Convergence error

[prasannahannur]

Dear STKO

I modeled a 2D masonry wall in STKO preprocessor by referring to one of your tutorials on youtube (link: https://www.youtube.com/watch?v=r0RyfCxfz80). But I am encountering a convergence error, I tried to change the algorithm and test command in the analysis but still not able to solve the issue. I am attaching my model along with the screenshot of the error that i am getting. Please help me fix the model. ( I am using STKO version 2.0.1 )

Thanking you.

[STKO Team]

Some of the faces have a normal vector pointing downward (-Z direction). In 2D analysis this is not allowed, as it leads to a negative Jacobian (inverted area).

Use the Reverse command to make sure all faces have a coherent normal vector pointing along the positive Z directio [0,0,1]

rev.png (588.34 KiB) Viewed 3740 times

[prasannahannur]

Dear STKO

Thank you so much for your reply. I made the suggested changes, I changed the coherent normal vectors of all faces to [0,0,1] but the convergence issue is still there.

[marafini.f]

Dear prasannahannur,

I tried with the suggestion on my computer and the your model runs further than before.
Tryout my file here:

masonry2.zip

(513.43 KiB) Downloaded 215 times

Maybe you moved the model after you applied the change in the orientation, or did not select the faces after clicking ok on the reverse command editor. Try again following the instructions in the terminal.

Francesca

[prasannahannur]

Thank you so much. The model is now working without any convergence error.

Regards
Prasanna

[marafini.f]

You are welcome, happy I could help!

[prasannahannur]

Dear Francesca

I tried to model a similar masonry infill wall with different aspect ratio and i am facing the same convergence issue as before. I tried to change the orientation with reverse command, i followed the instructions in the terminal to use reverse command but the error still persists. I am not sure whether i am using the reverse command correctly, i even referred to one of your tutorial videos for reverse command and followed the same steps. Can you please help me with this.
I am attaching my model below.

Thanking you
Prasanna Hannur

[STKO Team]

You correctly used the Reverse command, but you forgot to re-mesh after the reverse command. If you don't re-mesh it, the mesh element will have the old (wrong) orientation

[prasannahannur]

Thank you so much.