To display the option, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box; then right-click the main physics interface node and select Global>Discretization to add extra Discretization nodes ().

Use Discretization nodes to specify multiple discretizations (shape function type and order) for the same physics, typically using different element orders. In study steps and the Multigrid Level subnodes, you can select among the discretizations specified for each physics interface (in the main physics interface node’s Settings window and in any added Discretization nodes); see Modifying the Model Configuration and Multigrid Level. This may be used to manually create a multigrid hierarchy, or just to compare the effect of different discretizations in different studies.

The Discretization node’s Settings window has one Discretization section, and it contains the same list of shape function types and orders for the fields in the physics as the Discretization section found in the main physics interface’s Settings window.