While drawing a closed flow boundary in PLAXIS 2D AE Water Conditions mode, a thick, black line should appear at these model boundaries:
Figure 1: Closed flow boundary on the left (thicker black line)
However, in PLAXIS 2D AE.00 this closed groundwater flow boundary condition will not be activated automatically right after drawing and so no thick black line will be shown. This means that it is also not active, and so not closed, for the calculation. For this closed flow boundary to be activated, it needs to be activated manually before it acts as a closed flow boundary during the calculation.
Also, when selecting this boundary condition, its setting will not become clear from the Selection explorer in Water Conditions mode.
This has been solved in PLAXIS 2D AE.01:
To activate this closed flow boundary in PLAXIS 2D AE.00, two options are available:
Another way to work around this, is to use the Model Conditions > GroundwaterFlow from the Model Explorer. If no line-specific flow boundary conditions are defined, these settings can close an entire model side for groundwater flow and consolidation, but be aware that no graphical indication is given that the boundaries are closed (e.g. no thick black lines).
Figure 4: Closed flow boundary conditions in Model Conditions