Floating Hull FEA Analysis
Floating Hull FEA Analysis
(OP)
Hi,
I am doing my first academic project using Abaqus. I am trying to model a floating box hull with water pressure acting from the bottom and the sides. I am trying to follow the paper attached here. I am having problem setting the boundary conditions even though I am setting it up as per the paper's instructions. I am trying to study the box hull deformation. I would then take it forward to an actual ship's hull.
Kindly advise as to how do I go ahead with this.
Thank you.
I am doing my first academic project using Abaqus. I am trying to model a floating box hull with water pressure acting from the bottom and the sides. I am trying to follow the paper attached here. I am having problem setting the boundary conditions even though I am setting it up as per the paper's instructions. I am trying to study the box hull deformation. I would then take it forward to an actual ship's hull.
Kindly advise as to how do I go ahead with this.
Thank you.





RE: Floating Hull FEA Analysis
What problems are you having? Convergence issues? If so, please write the error messages and maybe we can find out.
Best regards,
RE: Floating Hull FEA Analysis
Thanks.
RE: Floating Hull FEA Analysis
It is hard to tell what has been done exactly. There is no elastic-plastic material data in the paper. What material did you use? Does it cave in with purely elastic material properties? NLGEOM is on, right?
It seems like the author in the paper is using a riks step.
If you attach the input file, maybe I can take a look to see if I see anything strange.
Cheers!
RE: Floating Hull FEA Analysis
Kindly find attached the input file.
Thanks.
RE: Floating Hull FEA Analysis
RE: Floating Hull FEA Analysis
The paper you attached shows what it calls "Flange of stiffener" and "Side of stiffener" in figure 1 (I think).
I only have a preprocessorthatwedonottalkabout right now and I am a bit unfamiliar with how it displays loads. Are your loads applied on the "right side" of the shells?
Are you applying the bending as rotation (measuring the reaction moment)? I am not sure if that works. Link
Cheers!
RE: Floating Hull FEA Analysis
RE: Floating Hull FEA Analysis
Left node => Ux=Uy=Uz=URy=URz=0
Right node => Ux=Uy=URy=URz=0, where x=transverse axis, y= vertical axis, z=longitudinal axis, The box cross-section lying in the X-Y plane. It seems to be working now though I will have to calculate and verify the results as per theoretical formulas.
For the self-weight I took Gravity load and applied a vertically downward factor CFy= -9810 mm/sec2 (as all my length units are in mm).
If someone has any advise or notices any mistake, feedbacks are highly welcome. Will keep updating this post as the results come. Thanks.