Output of force
 

Hello, I want to output the breaking wave force on the square structure under different rotation angles. I set the terrain with the command of 'o' and the structure with the command of's', but there is no force output in 'REEF3D_CFD_Forcesolid-1.dat'file, and many' nan 'characters appear. The following is my output file and the contents of the 'control. txt' file. Can you help me see what's wrong?
'REEF3D_CFD_Forcesolid-1.dat'file
x_start xend y_start y_end z_start z_end
43.3 44.7 . 1.8 3.2 . 2.3 7


it time Fx Fy Fz
2 0.00614574722 nan nan nan
3 0.00883904188 nan nan nan
4 0.0117192588 nan nan nan
5 0.0145134942 nan nan nan
6 0.0173044542 nan nan nan
7 0.0201809681 nan nan nan
8 0.0232861434 nan nan nan
9 0.02665776 nan nan nan
10 0.0300338007 nan nan nan
11 0.0332941716 nan nan nan
12 0.0363535086 nan nan nan
13 0.0391774851 nan nan nan

'control. txt' file
C 11 6
C 12 21
C 13 21
C 14 8
C 15 21
C 16 3

B 1 0.05
B 10 0.0 54.0 0.0 5 0.0 7.0

S 10 43.65 44.35 2.15 2.85 2.3 7
S 5 44 2.5 2.3 0 0 27

O 61 21.0 44.0 0.0 5.0 0.0 2.30
O 10 44.0 54.0 0.0 5.0 0.0 2.30

M 20 2

M 10 12

The O commands are now deprecated. Please use the S commands for your object.
Also in your ctrl.txt file, use the P 81 command to define a box around your structure to generate values for forces.

ok, thank you very much! The problem has been solved.

REEF3D_ 6DOF_ forces X 180
 

Hello, I am using the X 180 floating body ；In REEF3D_ 6DOF_ forces file, after each time step, the magnitude of the force change is too large, which is not consistent with the actual test results. When I use a scatter plot to view Fz data, the image presents three smooth curves.Can you help me solve this problem？This is my calculation file

Please use the latest version of REEF3D. I also recommend using N 40 4 for floating body simulations.

oscillation between Fz and Fx
 

Thank you, I have updated to the latest version of REEF3D and DiveMESH， and used N 40 4 for simulation, but there is still some oscillation between Fz and Fx. Is this normal?

I'm not sure if this result is from the case you shared but if so, the Bcs on the side walls must be a symmetry plane because this is a 2D simulation.

This doesn't work
 

This doesn't work, sir. This is my calculation file，can you check it?

Hi
according to the user guid manuel, it seems that the user can only define a "force box" to out put the force , how can I out put the force for the side-by-side fixed boxs separately.