Relatively simple geometries are defined in the Rectangular dialog window for two-dimensional. In this window, users need to specify the horizontal dimensions of the transport domain, as well as a possible slope of the base of the domain in different directions (if applicable; α is in the x-direction). The middle of the dialog window previews a simple example showing all geometry parameters. This preview should help users in specifying the desired transport domain (Dimensions and Slope).
How the Rectangular Geometry is discretized into FE-Mesh is specified in the Rectangular Domain Discretization dialog window.