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What's New in Visual MODFLOW Flex 2014.1

Visual MODFLOW Flex 2014.1 delivers support for MODFLOW-USG - a new finite volume version of the USGS MODFLOW groundwater modeling program, that uses flexible and efficient unstructured grid geometries.



    Benefits of Unstructured Grids


  • Increased Simulation Accuracy
    Unstructured grids permit local grid refinement along model features such as wells and boundary conditions, in addition to supporting fully discontinuous layers, both of which deliver high resolution detail and accuracy around areas that matter the most.
  • Reduced Simulation Runtimes
    Traditional MODFLOW grid refinement often results in an excessive number of grid cells outside the areas of interest which leads to an inefficient numerical model with unnecessary long run times. With unstructured grids, the grid refinement is focused only to the areas of interest, resulting in much fewer grid cells, more stable grid structures, and therefore reduced run times.
    Further Reading: MODFLOW-USG Benchmark Tests Demonstrate a 96% Reduction in Simulation Run Times
  • Superior Modeling of Complex Geology
    Unstructured grids are flexible and conform easily to the natural variability found in surface features and subsurface stratigraphy. Unstructured grid layers permit discontinuous layers that pinch-out to zero thickness, providing a more realistic representation of complex hydrogeological conditions, and improved model stability.
  • Increased Numerical Stability
    Unstructured grids in Visual MODFLOW Flex 2014.1 are composed of a special type of polygon called Voronoi Cells. Voronoi Cells are superior to other unstructured grid geometries (nested grids, quad-tree grids) as they completely honor the Control Volume Finite Difference (CVFD) constraints, and therefore do not require the Ghost Node Correction (GNC) package. In addition, well and boundary condition nodes coincide exactly with the grid nodes. This results in an efficient, robust and dependable numerical grid, with improved convergence and accuracy.


Localized refinement around wells and boundaries


Discontinuous geology


Voronoi Cells

    Why use Visual MODFLOW Flex for MODFLOW-USG simulations?


  • Intuitive, Easy-to-use Interface
    Visual MODFLOW Flex 2014.1 provides an easy-to-use interface for defining model inputs, running the model and visualizing impressive detailed 2D/3D renderings of model results.
  • A Multi-Model Environment
    The conceptual modeling approach in Visual MODFLOW Flex allows you to easily generate an unlimited amount of numerical models from a single 3D conceptual model - all within a single project. Results from multiple numerical models can be compared and analyzed side-by-side within the same environment. This allows you to compare various MODFLOW-USG models with various levels of refinement, and validate against MODFLOW-2005 models.
  • The Conceptual Modeling Approach
    The conceptual modeling approach makes it easy to build a 3D MODFLOW-USG numerical model. GIS-based representations of your boundary conditions (points, polygons, polylines) are automatically included in the grid generator, providing for a natural and intuitive workflow. Discontinous formations defined in the conceptual model are automatically converted to zero thickness layers in the unstructured grid. Numerical model inputs such as properties, wells, and boundaries are automatically populated from conceptual data.
  • Robust Grid Generator
    Visual MODFLOW Flex has a built-in grid generator for unstructured grids that provides reasonable default settings for voronoi cells, and control over refinement levels around the model boundary, lines, and wells. Grids are efficiently refined around features, while maintaining the CVFD criteria, for superior performance and accuracy.
  • Powerful 2D/3D Visualization
    Visual MODFLOW Flex's powerful 2D and 3D viewers are capable of displaying high-resolution renderings of your model inputs and results. Using interactive viewer controls you can visually inspect and analyze your results from any virtually angle to gain the critical insight needed to deliver effective decisions.

  • Demonstration Video

    In the short video below, Wayne Hesch, Product Champion for Visual MODFLOW Flex, demonstrates the use of MODFLOW-USG to simulate groundwater flow for a simple 3 layer model in Visual MODFLOW Flex 2014.1.



                           


    Learn More

    Advance your knowledge of MODFLOW-USG and shorten your learning curve with a variety of comprehensive learning resources and multimedia.


  • Learning Resources
    • MODFLOW-USG Frequently Asked Questions
    • MODFLOW-USG Webinar Recordings
    • MODFLOW-USG Tutorial
    • Glossary of Terms
    • Distribution Page from the USGS
  • Further Reading
    • MODFLOW-USG Overview
    • A Comparison of Structured Grids (MODFLOW-2005) and Unstructured Grids (MODFLOW-USG)
    • MODFLOW-USG & Voronoi Cells: Unstructured Grids in Visual MODFLOW Flex
    • Benchmark Tests: Comparing model results/run times of MODFLOW-USG to FEFLOW and MODFLOW-2005
    • Overview of Different Numerical Methods (Finite Difference/MODFLOW-2005 vs Finite Element/FELFOW vs Finite Volume/MODFLOW-USG)

  • Download Free Trial

    Try MODFLOW-USG today with a free 30-day fully-functional trial of Visual MODFLOW Flex 2014.1.
    Download Free Trial
    Have questions during your trial? Feel free to contact our technical support team at sales@woorimtech.com.
    Click here to visit the main Visual MODFLOW Flex product page.


Visual MODFLOW 2011.1 includes the following new features:

  • Support for MODFLOW-NWT : MODFLOW-NWT - a new and improved version of MODFLOW - provides improved handling of water table fluctuations over multiple model layers. Learn more...
  • Leverage the power of multi-core processors : The added parallel processing support for various solvers (PCG, WHS & SAMG) and MT3DMS allows you to take full advantage of your multi-core processors and run simulations significantly faster.
  • Improved capacity for larger models : Visual MODFLOW v.2011.1 now supports 64-bit versions of MODFLOW-2000, MODFLOW-2005, MODFLOW-NWT and SEAWAT, providing more power and greater capacity when running large and/or complex simulations.
  • Accelerated and more efficient solving performance1 : The new LMG2 interface for the SAMG multigrid solver drastically reduces model run times, especially when dealing with large grids and highly variable conductivity fields. Benchmark tests have shown SAMG to be 100 times faster than the PCG solver and up to twice as fast as the GMG solver. Learn more...
  • More options for defining evapotranspiration : Evapotranspiration (EVT) boundary conditions can now be applied to different model layers during the simulation, allowing for more accurate and representative models.
  • Extended capabilities for lake boundary conditions : New options for lake boundary conditions allow for better handling of lakes with steep gradients where there is both vertical and horizontal flow between the lake and aquifer.
  • 1Only available with Visual MODFLOW Premium

    Additionally, a Visual MODFLOW Users group has been created on LinkedIn. Click here to join.