Three instances of each cell

[mojtabaAmiraslanpour]

Hi,

I'm iterating through the cells using:

for (const auto &pair : lpc) { ... }

However, I noticed that each cell appears three times in the code with different cell IDs. For example, a single cell can have the following IDs:

-20000
0
20000

This occurs regardless of whether the code runs in serial or parallel. I need to handle interactions for specific cell types, but this duplication makes me wonder how best to manage multiple instances.

Any suggestions on how to approach this?

[mojtabaAmiraslanpour]

Ok, I just found out it is because of the periodic boundary condition I have in Z-direction.