Currently, I'm working on creating a hexagonal Single Point Mooring model in MOSES EDITOR. I need to form the compartment model inside the SPM.
Since the SPM has a hexagonal form, thus the compartment has to be a Triangular Prismatic as you can see in the attached figure below. I found it difficult to create the triangularly prismatic form if I use plane command.
Is there any alternative method that can be used for this work?
Thank you in advance.
Here's the example of my build up command:
&dimen -save -dimen Meters M-Tons&describe body COBAPRISMA&describe Body Tank001pgen -PERM -1 -PORT -LOC 0.00 0.00 0.00 -diftype NONE plane 0 -cart 0.00 0.00 3.474 0.00 3.474 5.641 plane 6.0040 -cart 0.00 0.00 0.000 0.00 0.000 5.641end pgen&describe Body Tank002 pgen -Perm -1 -LOC 0.00 -3.474 0.00 -diftype NONE PLANE 0 -cart 0.00 0.00 0.000 0.00 0.000 5.641 plane 6.004 -cart 0.00 0.00 3.474 0.00 3.474 5.641end_pgen
I attached a wedge.zip. This is a set of file that show how to make a wedge or triangle shape compartment. Please run spar.cif before running c_spar.cif.
Please review and let us know your questions.
Your code worked really well, thank you.
Yet, I do have another question,
While I am using the 'difference' command to make a hole inside of the body, why cannot I generate the hydrodynamics command in order to obtain the RAO? Is it because of the 'difference' command not generate the closed surface?
Thanks in advance.
Please add the line
&describe piece Pname -ditype 3ddif -cs_curr 1 1 1 -cs_wind 1 1 1
before the panel definitions. In the above command "pname" is the piece name.
Also the command "INMODEL" does not need the body name after it. The command is simply "INMODEL".
I hope this helps. Please let us know of other questions.
Dear Georgina, thanks for helping me!
However, if you don't mind, I would like to ask another question,
After the hydrodynamic analysis was generated (I was using 3ddifraction theory), why is it so difficult to find the equilibrium of single point mooring (calm buoy) for mooring analysis during the time domain simulation?
You give me very little to work with. Can you tell me more about your difficulties?
Have you included a mooring system? Is the equilibrium including a wave environment? What is the warning message?
I have attached the mooring lines to the buoy. However, the equilibrium positions were not found in 2 conditions: first, after the command &dcptime, second, after the environmental data were generated (after &env command). The warning message said that "the simulation terminated due to instability". Are these problems occurred because of the mooring arrangement or any something else?
I have attached my build-up command that might be evaluated by yourself.
ps: Please ignore the post-processing command, because I haven't fixed that yet.
The files you sent do not show the mooring system characteristics. I am sending back the command file with the commands to review the mooring system characteristics.
The mooring system defined put the anchors 330 m from the fairlead. This results in the mooring system lines not having a catenary shape. Most mooring are dependent on the force changing when the catenary shape changes.
The environment defined has a mean wave force of 72 mtons. The mooring system restoring force shows a very steep slope for the restoring force to counter 72 mtons. The steep slope is why you are having problems finding equilibrium.
Please review and let me know if you have further questions.