Data part, distributed force load on top

force_edge 0 0.0 -10.0
force_edge_geometry 0 -upper_edge_load
force_edge_time 0 3.0 0.0 4.0 1.0 1.e8 1.0

The force_edge 0 records specifies a distributed edge force of $-10.0 \frac{k N}{m^2}$ in y-direction (so in fact in negative y-direction). This force will be applied to the element edges which are part of the -upper_edge_load as specified in force_edge_geometry 0. Since this force is only applied in the experiment after time $3.0$, we need the force_edge_time 0 data records which contains a time versus multiplication factor diagram. Using this force_edge_time diagram, before time $3.0$ the load is $0.0$, between time $3.0$ and time $4.0$ the load increases from $0.0$ to $-10.0 \frac{k N}{m}$, and it remains $-10.0 \frac{k N}{m}$ after time $4.0$.