I was not able to find a command to fix the saturation to for example 0.8 above the ground water level. In FLAC2d there was a command to fix the saturation but in 3D it is only available for pore pressure. Is there any way to fix the saturation during the analysis?
In FLAC3D, there is no specific command to fix the saturation to a specific value above the groundwater level. However, you can control the saturation through the initialization process by setting it to 1 below the water level and to zero above.
Helpful Docs:
Verification of Concepts, and Modeling Techniques for Specific Applications
Initial Conditions
Properties and Units for Fluid-Flow Analysis
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