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Program Overview
VGFlow2D is the saturated-unsaturated seepage analysis program using Finite Element Method(FEM) which is collaborated with Gunma University. VGFlow2D for 2D analysis and VGFlow3D for 3D analysis are available with the difference of pre-post. This program uses strict saturated-unsaturated seepage analysis based on Richards equation, and covers all topics without simplifying so that the applicable scope is not limited and you can use this product for general-purpose.

Especially, the latest knowledge learned from the disaster instance due to the current torrential rain increase opportunities of seepage analysis. Production of the pore pressure that comes along with the torrential rain can be simulated by FEM analysis.

Related Information
New product (in Japanese)

Functions and Features
Applicable scope
  • This program allows the consideration of seepage flow according to the general construction in "Japanese Road Construction Guideline"-revising in progress, the construction standard of water stop structure in "Technical Criteria for River Works", "River Bank Structure Guideline", "High-Standard Bank Embankment Design and Enforcement Manual" , "Ministry of Agriculture, Forestry and Fisheries of Japan, land reform project design standard", "All-purpose Dam Construction".

  • Steady flow analysis and unsteady flow analysis can be performed, and a wide range of boundary conditions are supported so that almost all 2D seepage phenomenon can be modeled.

    Analysis Type Steady flow analysis
    Unsteady flow analysis
    Analysis Model Two-dimensional vertical plane flow model
    Axisymmetric flow model
    Two-dimensional horizontal plane flow model
    Boundary Conditions Known hydraulic head(:Steady:Unsteady)
    Potential seepage face(:Steady:Unsteady)
    Fluctuating water level(:Unsteady)
    Outflow forbidden(:Unsteady)
    Point source(:Steady:Unsteady)

    Boundary Conditions

Saturated Seepage
  • Anisotropy of water permeability coefficient, terrain inclination
Unsaturated Seepage
  • The following 2 settings are available:
    • Analysis by the vanGenuchten model (identification value)
    • Analysis by the table of moisture characteristic curve (θ-ψ curve) and unsaturated hydraulic conductivity (θ-Kr curve)
  • Allowing terrain configuration model creation from a variety of electronic medium and drawing (AutoCAD2007, SXF, and printed drawing). Automatic mesh is also supported.
  • Common operating interface with our geotechnical series FEM products
  • Anisotropy of water permeability coefficient, terrain inclination
  • Cutoff wall available
  • Simultaneous setting of rainfall boundary and water level variation boundary
  • Automatic calculation of pressure hydraulic head node value from initial seepage surface input in the unsteady analysis
  • Saturated-unsaturated seepage FEM steady and unsteady analysis is available. As FEM analysis result, model figure, equal potential contour, equal pore pressure chart, hydrodynamic gradient figure (horizontally and vertically), and saturate rate figure export.
  • Direct input via table for unsaturated seepage property
  • Support for Japanese main parameter including "River Bank Structure Guideline"
  • Obvious output with animated time history for unstable analysis result

  • This is FEM analysis software but its interface is very similar to our UC-1 design software, so that the customer can manipulate as usual design software. In addition, this interface is common mesh split interface with other geotechnical series, it results in time savings in the learning the operations.
  • Click to enlarge the image.
  • AutoCAD2007 format and SXF format CAD file can be imported, and modeling by scanning of the drawing (paper information) is available.

Statement output function of preprocessor
  • All input items from the model creation tab to analysis condition tab can be output with graphical figures. It can freely be customized by switching items on the printing setting window, thus you can output statements required.
Setting window of printing items of pre part [Calculation sheet] model figure
[Calculation sheet] water level
variation boundary
[Calculation sheet] element definition

  • Gunma University's Solver whose quality and reliability has been highly-acclaimed is used.

Many post output functions and animations allow the access of the analysis result visually in all aspects.
This application allows the output of FEM analysis result in flow net(streamline net), and the time transition of flow net can be checked in animation.
Unsteady analysis results can be saved in AVI format as a movies file.

Statement output function of PostProcessor
  • Post processor outputs all analysis results from model figure to numerical output with graphical figures. Like the preprocessor, output contents can freely be customized by switching items on the printing setting window. Output flexibility is well considered, so that node number, element number, and time range (during unsteady analaysis) can also be customized.

Click to enlarge the image. Click to enlarge the image.
Setting window of print items of Post part
Click to enlarge the image. Click to enlarge the image.
[Calculation sheet]
Contour figure - equal potential
[Calculation sheet]
Vector figure
Click to enlarge the image. Click to enlarge the image.
[Calculation sheet]
Time history figure - node
[Calculation sheet]
Time history figure - element

■Applicable scope
  1. Check of the rainfall influence against road banks
  2. Influences of rainfall and spring in large basin
  3. Measures of seepage surface and water pressure distribution in river levee
  4. Design calculation of fill type dam body and investigation of seepage on the ground around reservoir
  5. Examination of permeability in the basic process like curtain grouting
  6. Design calculation of dam body of reservoir and one for disaster prevention
  7. Examination of piping and boiling during excavation
  8. Influences of confined groundwater
  9. Effect of drainage well on pore pressure distribution in landslide region 
  10. Investigation of seepage in cofferdam 

■Enhancement of CIM function on the geotechnical analysis series products
We enhanced the CIM (Construction Information Modeling) function of various products in the geotechnical analysis series. The programs can cooperate terrain data or data created with each geotechnical analysis programs smoothly.  
Data linkage using terrain data file (*.GF1)
Geotechnical Finite element Elastoplastic Analysis Software (GeoFEAS)2D Ver.3

The amount of displacement imported to Flexible structure sluiceway design for further analysis
By importing results of ground deformation analysis (settlement / horizontal displacement distribution) to the "Flexible structure sluiceway design", the level2 seismic test for the longitudinal direction can be performed.
画像をクリックすると大きな画像が表示されます。 画像をクリックすると大きな画像が表示されます。
GeoFEAS2D Flexible structure sluiceway design

It can modelize only ground that a surrounding ground effect analysis is conducted in the Temporary sheathing work design. The ground deformation can be calculated by giving the wall displacement as the forced displacement. 
Dynamic effective stress analysis for ground (UWLC)

Acceleration rate imported to Slope stability analysis for further analysis
When applying the Newmark method to high embankments with a height of about 30 m or more, it is necessary to input the response acceleration waveform of the slip soil mass as the ground motion.
Data linkage between "Dynamic effective stress analysis for ground (UWLC)" and "Slope stability analysis" corresponds to the Newmark method analysis calculated by using the response acceleration waveform.
The level2 seismic stability calculation for high embankment and large embankment.
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UWLC Slope stability analysis
2-D seepage analysis(VGFlow2D)

Water line data imported to GeoFEAS2D
画像をクリックすると大きな画像が表示されます。 画像をクリックすると大きな画像が表示されます。

Water level data imported to UWLC
Water line and potential line imported to Slope stability analysis
Saturated / unsaturated seepage FEM analysis results can be reflected by file linkage (*.PRS [water line], *.PTN [isopotential line]).
GeoFEAS Flow3D (limited to the seepage analysis)

Water level data imported to LEM3D
Analysis results computed with GeoFEAS Flow3D (limited to the seepage analysis) or third party's product can be imported to 3-D slope stability analysis(LEM). It creates underground water level required for landslide analysis and enables the 3D slope stability analysis.
画像をクリックすると大きな画像が表示されます。 画像をクリックすると大きな画像が表示されます。

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