[mapleleaf]

Hello everyone
I want to use AWA method to research wave-induced scour，it will reduce the longth of normal NWT.
But when i simulate cnoidal wave，i find the trough is not correct. So i want to ask if there are some additional parameters to be set or there are some mistakes in my contral. I hopo you give me some suggestions.
I have attach my control，ctrl files，simulation result. The version which i use is REEF3D-23.11 and DIVEMesh-23.11.
control file
C 11 6
C 12 3
C 13 3
C 14 7
C 15 21
C 16 3
B 1 0.02
B 10 0.0 4.4 0.0 0.02 0.0 0.8
M 20 2
M 10 24

ctrl file
B 10 1
B 50 0.0001
B 90 1
B 92 6
B 91 0.1 8.8
B 98 4
B 99 3

D 10 4
D 20 2
D 30 1

F 30 3
F 40 3
F 42 0.8
F 60 0.40

I 12 1

N 40 3
N 41 60.0
N 47 0.20

M 10 24

W 22 -9.81

P 10 1
P 30 0.1
P 52 0.01
P 53 1
P 55 1.00
P 50 0.2 0.01
P 51 0.2 0.01

P 50 0.7 0.01
P 51 0.7 0.01

P 50 1.2 0.01
P 51 1.2 0.01

P 50 1.7 0.01
P 51 1.7 0.01

P 50 2.2 0.01
P 51 2.2 0.01

P 50 2.7 0.01
P 51 2.7 0.01

P 50 3.2 0.01
P 51 3.2 0.01

P 50 3.7 0.01
P 51 3.7 0.01

P 50 4.2 0.01
P 51 4.2 0.01

P 61 0.7 0.01 0.01
P 61 1.2 0.01 0.01
P 61 1.7 0.01 0.01
P 61 2.2 0.01 0.01
P 61 2.7 0.01 0.01
P 61 3.2 0.01 0.01
P 61 3.7 0.01 0.01

[Felix_Sp]

Hey,

AWA might not always be the best option for wave absorption. The velocity profile of your Cnodial wave is inherently different from shallow water wave theory You might try B99 4 or 5, yet I think for accurate wave absorption most of the time the relaxation zones work best.

So I would suggest you try B 98 4 + B 99 2 together with a relaxation zone of 8.8 m? (B 96 0.0 8.8). You might find sufficient accuracy for shorter relaxation zones, but I guess that is sth. you have to test for yourself.

Maybe somebody else has a better solution.

Kind regards
Felix

[valgrinda]

AWA works actually quite fine for these types of conditions (long waves in not too deep water). We have done this successfully many times (see Nadeem's paper: https://www.reef3d.com/wp-content/up...de_by_side.pdf)

I would choose another wave theory though, just go with B 92 8 (in case these are the correct conditions for cnoidal waves).