&translate z_trigger = 0.05, z_lower = 0.02, z_upper = 0.055 &endThis specifies that when the first particle passes
The boundary conditions are changed to Neumann on the upper, right, and left boundaries and Dirichlet on the lower boundary.
&translate z_lower = <zMin>, z_upper = <zMax>, z_trigger = <z0>, &endwhere
<zMin>
and <zMax>
are the minimum and maximum longitudinal
coordinates for the original problem mesh, and <z0>
is <zMax>
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