Working with reusable regions

Use the Simulation Region command to create a reusable region that you can use to define boundary conditions, such as glue and contact definitions. A region is a collection of homogenous entities, such as polygon faces. You can then use a region to define the source faces or target faces in boundary condition definitions. For example, you can create a region and then use that region as the Source Region in a Surface-to-Surface Contact definition and a target region in a Surface-to-Surface Glue definition.

When you export or solve your model, the software writes out a single instance of the region to your solver input file, even if that region is referenced by multiple boundary conditions, such as glue or contact definitions.

Regions are managed in the Simulation Navigator

After you create a region, the software stores it in the Regions node in the Simulation Navigator. The Regions node is available when a Simulation file is displayed.

Regions
1 – Top Bracket Inside Faces
2 – Top Bracket Outside Faces
3 – Bottom Bracket Faces
4 – Outside Edges of Bottom Bracket

In the Simulation Navigator, you can:

• Select a region to highlight the entities that belong to that region in the graphics window.

• Right-click a region in the Simulation Navigator to rename, edit, or delete it, or to view information about that region.

Regions are solver specific

The type of region that are available are solver specific, for example, regions of type Void Region are only available in Multiphysics and Thermal/Flow environments.

When you export or solve your model, the syntax the software uses to write a region out to your solver input file depends upon the specified solver for the active solution.

Solver	Corresponding solver syntax
Simcenter Nastran	The corresponding bulk data entry depends on the type of entities used to define the Simulation Region:A BSURF bulk data entry if the region is comprised of 2D elements.A BSURFS bulk data entry if the region is comprised of the faces of 3D elements.A BEDGE bulk data entry if the region is comprised of edges.*
MSC Nastran	BCBODY1 bulk data entryBSURF bulk data entry
Abaqus	*SURFACE keyword
ANSYS	ESURF command or CMBLOCK coded database file commandFor more information, see Creating simulation regions in the ANSYS environment and the Programmer's Manual for ANSYS.
LS-DYNA	*DATABASE_CROSS_SECTION_PLANE, *PART, *SET_NODE, *SET_PART, *SET_SHELL
Simcenter Samcef	.SEL group command.

*In some cases, you may want to have the software use the legacy BLSEG entry when you export or solve a model that contains an edge region, for example, if you are running an earlier version of the solver (NX Nastran 8.0 or earlier) with NX 8.5. If you select the Legacy Edge Region customer default, the software uses the BLSEG entry rather than the BEDGE entry for edge regions.

Regions can also include certain parameters

For Simcenter Nastran, MSC Nastran, and Abaqus solutions, you can also use the Simulation Region dialog box to assign a set of parameters to the entire region.

• With Simcenter Nastran solutions, you can specify certain fields from the BCRPARA bulk data entry to apply to the region. For example, if the region is comprised of 2D elements, you can use the Surface option to specify the contact side of the shells.

• With MSC Nastran solutions, you can specify certain fields from the BCBODY1 bulk data entry to apply to the region. You can also specify a Contact Body Parameters modeling object to define the structural and thermal properties of the contact body. The options in the Contact Body Parameters dialog box correspond to the fields on the BCBDPRP bulk data entry.

• With Abaqus solutions, you can specify certain parameters for the *RIGID BODY keyword.

Where do I find it?

Application	Pre/Post
Command Finder	Simulation Region

Learn more

Automatic face pairing

Creating simulation regions in the ANSYS environment

Creating cross section regions (LS-DYNA)

Creating cross section regions (LS-DYNA)

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Working with reusable regions, Simcenter 3D 2021.1 Series

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