[Andrea-wwwwwwww]

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

[kamath]

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.

[Andrea-wwwwwwww]

Originally Posted by kamath

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.

[userweng]

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

[soydana]

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

Originally Posted by userweng

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

[userweng]

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?

[soydana]

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.

Originally Posted by userweng

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?

[userweng]

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

[YupengDuan]

Originally Posted by kamath

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.

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.