DESCRIPTION
-1 Upper level menu # boundary 1 is an entry of a spatially periodic flow This boundary is the entry of the spatially periodic flow and thus can not selected as the outlet 2 boundary 2 is non-penetrable This boundary is currently non-penetrable, but could be select as the outlet of the spatially periodic flow 3 boundary 3 is non-penetrable This boundary is currently non-penetrable, but could be select as the outlet of the spatially periodic flow