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September 30, 2021, 01:54 |
Output of force
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#1 |
New Member
Wenyu Zhao
Join Date: Apr 2021
Posts: 18
Rep Power: 5 |
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 |
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September 30, 2021, 02:43 |
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#2 |
Senior Member
Arun Kamath
Join Date: Nov 2014
Location: Trondheim, Norway
Posts: 265
Rep Power: 13 |
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.
__________________
Arun X years with REEF3D |
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October 1, 2021, 07:35 |
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#3 |
New Member
Wenyu Zhao
Join Date: Apr 2021
Posts: 18
Rep Power: 5 |
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January 22, 2024, 00:14 |
REEF3D_ 6DOF_ forces X 180
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#4 |
New Member
wengxinyu
Join Date: Jun 2022
Posts: 3
Rep Power: 4 |
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
Last edited by userweng; January 22, 2024 at 07:20. |
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January 22, 2024, 10:33 |
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#5 | |
New Member
Ahmet Soydan
Join Date: Jun 2015
Location: Trondheim, Norway
Posts: 25
Rep Power: 12 |
Please use the latest version of REEF3D. I also recommend using N 40 4 for floating body simulations.
Quote:
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January 23, 2024, 02:28 |
oscillation between Fz and Fx
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#6 |
New Member
wengxinyu
Join Date: Jun 2022
Posts: 3
Rep Power: 4 |
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?
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January 23, 2024, 05:20 |
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#7 |
New Member
Ahmet Soydan
Join Date: Jun 2015
Location: Trondheim, Norway
Posts: 25
Rep Power: 12 |
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.
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January 23, 2024, 07:39 |
This doesn't work
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#8 |
New Member
wengxinyu
Join Date: Jun 2022
Posts: 3
Rep Power: 4 |
This doesn't work, sir. This is my calculation file,can you check it?
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March 7, 2024, 21:52 |
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#9 | |
New Member
Yupeng Duan
Join Date: Aug 2022
Posts: 13
Rep Power: 4 |
Quote:
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. |
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