Reduction and Multiple Reduction

Video: Reduce vector results across multiple time steps

Use the Reduction and Multiple Reduction commands to reduce one or more results components to scalar values at nodes. These scalar values are represented as post-processing expressions. You can view and export the expressions in a variety of ways, and you can combine scalar post-processing expressions using standard expression syntax.

For example, to return the Tresca criterion at nodes from linear statics results, you could reduce the maximum principle stress and minimum principle stress to scalar values using the post-processing expressions SMAXP and SMINP. Then enter the expression (SMAXP-SMINP)/2 in the Formula field.

Note:

Although you can combine and manipulate post-processing expressions using standard expressions syntax, post-processing expressions are only available when using the Reduction and Multiple Reduction commands.

You use the Reduction command to view, save, or export scalar results for a single load case, time step, mode, iteration, and so on. You use the Multiple Reduction command to graph, save, or export scalar results across a range of time steps, modes, frequencies, iterations, and so on.

From both commands, you can access the Create Expression dialog box. The options on this dialog allow you finer control over the reduced values defined in the expression. For example, you can specify the absolute value of signed data, averaging options for element-nodal results, shell layers or beam recovery points, complex results parameters, and so on.

Maximum XY membrane strain for a selected shell mesh, reduced to a scalar value, plotted against frequency, and output as a table field.

Exporting reduced results

Results components that have been reduced to scalar values can be exported in a number of formats:

• Both the results of the Reduction and Multiple Reduction commands can be exported as full or companion results in UNV format.

• The results of the Reduction command can be saved directly to a table field.

• When you graph the results of the Multiple Reduction command, you have the option of saving the graph data to a table field or an AFU file.

Displaying reduced results

You can immediately display results components that have been reduced to scalar values without saving them to an external file or field:

• Expressions or combined expressions created using the Reduction command can be displayed as a contour plot in a new post view.

• Expressions or combined expressions created using the Multiple Reduction command can be displayed as a graph in an existing viewport or in a new graph window.

Graphing multiple reduced results

When you use the Multiple Reduction command, you can graph reduced values against the iteration ID, time step, frequency, and so on (depending on the solution type). Select FE entities, points, or polygon geometry to specify the values to plot. If you select multiple entities or geometry, you can plot the values as multiple data series, or select Combine Across Entities to plot them as a single data series.

When you graph values using the Multiple Reduction command, you can choose to save the output as a field or an AFU file.

Where do I find it?

Reduction and Multiple Reduction commands

Application	Pre/Post
Prerequisite	One or more loaded results files.
Command Finder	Reduction Multiple Reduction

Create Expression dialog box

Application	Pre/Post
Prerequisite	One or more loaded results files
Command Finder	Reduction Multiple Reduction
Location in dialog box	Scalar Reduction dialog box→Expression Manager group→Add Expression Multiple Reduction dialog box→Expression Manager group→Add Expression

How do I

Display reduced results in a post view

Export reduced results to a UNV file

Save reduced results to a field

Export multiple reduced results to a UNV file

Graph multiple reduced results

Create post-processing expressions

Edit and manage post-processing expressions

Quick links

Command reference

Pre/Post video examples

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Simcenter 3D tutorials

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Reduction and Multiple Reduction, Simcenter 3D 2021.1 Series

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