Version 6.0 - February 2019
•Build your unstructured MODFLOW-USG model using the same workflow steps and tools as in a structured Finite Difference model:
oDefine Modeling Objectives
oDefine Model Properties
oAdd Boundary Conditions
oDefine ZoneBudget Zones
•Define Quadtree Grids (Q-Grids)
•Refine vertical layers when creating unstructured grids
•Make use of advanced translation settings which provide greater flexibility in how your model simulations are formulated
•Support for the Ghost Node Correction (GNC) package
•Flex is now installed with MODFLOW-USG v1.4, the latest official USGS version as of the release date of Flex 6.0.
•Support for mod-PATH3DU*, which enables particle tracking in unstructured grid (MODFLOW-USG) models:
•Enhanced particle tracking capabilities for MODPATH and mod-PATH3DU allowing you to define:
oGroups of particles that can be tracked and visualized separately
oSeparate particle release times for each particle group
oLocations of particles based on existing or drawn point, polyline, polygon, or well features
oParticles in the cross-section (row/column) views of Finite Difference grids
oParticle elevations based on layer(s), surface(s), or a specified constant elevation
* Note: mod-PATH3DU is a free utility developed by S.S. Papadopulos, Inc. (SSPA) that must be downloaded and installed separately from the SSPA website. Version 2.1 and higher are supported. Note, that Version 3.0 includes improvements to handle a wider variety of unstructured grids
•ZoneBudget is now supported in unstructured MODFLOW-USG models
•You can use point, polyline, or polygon features to define Zone Budget zones and Zone IDs can be specified using feature attributes
•Visualize velocity vectors in finite difference and unstructured grids. View:
oIn-plane velocity vectors
oColor maps of out-of-plane velocities
oDisplay average or Darcy velocities (total or in-plane) or by direction
•Specify a line feature along which to show cross-sectional color maps of unstructured grid model properties and outputs
•Cell Inspector now includes Layer/Model Top and Bottom elevations, and the magnitude and X-, Y-, and Z-components of the average/Darcy groundwater velocity
•When creating horizons, you can preview how the rules will be enforced in the 3D Viewer rather than viewing the raw surfaces.
•Field calculator/expression builder for editing model properties and boundary condition includes:
ocell geometry variables: Cell Bottom ($BOT), Model Bottom ($MBOT), Cell Thickness ($DZ), Cell Width ($DX), and Cell Length($DY) and
oadditional math functions: LOG, LOG10, NOT, ABS, DOT
•Copy Model (Flow/Transport) Properties and Boundary Conditions to from one Layer, Row, or Column to other Layers. Rows, or Columns
•Edit cells (active/inactive, zone budget) in row/column views.
•You can import distributed property values from Classic Models
•Map elevation to a field in source data when importing points from shapefile
•Model outputs including groundwater heads, drawdown, velocity, and concentrations can be exported to text files
•Export contours as polyline shapefiles
•Head and Concentration Observations can be specified as separate groups so that you can view and filter these separately at the View Charts step
•Performance improvements on project open and close operations for larger projects.
•Output Control file translation supports the use of keywords or codes and the standard or compact budget formats to provide support for both MODPATH and RT3D.
•Added MT3D-MS and RT3D summary output (.OT) files to the open files dialog at the model run step
•Intermittent and unhelpful translation error “Vmac is running in the task bar, please close it and try again”.
•Deleting particles by drawing a box does not actually delete particles
•Well schedule not translated correctly if the project time unit is not in days
•In some cases, particularly if the whole output water table exceeds the model ground surface it was rendered at Elevation=1
•Modifications to a pumping well boundary condition propagate to all runs under the same grid
•Concentration observations contained incorrect column names
•Project Clean-up/Remove orphan objects from model
•If all boundary conditions of a given type were deleted, they would still run in the model due to advanced run settings. You are now prompted to remove the translated file or back-it up so that it no longer runs in the model
•In some cases, the schedule for pumping wells with relative times does not import correctly
•In some cases, assigning a schedule to a conceptual boundary condition results in an error message that the schedule occurs before the model start date even if this is not true
•Concentration observations incorrectly handled for simulations with multiple species
•Transient Fluxes (Model Results) are not shown or exported, only Flux from first time step.
•Fluxes not displaying properly in 3D Viewer
•Cells remain active if boundary condition is applied to 'Top' of model domain
•MODFLOW-USG, BCF package fails to translate if property values are edited
•When using a uniform grid, the CM->NM conversion does not add conceptual BCs assigned to model top to Layer 1 rather than the upper-most active layer
•When importing heads file as 3D gridded data to a Rotated Grid Project, error "Object reference not set to instance of object appears"
•Inconsistent/compound units are not correctly converted for certain RT3D reaction parameters
•Water table for USG does not take ponding into account
•Reinstalling Visual MODFLOW Flex does not replace MODFLOW-SURFACT with the demo version in the engines folder
•Flex does not always cleanly delete elements from the Model Explorer, resulting in large file sizes
•In some cases, MODFLOW-USG conceptual model conversion results in incorrect parameter values, and causes parameter editing to fail
•Out of memory error when attempting to display certain DXF files in 2D view of Flex viewer or standalone 2D viewer
•Multiple Lake BCs result in a multiple key error upon translation
For full version history, see the Visual MODFLOW Flex readme file at: https://www.waterloohydrogeologic.com/visual-modflow-flex-readme/