button.To open the postprocessor window, select "Postprocessor" from the "Show" menu.
When the postprocessor window first appears, it displays the initial pressure head. Each active cell is colored according to the color scale on the right. You may change the display to moisture content, saturation, concentration, velocity or flux magnitude by selecting with the drop-down list box. Each display has its own color scale.
To start the simulation, click the button.
To stop the simulation, click the 
button.
For addition information on the postprocessor, see How to run a simulation.
If you view the simulated concentration, you can see that solute plume initially moves straight downward. When the plume comes in contact with the silt layer, it moves into the silt layer, even though the saturated hydraulic conductivity of the silt is about an order of magnitude lower than the saturated hydraulic conductivity of the sand! However, under unsaturated conditions and the prevailing negative pressure heads, the saturation in the silt is considerably higher than the saturation in the sand. (You can see this by displaying saturation.) Consequently, the silt layer represents a more permeable pathway, and the plume follows the silt layer and flows towards the right boundary. Eventually, the solute flows out of the system through side boundaries.
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