Question about local mesh refinement

[Adil Memet]

Dear All,
I have a question about local mesh refinment, I have a mesh data file as STL format, after importing it and remesh it (generated by House coded software, due non-closed loops in the mesh element it shows some error , to run a simulation, Abaqus give me some warning as well as error message (Intersection mesh problem. after which, I locally refined it by selecting some specific mesh it biased seed . at the end, I still face similar problem. has anybody has been experienced similar problem ? Thank in advance.

 

[FEA way]

It's hard to say based only on those pictures (it would be best if you could share the file) but there indeed seems to be some non-manifold or otherwise broken mesh region. In fact, STL format is problematic in FEA. However, Abaqus offers some tools to handle such geometries. Check the article "Meshing Complex Geometries in Abaqus" on the Simuleon blog and consider using tools like the 3D Mesh to Geometry plug-in and Virtual Topology to get rid of the initial surface mesh defining the geometry and generate proper solid mesh for analysis.

 

[Adil Memet]

Thank you very much for your info and there is files you asked for. Please have a look. Thanks.

 

[Adil Memet]

After fixing mesh error or warning problem.there is some information during Job Running . some elements in the boundary has not completly meshed.

 

[FEA way]

You have to create a solid (or shell but it's unlikely to be the case here) mesh if you haven't done it yet. What you import to Abaqus is just geometry. Represented using surface mesh but not finite elements.

 

[Adil Memet]

Thank you very much for your quick reply, indeed, I did import STL-Import ---> Generate geometry from mesh then remesh it, how to create Solid mesh then ?

 

[FEA way]

If your geometry is still just a surface, use Shape --> Solid --> From Shell. Then, if needed, use Virtual Topology to remove redundant faces. Finally, go to the Mesh module and generate a solid tetrahedral mesh for this part.

 

[Adil Memet]

Thank you very much for your tips, I will try as you said

 

[Adil Memet]

Hello again
I tried the method you mentioned, at the end, I got this message, looks like this one also not working as I expected. what I can do the next step ?

 

[FEA way]

First repair that invalid region highlighted in the beginning. Geometry Edit —> Face —> Remove and Cover edges tools are sufficient for that. Then the previously described procedure should work.

 

[Adil Memet]

Hello,
Thank you very much for your tips regarding to remove process, in some cases, I just have one single point problem like the one shown in the below, how to remove that one single point or line elements from the converted geometry. Thanks in Advance.

in the case of line mesh problem. how to remove it ?

 

[FEA way]

Those highlighted points and edges likely belong to some incorrect surface elements so the solution described above may still be relevant. Try using the Geometry Edit tools to fix those regions (e.g. replace that narrow element in the top picture).