RS2 Features

Finite Element Groundwater Seepage


RS2 includes steady-state, saturated-unsaturated finite element groundwater seepage analysis built right into the program. There is no need to use a separate groundwater program; the seepage analysis is fully integrated with the stress analysis in RS2. The pore pressures computed from the groundwater analysis are automatically used in the stress analysis to compute effective stress.

Other quantities are also calculated such as flow rate, hydraulic gradient and discharge velocity. The groundwater seepage analysis in RS2 can be used as a standalone groundwater program, independently of the stress analysis functionality.

See each of the topics below for more information:

Boundary Conditions
The following hydraulic boundary conditions are available in RS2:
  • Total Head (H)
  • Zero Pressure (P=0)
  • Nodal Flow Rate (Q)
  • Normal Infiltration (q)
  • Vertical Infiltration (q)
  • Unknown (P=0 or Q=0)
  • None / Remove BC
Hydraulic Conductivity (Permeability)
For a finite element groundwater analysis, you must define the hydraulic conductivity (permeability) for each material. You can define the saturated permeability, anisotropic parameters, and the unsaturated permeability function for each material in the Define Hydraulic Properties dialog.

You may choose from the following permeability models:
  • Brooks and Corey
  • Fredlund and Xing
  • Gardner
  • Van Genuchten
  • Simple

Built-in data tables are available at the click of a mouse, providing typical input parameters for a variety of material types. References are provided for each data set.
Water Table
After a groundwater seepage analysis, RS2 will display the Water Table which has been determined from the analysis. The Water Table represents an iso-line of zero pore pressure.

The Water Table can be copied to the clipboard or saved to a DXF file, for import into other programs.
Discharge Sections
A Discharge Section in RS2 is a user-defined line segment, through which the steady state, volumetric flow rate of groundwater, normal to the discharge section, will be calculated during a finite element seepage analysis. The value of the flow rate will be displayed in the RS2 Interpret program, when you view the analysis results.
Flow Lines
A flow line represents a path of fluid flow through the material. Flow occurs in the direction of decreasing Total Head. For a material with isotropic permeability, flow lines are perpendicular to contours of Total Head. Flow lines can be added individually to a model, with the Add Flow Line option, or multiple flow lines can be simultaneously generated with the Add Multiple Flow Lines option.
Flow Vectors
The Flow Vectors option will display the groundwater flow velocity vectors at each node of the mesh. The Flow Vectors indicate the direction of groundwater flow, and the relative size of the Flow Vectors indicates the relative velocity of the groundwater flow.

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