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Non-Darcian Flow Material Model for SEEP/W

Van Genuchten Non-Darcy Flow

This Add-In implements the Darcy-Forchheimer equation for modeling flow at large velocities, when both viscous and inertial effects are present. It is ideal for modeling water flow in coarse-grained soils.

Requires GeoStudio 2018 R2 or newer.

Install Add-In

Related Products

SEEP/W

Add-In Documentation

Technical overview (PDF)
Example file illustrating the use of this Add-In (GSZ)

How to Install and Use an Add-In

This Add-In provides the following functions:

Hydraulic Conductivity Functions

Van Genuchten Constrained Hydraulic Conductivity Function Non-Darcy

Field Name	Description	SI Units	U.S. Customary Units
Saturated Volumetric Water Content	Saturated volumetric water content (0-1)
Residual Volumetric Water Content	Residual volumetric water content (0-1)
Parameter alpha	A fitting parameter	/kPa	/psf
Parameter n	A fitting parameter, >1
Saturated Hydraulic Conductivity	Saturated hydraulic conductivity	m/sec	ft/sec
Parameter l	A lumped parameter accounting for both pore tortuosity and connectivity
Form Drag Constant	The form drag constant
Temperature	The fluid temperature	°C	°F

Volumetric Water Content Functions

Van Genuchten Constrained Water Content Function

Field Name	Description	SI Units	U.S. Customary Units
Soil Structure Compressibility	The soil structure compressibility	/kPa	/psf
Saturated Volumetric Water Content	Saturated volumetric water content (0-1)
Residual Volumetric Water Content	Residual volumetric water content (0-1)
Parameter alpha	A fitting parameter	/kPa	/psf
Parameter n	A fitting parameter, >1
Saturated Hydraulic Conductivity	Saturated hydraulic conductivity	m/sec	ft/sec
Parameter l	A lumped parameter accounting for both pore tortuosity and connectivity
Form Drag Constant	The form drag constant
Temperature	The fluid temperature	°C	°F

What Is an Add-In?

GeoStudio Add-Ins can be used in place of any internal GeoStudio function (such as those under the Define menu) or SIGMA/W material model.

Some Add-Ins are distributed ready-to-use on the geoslope.com web site or from third parties, but you can also write your own using the Add-In SDK.

Installing this Add-In

Click “Install Add-In” above to download a self-extracting zip file containing the Add-In. The Add-In will be installed in the Add-In folder. By default the Add-In folder is %APPDATA%\GEO-SLOPE\AddIn, but it can be changed in GeoStudio under Edit - Options.

To uninstall the Add-In, simply delete the .dll from the Add-In folder.

Using this Add-In

After installing the Add-In, its functions can be used under Define - Functions in GeoStudio:

From GeoStudio’s Define menu, choose a type of function that this Add-In extends.
Click the Add button to add a new function.
From the “Types” control, select “Add-In Function”.
Click the “Select” button, and select this Add-In from the list.
From the “Functions” control, select one of the functions provided by this Add-In.
Select each “Function Field Name” in turn and type a value.

Understanding Units with Add-Ins

To figure out what units to use when entering values, first determine if your file's Units of Computation are U.S. Customary or SI (see Define - Project Properties - Settings), then use the units indicated in the appropriate column.