Averaging options for elemental and grid point results

When the post-processor averages elemental or grid point results, by default, it does so across all elements that share a node.

For example, suppose that node E is common to four elements.

The unaveraged elemental or grid point results are as follows:

• For element A, the result is 20

• For element B, the result is 22

• For element C, the result is 24

• For element D, the result is 26

When you select averaging, the post-processor computes the average of the elemental or grid point result for node E to be 23. Therefore, when the post-processor creates the post view it uses 23 for the value at node E.

Situations may exist, however, where you do not want the elemental or grid point results of all the elements that share a node to be averaged into a single value. In the Post View dialog box, Result tab when you select Nodes from the Combine At list, the post-processor allows you to control the averaging based on any combination of material and property IDs of the elements, element types, and feature angles. When you control averaging with these options, the post-processor applies the averaging option at every node.

Averaging based on material ID, property ID, and element type

Suppose that elements A and B are solid elements and elements C and D are shell elements. If you clear the Element Type check box, the post-processor creates two averages at node E.

• For elements A and B, the post-processor uses 21 as the value at node E when it creates the post view.

• For elements C and D, the post-processor uses 25 as the value at node E when it creates the post view.

Averaging based on the material and property IDs of the elements is done similarly.

• To create separate averages at a node for each element referencing a different material ID, clear the MID check box.

• To create separate averages at a node for each element referencing a different property ID, clear the PID check box.

Averaging based on feature angle

You can use the feature angles option to prevent the post-processor from averaging the elemental or grid point results across feature edges.

If you clear the Feature Angle check box and enter a value in the Feature Angle box that is less than the feature angle across the feature edge, the post-processor does not average across the feature edge.

For example, suppose that a feature edge lies where the elements form a crease and that the angle between the two features is 150°.

The unaveraged elemental or grid point results are as follows:

• For element A, the result is 50

• For element B, the result is 65

• For element C, the result is 70

• For element D, the result is 85

If you clear the Feature Angle check box and in the Feature Angle box enter 90° (or any other value less than 150°), the post-processor computes two averages for node E.

• For elements A and C, the post-processor uses 60 as the value at node E when it creates the post view.

• For elements B and D, the post-processor uses 75 as the value at node E when it creates the post view.

If you clear the Feature Angle check box and in the Feature Angle box enter 180° (or any other value greater than 150°), the post-processor computes a single average of 67.5 for node E, which it uses for node E when it creates the post view.

Averaging based on multiple criteria

You can also use combinations of the four averaging criteria to control how the post-processor averages elemental or grid point results.

When you use multiple criteria, at each node, the post-processor calculates an average value for each group of elements that satisfies all the criteria in the same way.

For example, suppose that elements A, B, and C reference a material property that has 10 as its ID and element D references a material property that has 20 as its ID.

If you clear the MID and Feature Angle check boxes and in the Feature Angle box enter 90° (or any other value less than 150°), at node E the post-processor identifies three groups of elements that satisfy the criteria in the same way.

• Elements A and C are on the same side of the feature edge and they both reference the same material property.

• Element B references the same material property as elements A and C, but it is on the opposite side of the feature edge.

• Element D is on the same side of the feature edge as element B, but it references a different material property.

Thus, the post-processor uses the following values for the elemental or grid point result at node E when it creates the post view:

• For elements A and C, the post-processor uses 60.

• For element B, the post-processor uses 65.

• For element D, the post-processor uses 85.

Excluding internal elements from averaging

Internal elements are elements that do not possess a free face. Nodes on free surfaces of a mesh may be used in the connectivity of internal elements. To exclude the elemental or grid point results of internal elements from being used in the averaging at such a node, clear the Include Internal Elements check box.

Note:

The Include Internal Elements option is available when the Feature Angle check box is selected.

Learn more

Using element-nodal results to create elemental displays

Options for elemental results

Options for element-nodal results

Look up more details

Nodal combination options for element-nodal results

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Averaging options for elemental and grid point results, Simcenter 3D 2021.1 Series

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