{"id":361324,"date":"2024-04-09T13:31:47","date_gmt":"2024-04-09T13:31:47","guid":{"rendered":"\/forum\/?post_type=topic&p=361324"},"modified":"2024-04-09T13:41:20","modified_gmt":"2024-04-09T13:41:20","slug":"railgun-simulation-bem-fail-to-converge","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/railgun-simulation-bem-fail-to-converge\/","title":{"rendered":"Railgun Simulation \u2013 BEM fail to converge"},"content":{"rendered":"

https:\/\/github.com\/Ice-Citron\/FEA-Physics_IA\/blob\/main\/First%20Runnable\/final_read%20-%202.k<\/p>\n

https:\/\/github.com\/Ice-Citron\/FEA-Physics_IA\/tree\/main\/First%20Runnable\/Second%20Runnable<\/p>\n

 <\/p>\n

I am trying to simulate a railgun of a particular topology and size for my college Physics Coursework. I am very new to LS-Dyna, but has managed to get used to LS-Dyna’s structure and everything, etc. I am using the railgun exemplar as my guide. <\/p>\n

On very above of this post, these 2 links are my GitHub repo which contains the 2 variants of keyword file I created, which are based on the railgun exemplar on LS-DYNA examples: https:\/\/lsdyna.ansys.com\/em-railgun\/#animated-result<\/p>\n

The issue that I am facing is this:<\/p>\n

<\/a><\/p>\n

I am using the exact same settings as the exemplar, as far as I am concerned. The only difference between my .k file and the exemplar is that I am using a different solid mesh for my railgun, as I will be using a different topology soon after. My mesh is created from .STEP file exported from fusion 360, which I then selected one of the faces, and then mesh it to 1.2mm with auto-mesher, and then used element generation to generate the rest of the component using shell offset to solid shell. <\/p>\n

I checked the contact of both files, as in penetration and contact edges. The exemplar itself seems to also have penetration + contact edges natively too, and its simulation works despite the initial penetrations. <\/a><\/p>\n

<\/a><\/p>\n

My version is the second one, and even when I try to remove the penetrations, etc. The same error output file is produced, which thus I in a way think penetration isn’t the issue here with FEM-BEM solver being unable to converge?<\/p>\n

I hope someone is willing to attempt to download my .k source files from my git repo, and then try and see if they can solve it, so that it runs like the one in the exemplar. <\/p>\n

 <\/p>\n

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