Difference in boundary m vs. fm


I’m setting boundary m p p or boundary fm p p and I get slightly different results. I could not find, what fm or fs actually means in the doc. It is mentioned only in the examples.

So what is the difference between m and fm?

This is explained in the documentation. In the very first paragraph even:

Set the style of boundaries for the global simulation box in each dimension. A single letter assigns the same style to both the lower and upper face of the box. Two letters assigns the first style to the lower face and the second style to the upper face.

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Oh, my bad, thanks Axel