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With BL (fixed/float):
This selects tria/quad elements that define the surface area on which you need to generate boundary layers.

If a refinement box includes boundary shells selected via the With BL (float) selector and the remesh option is used, the surface elements are remeshed using the element size assigned to the refinement box.

W/o BL (fixed / float)
This selects tria/quad elements that define the boundary regions where a boundary layer is not desired.

The option W/o BL (fixed) can be used, for example, if two adjacent volumes are meshed sequentially and a matching interface has to be ensured. In that case the common interface elements have to be selected as W/o BL (fixed).
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