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Posted 11 years ago by zhengq
Hi,

For a transient modeling, can I make the seepage face transient (i.e., it is active for some time, but "switched off" for other time)?

Your help is greatly appreciated.

Quinn
Posted 11 years ago by Blair Thornburrow Groundwater Modeller
If you want the CONSTRAINT to be variably active, you can define the maximum (in) flow constraint value as a time series (0 m3/d when seepage face active, 100000 m3/d [for example] otherwise)

If you want the BC to be variably active, but always a seepage face when it is active, you can add a minimum (out) flow constraint and set at -100000 m3/d when active and 0 m3/d when inactive.  Hence, at times when you want no BC activity, it will have a maximum and minimum flow constraint of 0 m3/d.  At other times it will have a maximum flow constraint of 0 m3/d (no inflow) and minimum flow constraint of -100000 m3/d (unrestricted outflow).

Tip: select a very large constraint value when constraint inactive - otherwise the BC can behave in an undesirable manner due to a bug

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