[akbrat]

Hi, I'm completely new to Reef3d, but I dare to ask this question since I tried some time now

I specify a wave height and a period, and the wave elevation I get is far too small (specify H=0.08 and get amplitude ca 0.011). But very nice and smooth. Have tried several grids, since I guess the issue lies there, but no luck.

control.txt
C 11 6
C 12 3
C 13 3
C 14 7
C 15 21
C 16 3

B 1 0.03
B 2 300 1 100
B 10 0.0 10. 0.0 0.05 0.0 2.0
B 103 5
b 113 1.05
B 116 1.5

M 10 6

ctrl.txt:
B 10 1
B 50 0.0001
B 90 1
B 92 4
B 93 0.08 1.0
B 96 4.0 8.0
B 98 2
B 99 2
D 10 4
D 20 2
D 30 1
F 30 3
F 40 3
F 42 1.0
F 60 1.5
I 12 1
N 40 3
N 41 40.0
N 47 0.25
M 10 6
P 10 1
P 21 1
P 30 0.05
P 51 5 0.025
W 22 -9.81

P 52 0.025
P 53 1
P 54 500

[kamath]

You have a 10 m long NWT in control.tct

You have a relaxation zone of 4 m from the start for wave generation.
You have a relaxation zone of 8 m from the end for wave absorption.

Therefore you have no working zone in your wave tank and no waves.

Increase x max to say 40, then you have about 28 m of working zone (40-4-8= 28), between x= 4 and x= 32.

You also try to use grid stretching in z, but without stretching. I would recommend that you start off with regular grids (take away B 2, B 101/2/3) and work with B 1 0.05/0.025/0.01 to start with.
Then you will get a feel for the grid res and NWT quality. Acc. Bihs et al (2016) 80 cells per wavelength in x-direction is sufficient.

[akbrat]

Thank you so much! Appreciate you took the time