Geometry Command

The Fields Calculator Geometry command opens a dialog box for selecting a geometry to load into the top register of the calculator.

Do this to

find the value of derived field quantities on any point, line, surface, or volume.
plot quantities directly from the calculator.
display a previously defined isosurface, maximum or minimum field point using the Draw command.

The following types of geometries are available:

Point	See Drawing a Point Object. Drawn points are listed in the calculator's Geometry dialog box when Point is selected.
Line	See Drawing a Line Segment or Drawing a 3D Line Segment. Drawn lines are listed in the calculator's Geometry dialog box when Line is selected. To set the number of points on a line, see Geom Settings.
Surface	Allow operation on the adjacent side surface geometry just like regular surface geometry. All calculation on this geometry will be done using data from the adjacent side of the surface. Support scripting, saving and loading expression with adjacent side surface geometry.
Volume	3D objects, Regions, and Object Lists (of 3D objects including AllObjects) are available in the calculator's Geometry dialog box when Volume is selected.
Coord	Coordinate systems are available in the calculator's Geometry dialog box when Coord is selected.

To load a geometry into the calculator:

In the Fields Calculator, click Geometry.
The Geometry dialog box appears.
Select a geometry type.
A list of all applicable geometries appears. If a design includes Layout Components, the Geometry list shows the available component geometries as well.
Note:
- Non-convex 3D non-model solids are not supported for Field Overlay Plots and Fields Calculator computations.
- Object lists containing non-model object(s) are supported for Field Overlay Plots but are not supported for Fields Calculator computations.
In the modeler window, these Layout Component objects are drawn as visualizations without actual geometry. However, they can be used to calculate field quantities as shown below.

These geometry operators can be used to perform computations just like one constructed from regular 3D geometry. These additional objects are generated only after reading a mesh, so they won’t show up if there is no solution.
Click the geometry.
Click OK to load the geometry.

Note: Consider a box (Box2) that is completely enclosed in a bigger box (Box1), so that no faces of Box2 are touching any faces of Box1. Box2 is actually implicitly subtracted from Box1 as is done in our solvers. So Box1 is used as if Box2 were already subtracted from Box1. Volume(Box1) is Box1 excluding Box2, and Surface(Box1) contains faces from both Box1 and Box2.

Background Geometry

For 2D solver simulations that include a Balloon boundary condition, the Geometry dialog box includes entries for background and AllObjectsPlusBackground. The background is the part that is outside the geometry but on which the solver generated a mesh.

Including the background in the calculation will affect the results as demonstrated in the following figure:

Note: For a 2D solver simulation that does not include a Balloon boundary condition, but includes other boundary conditions, such as a VectorPotential, you may see background listed in the Geometry dialog box, but in this case, the background has no geometry and has no effect on the calculations.

Related Topics:

Using the Fields Calculator