Good time of the day!I would like to compare two hulls of similar size but significantly different forms (including different WL areas/KM), and evaluate how forms (only) affects its motions/RAOs. For that I would like to exclude or minimize the effect of loading on motion. So far as loading is out of consideration, I can select VCG arbitrarily (within stability range of course). So if I select equal VCGs (or equal GMTs better?) for both hulls, then results of analysis gives me RAOs, which have changed only due to form and not because of loading. Is this correct? Or are there another method?Thank you!
Hi Ras,
What product are you working with?
Is this a 3d diffraction analysis or are you using strip theory? If this is 3d diffraction I would also try to keep the total number of panels similar. You will not be able to have equal number of panels but be close.
I do not know much about your project. I am answering the question as asked with the limited information provided. Yes, the differences would be due to the hull forms.
Georgina Maldonado
Hi Georgina
Thank you for your reply
I have started from strip theory, but probably will need to go for panel (for better accuracy)
Your point is well noted, thank you. I will try to keep number of panels as close as possible.
Sorry , but I would like to clarify:
In my cases I can fix (select equal) VCG, but then I have quite different GM. I can select equal GM, but then I have different VCG. For me fixing GM looks more correct ( we have equal arms), but I am not sure. What is your opinion?
Thank you again.
Dear Georgina
Any your advice on my problem? Or am I totally wrong on this?
Thanks and regards
Happy New Year!
I agree with the existence of the conundrum. I do not have an easy fix for it. Yes, GM is a function of the vessel geometry.
This is where a project would do parametric studies.
Georgina
Understood.
Thank you and regards
Ras