Adding Extra Dimensions to a Model
To add an extra, abstract spatial dimension to a model, right-click the Global Definitions node (), and then from the Extra Dimensions context menu, choose 3D, 2D Axisymmetric, 2D, 1D Axisymmetric, or 1D to add an extra dimension to the selected space dimension (requires that Extra Dimensions is selected in the Show More Options dialog box). An Extra Dimension node, in the chosen space dimension, is then added under the Global Definitions node in the Model Builder. You can add one or several Extra Dimension nodes. It is also possible to attach an extra dimension to several components. Extra dimensions can be useful, for example, to model transport and reactions in two different scales, where one scale is the homogenized scale of a set of larger pores between particles or larger cracks in rocks, and a second smaller scale is the one inside porous particles or in porous rock.
The added node then contains these default nodes: Definitions, Geometry, and Mesh. The settings for the Extra Dimension node are the same as for the Component node, except it has a unique Name.
The default nodes associated to the Extra Dimension are considered the extra dimension geometry and extra dimension mesh. The original geometry and mesh are called the base geometry and base mesh.
Before you can use the extra dimensions in physics interfaces, they must be attached on a selection in the base geometry.
The default node label in the Label field is Extra Dimension 1 for the first Extra Dimension node. The component name is a string used to identify variables in the model. The default Extra Dimensions component name is xdim1, xdim2, and so on, but you can change it in the Name field.
Using Extra Dimensions