Hi,
Just finished a model cosisting of aprox 1300 panels. Two days ago. Since then i'm trying, without success, to mesh it properly.
I tried all types of messhes, coons, delunay, delunay + kang, used kinematic constraints, used iterative, squares fe, triangular fe, tried to autocorrect the model, set a less restrictive model tollerance. I'm currently out of options with one week of modeling without the posibility to run the model.
I constantly get incoherent mesh on edges, whatever I do.
I need to specify, that fearing I would end up like this I've drawn the model entirely in Robot, rather than importing it / anything. I knew that importing would increase the risc of this, as it happened before.
So, 2 questions. What could I do to mesh it properly and run it.
Secondly, is there a "recipe" of modeling and/or meshing in a way that everything works fine from the first time (not meshing, remeshin, regenerating computational model, corecticting drawing model etc.) Or maybe some tips, or to-do's or to-don'ts, anything ?
Thank you.
Solved! Go to Solution.
Solved by Rafal.Gaweda. Go to Solution.
When the model is huge and very " confusing" I use to create nodes for the panel contour points and then , mark "snap to nodes" only. I never mark all snap options at the same time. I add each snap option one at a time as I need it.
Also , at some crowdy points(many bars ,panels arriving at a point) , always check the coordinates( I use 4 decimals or more) at the botton status bar.
If you are copying or moving panels,bars ,etc, always check the displacement vector. Beware of -0.0000 or 5,0001 values . If you´re getting this values , probably ,you´re snapping to the wrong point. Increase the zoom and only click to the point if you know it´s right.
Rafael Medeiros
Robot Structural Analysis
Are you playing in the contest how precise FEM model can be made ? 🙂
First of all you need at least 40mm mesh, not 200mm.
So you should get more than 200000FEs generated
We will so over night what will happen.
Lucky You 🙂
~100000 FEs only
with the settings below meshing works like a charm :
- no kinematic links
- meshing options as shown below:
after meshing add missing rigid links in such places:
Meshed model : http://we.tl/0isjEwXoo9
Many, many thanks! I very much appreciate your time and effort
Over 100k Thanks! 🙂
How did you determinte that 40mm is needed?
Again, many thanks!
Ok, so for future modeling of this type, mesh element size would be equal to the smallest side of panel.
Yes for the rigid links. I intended to add them after meshing, to be shure i get all points of the shells edges near each bar end node.
Thank you!
Ok, so for future modeling of this type, mesh element size would be equal to the smallest side of panel.
More less.
The smallest is half of I section flange, I guess , but correct FEs wil be generated there by forcing divisions on flanges by web panels.
I too am having difficulty with applying mesh to a trial model I am building in Robot (see attached screenshots). As you can see, for some bizzare reason, the mesh on one of my walls does not mesh in the plane of the wall but rather follows some bizzare arched pattern? I tried using the meshing options suggested above but some of the settings are greyed out and cannot be changed.?
Regards,
Anthony McTigue
FMG Engineering
Level 1/2 Domville Avenue,
Hawthorn, VIC 3122
Please disregard my previous post. I noticed I had not selected Delaunay properly. I deleted the troublesome wall and it is meshing properly now.
Regards,
Anthony McTigue
FMG Engineering
Level 1/2 Domville Avenue,
Hawthorn, VIC 3122