Video Series – Defining Finite Difference Grids

March 12, 2019

Conceptual Modeling: Defining Finite Difference Grids

This video describes the seventh step in the conceptual modeling workflow: Defining Finite Difference Grids. The final step before converting your conceptual model to a traditional numerical model is to generate a grid which will be merged with the existing property zones and boundary conditions. Most versions of MODFLOW (including MODFLOW-2000, MODFLOW-2005, MODFLOW-LGR, etc.) require finite difference grids, which are rectilinear, to operate. Three finite difference grid types are supported in the vertical dimension, including uniform, semi-uniform and deformed vertical grids. Once the initial finite difference grid has been created grid refinements (both vertical and horizontal) can be performed at the ‘View Finite Difference Grid’ workflow step. This step also allows you to activate or deactivate specific grid cells and define child grids for MODFLOW-LGR simulations. When a finite difference grid is available the subsequent workflow step to ‘Convert to MODFLOW Model’ will become available, allowing you to merge your conceptual model elements (property zones, boundary conditions) with available finite difference grids.