The Conduction and Dispersion Package pane is used to activate the Conduction and Dispersion package. The CND: GWE Conduction and Dispersion Package pane is on the MODFLOW Packages and Programs dialog box under Groundwater Transport| | GWE: Groundwater Energy Transport Process.
By default, the CND Package uses the mathematical formulation presented for the XT3D option of the NPF Package to represent full three-dimensional anisotropy in groundwater flow. XT3D can be computationally expensive and can be turned off to use a simplified and approximate form of the dispersion equations that also account for conduction in a heat transport model. For most problems, however, XT3D will be required to accurately represent conduction and dispersion.
Activating XT3D RHS adds xt3d terms to right-hand side, when possible. This option uses less memory, but may require more iterations.
