Wave Flume tutorial
3 Attachment(s)
Hi everyone,
First of all, Niels, thank you very much for the tool and your effort in helping everyone to solve their problems. My problem is the following: I am using waveFlume tutorial to simulate waves propagating in a wave tank. I had to change the length of the tank and the depth so that it matches the required dimensions. I need to simulate a wave with a period of 0.913 seconds and a wave height of 0.033 metres. The depth of the wave tank is now 1 metre and the length is 17.965. The problem I experience is that the wave's amplitude decreases with the length of the tank (x-coordinate) and it is also out of the phase when I compare it to the analytical solution of the Stokes First Wave theory (this is what I am using). The following graphs demonstrate it (surface elevation at x=0, x=4, x=7.46 metres). Attachment 32423 Attachment 32424 Attachment 32425 I am also attaching my case files: https://www.dropbox.com/s/glv29onc0k2ehof/My_case.zip What I tried to do was refining the mesh significantly, but it made absolutely no difference. I also tried to use Stokes Second Wave Theory, but it gave exactly the same results. I also went through this thread and found a discussion of the similar problem to mine. It was posted by JanL (Jan Lohrmann), post #57, page 3. Quote:
I would really appreciate if someone would take a look at my problem or maybe someone has had it already? Thank you in advance! |
Good morning
@Dimitrij: When you are having less than 2 cells over the wave height, I am not surprised that you are having dissipation of wave energy. Kind regards, Niels |
Dissipation of the wave energy
1 Attachment(s)
Hi Niels,
Thank you very much for your quick reply to my post (post #822). I refined the mesh to get around 13 cells over the wavelength, but still I get the same results and the amplitude decreases with time. The graph from this simulation is shown below which compares the solution at 2 metres and 7.46 metres: Attachment 32469 I am also attaching my case files: https://www.dropbox.com/sh/6mhys9pci...iNmfXNaXho7yoa Could there be any other reasons why I am getting such results? What else can I try to resolve this problem? Thank you in advance, Dmitrijs |
Hi Dimitrij,
Try more points per wave length, 13 are way too little. If the problem continues, could you please try another version of OF. The VOF scheme was change from 2.2 to 2.3, so there might have been introduced some additional diffusion. Kind regards, Niels |
Hi Niels,
Thank you again for your replies! Can I just ask what would be the recommended number of points per both wave length and wave height to get reasonable results? Thanks, Dmitrijs |
Reflection control
Quote:
Thanks, Dmitrijs |
All times are GMT -4. The time now is 12:13. |