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Pre-Processing
Simcenter STAR-CCM+ solves physics problems on a computational mesh. To provide this mesh, you first define geometry using internal or external tools, and then create a mesh pipeline whose operations generate the mesh in repeatable steps.
Modeling Geometry
This part of the User Guide describes how to use 3D-CAD, the parametric solid modeler available within Simcenter STAR-CCM+. It also describes the features and tools available for further preparation of the geometry model and its surfaces.
Part Contacts
Part contacts define the connection between two part surfaces. The meshers aim to generate a conformal mesh at the contact, which then becomes an interface in the physics region.
Baffle Contact
A baffle contact is a zero-thickness surface that the meshers maintain in the surface and volume meshes.
Baffle Contact Properties

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Pre-Processing
Simcenter STAR-CCM+ solves physics problems on a computational mesh. To provide this mesh, you first define geometry using internal or external tools, and then create a mesh pipeline whose operations generate the mesh in repeatable steps.
- 3D-CAD
  3D-CAD is a feature-based parametric modeler within Simcenter STAR-CCM+ that allows you to build geometries from scratch. The geometries that you create with 3D-CAD are stored as 3D-CAD models, which you can then convert to geometry parts for integration with the meshing and simulation process.
- Modeling Geometry
  This part of the User Guide describes how to use 3D-CAD, the parametric solid modeler available within Simcenter STAR-CCM+. It also describes the features and tools available for further preparation of the geometry model and its surfaces.
  - Preparing the Geometry
    In general, a Simcenter STAR-CCM+ analysis requires one or more geometry parts from which you define the spatial construction of the regions. Simcenter STAR-CCM+ allows you to create geometry parts directly using the built-in 3D-CAD modeler, or import geometry from a wide range of source formats.
  - Importing Geometry
    One of the possible starting points for the meshing process is to import surface data.
  - Understanding Geometry Parts
    You can use the geometry parts manager node to control what parts are meshed and included in the simulation downstream.
  - Manipulating Parts
    Simcenter STAR-CCM+ allows leaf-level parts to be manipulated in several different ways once they have been imported or created.
  - Part Contacts
    Part contacts define the connection between two part surfaces. The meshers aim to generate a conformal mesh at the contact, which then becomes an interface in the physics region.
    - Part Contacts Properties and Context Menus
      The Contacts manager node and the part contact subnodes provide several properties and right-click actions that allow you to check and edit the connections between parts.
    - Creating Part Contacts
      Use mesh contacts to define a connection between two part surfaces.
    - In-Place Contact
      An in-place contact is a direct connection between two part surfaces.
    - Periodic Contact
      A periodic contact defines two part surfaces that are spatially detached, but a rotation and/or translation can make them coincident.
    - Baffle Contact
      A baffle contact is a zero-thickness surface that the meshers maintain in the surface and volume meshes.
      - Baffle Contact Properties
  - Repairing CAD Geometry
    The Geometry Repair tool provides diagnostic checks for assessing the validity of geometry and the means to repair the geometry automatically.
  - Displaying the Geometry
- The Surface Repair Tool
  The Surface Repair tool diagnoses errors in, and provides repair tools for, tessellated surfaces and part curves. The same tool allows you to reorganize discretized geometry by searching for face-based features and attributes then assigning the results to new or existing part surfaces or curves.
- Defining the Regions Layout
  An essential part of the process in setting up your simulation is to define the relationship between geometry parts and regions, boundaries, and interfaces.
- Meshing
  A mesh is a discretized representation of a geometric domain. This domain can include real-world geometry, its content, and its surrounding environment.

Baffle Contact Properties

The following table summarizes the properties that are available for baffle contacts.


Part Surface 1	The read-only names of the part surfaces that are in contact.
Part Surface 2
Conformality	Read-only property that indicates whether a contact is conformal or non-conformal.
Tags	Applies a user-defined tag so that you can organize mesh contacts.
Interface	Displays the interface associated with the part surface contact when the parts are assigned to regions.
Metadata	Specifies the information that you can use to filter the mesh contacts, which are based on properties that are unrelated to the Simcenter STAR-CCM+ simulation.
Show baffle proxy surface	Activating this property shows the duplicated surface that defines the other side of zero-thickness baffle. This proxy surface is not required for meshing, but is required for modeling physics. This property also allows you to specify the positive direction of the baffle using the Baffle Orientation Point node.
Index	Index reference for the part surface contact (read only). This index is available through the Part Surface Contact Index field function.

Baffle Orientation Point Properties

The following table summarizes the properties that are available for the Baffle Orientation Point node.


Orientation Point	Specifies a point to which the original baffle surface points to (this is considered the 'outside' — the other side (the 'inside') is the proxy surface. When you assign the part to a region, the original surface becomes a boundary and the proxy surface becomes a copy of that boundary. If you are generating prism layers on the baffle, it is useful to know that prism layers are generated on both sides of the baffle by default. The orientation point is on the 'inside' with respect to the proxy surface, and 'outside' with respect to the original surface. Consequently, prism layers for the original surface appear on the opposite side of the orientation point, and prism layers for the proxy surface appear on the same side of the orientation point.
Coordinate System	Specifies the coordinate system to which all other properties of this node are relative.