Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Internal error in boundary respecting
Posted Oct 28, 2009, 11:38 AM EDT Mesh Version 4.3a 8 Replies
the fuel is passed from the closed side.
The problem is while i am going to mesh it itz showing " error : Internal error in boundary respecting in subdomain 1 " plz guide me what is this error asap.
i am using comsol 3.4 version.
from my experience, such erros arrive when I have poorly defined my geometry, or imported it from programs that are not clean in the way they close the poly-lines defining superiour geometries, this often happens for dxf file format. I would recheck my geometry, and use the "repare" and or "defeaturing search", I suppose its already there in V3.4
I'm working on a geometry and I got such an error right now.
I did repair as you said, but it did not work. It gave me such an error:
"Failed to respect boundary element edge on geometry face."
one boundary couldn't be meshed with the remaining geometry.
Why that can be happening?
probably you have very small/short lines, or small sharp faces that implies very small mesh elements, or the repair did not work properly
how I created the geometry:
after creating two cylinders and one sphere, I intersected one cylinder one sphere with keeping input objects, so I created middle domains that are created by the intersection. Then I used delete entities to delete the remaining parts of the cylinder.
The result is one sphere with two caps at opposite ends.
my experience is that you should then identify where the mesh issue is and adapt the mesh manually to start to make some local entities with a finer mesh and leave the global "normal" mesh to avoid that you increase the mesh density everywhere.
But mesh density is your discretisation, so once you have solved, you shoul always check the gradients of your solutions, do you have several elements across anny steep gradient ? if not here you shoul densify locally your mesh
I am trying to mesh the geometry as shown in the attachment. It has a thickness of about 0.05inches.
I tried to mesh using most of the mesh options available in 4.3a version, but still the error persists.
May I please know how to work on the problem?
I would have used a free triangular mesh on the arc then swept through the rest of the domain with a distribution and finally used a converted to change the squares created by the swept mesh into triangles.
Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.
- FORUM 3D Mashing, "Internal error in boundary respecting"
- BLOG Understanding the Different Elements of Gear Modeling
- KNOWLEDGE BASE Internal evaluation error: unexpected NaN encountered
- BLOG Plotting the Algebraic Residual to Study Model Convergence
- BLOG Analyze Thin Structures Using Up and Down Operators