Using selection recipes with result probes

You can use a selection recipe to specify the entities to include in the result probe. For example, you can set up a result probe that uses an attribute selection recipe that returns all points named PT, such as P1, PT2, and so on, and generates a list of their arithmetic mean Z displacement value as shown in the figure.

Because you use a selection recipe to specify the entities, when you edit the model, such as change the mesh, the entities in the result probe update. In the example in the figure, if you change the location of the points, remove or add points, or change their names, the result probe still finds the mean Z displacement value of the changed points.

Specifying the selection recipe

You can specify all types of selection recipes, including attribute selection recipes that return points, faces, or nodes or a combination of types. To specify the selection recipes, in the Result Probe dialog box, set the Selection Type list to Selection Recipe. Then select the selection recipe from the Simulation Navigator.

For more information about selection recipes, see Selection recipes.

Limitations

Note the following about using selection recipes:

• If you use a selection recipe in a result probe, you cannot change the entities that the selection recipe returns. For example, you cannot change a selection recipe that returns points to one that returns faces.

• You can specify multiple selection recipes, but the selection recipes must be of the same type as the first selection recipe you specify. For example, if the first selection recipe you specify returns points, you cannot specify a second selection recipe that returns nodes.

• You can specify a bounding volume selection recipe that returns multiple types but not if one of the types is points. If one of the types is points, the Simulation Navigator does not let you select it for a result probe.

Selection recipe example

The following shows how to define a result probe that lists the displacement in the Z direction of all points in the model named PT that a selection recipe returns. If the selection recipe returns only one point, the result probe lists its Z displacement. If the selection recipe returns more than one point, the result probe lists the arithmetic mean Z displacement value of all points.

• Define the selection recipe.

• Create the result probe and generate the list. Specify the Disp_z result variable and the selection recipe.

Step 1: Define the selection recipe.

1. In the Simulation Navigator, right-click the Selection Recipes node, and choose New Selection Recipe.

2. In the Name box, type Points.

3. From the Strategy list, select Attribute.

4. From the Attribute list, select Name.

5. Click Add Attribute .

6. From the Value Type list, select Single Value.

7. In the Value box, type PT*, where * represents a wildcard of one or more characters. Press Enter to add the name to the Attributes list table.

8. Click OK.

Step 2: Create the result probe and generate the list.

1. Choose Results tab→Result Probe .

2. In the Name box, type Displacement.

3. In the Formula box, type Disp_z.

4. From the Selection Type list, select Selection Recipe.

5. In the Simulation Navigator, select the Points selection recipe.

6. From the Geometry Value list, select Arithmetic Mean.

7. From the Output Options list, select List.

8. Select the Create Output check box.

9. Click OK.

The selection recipe returns three points named PT1, PT2, and PT3 and the result probe lists their arithmetic mean Z displacement value.

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