Visualizing Precisions

Estimated local error images are used to visualize computation error maps, which represent scalar field quantities defined as the distribution of energy error norm estimates for a given computation.
Estimated local error Image objects belong to Static Case Solution objects sets.

The program evaluates the validity of the computation and provides a global statement about this validity. It also displays a predicted energy error norm map which gives qualitative insight about the error distribution on the part.

This task shows how to generate Estimated local error images on parts.

You can use the sample25.CATAnalysis documen.

Before You Begin:

Go to View -> Render Style -> Customize View and make sure the Edges, Shading, Outline and Materials options are active in the Custom View Modes dialog box.

Compute the solution: for this, click the Compute icon .

1. Click the Precision icon

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The Estimated local error image is displayed and an Estimated local error Image object appears in the specification tree under the active Static Case Solution objects set.

You can visualize the Estimated Error image in different ways by modifying the Custom view modes. To do this, you open the View menu and select Render Style -> Customize View option.

The Estimated local error distribution on the part is visualized in fringe pattern mode, along with a color palette.

This map provides qualitative information about the way in which estimated computation errors are relatively distributed on the part.

	If the error is relatively large in a particular region of interest, the computation results in that region may not be reliable. A new computation can be performed to obtain better precision.
	To obtain a refined mesh in a region of interest, use smaller Local Size and Sag values in the mesh definition step.

2. When the mouse cursor is passing over a finite element, its Error Estimate (relative strain energy variation) is displayed.

3. Click on a finite element to obtain a steady display.

4. Double-click the Estimated local error object in the specification tree to edit the image.
The Image Edition dialog box is displayed.

Display on Deformed Mesh option,

The following tabs are available:

	`Visu` tab (how): provides a list with visu types (Fringe, Text, Symbol). As you change the Visu option type, the name of the `Estimated local error`Image object in the specification tree is modified (error, error text, error symbol). Both the option type and visualization are appended to the name.
	`Criteria` tab (what mathematical object type): provides a list with criteria (`SCALAR`)
	`Filters` tab (what): provides different filters. You can choose to generate images on nodes, elements, nodes of elements, center of elements or Gauss points of elements.
	`Selections` tab: either all or, in the case of CATProducts, pre-defined groups of elements belonging to given mesh parts can be multi-selected. In other words, given elements associated to a mesh part are automatically grouped and you can multi-select these groups (only available if you installed the ELFINI Structural Analysis product).

In addition, the following Image Edition buttons are available:

Iso/Fringe: press this button to open the Image Iso Fringe Editor dialog box (only available if you installed the ELFINI Structural Analysis product).

5. Click OK to quit the dialog box.

You can use the right mouse click (key 3) on a Estimated local error feature in the specification tree and select the option called Activate / Deactivate to turn the corresponding image on or off.

Products Available in Analysis Workbench

The ELFINI Structural Analysis product offers the following additional features with a right mouse click (key 3) on a Estimated local error feature in the specification tree:

Report: this icon generates a report in .html and .txt formats.