the theoretical results (please refer to the attached image y_0.5_wave_time). However, when I changed the y-coordinate to 2.0 while keeping other conditions constant, I observed a significant decrease in wave height in the SFLOW results. I would like to know how to address and correct this issue.

Attached are my executable files and the spatial and temporal output result images of the waves at y=2.0 (please see attached images y_2_wave_time and y_2_wave_space). I look forward to your further advice and guidance. Thank you very much.