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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.
3D-CAD Geometry Modeling
Bodies represent the individual objects that make up the 3D-CAD model. Imported CAD geometry appears as bodies in 3D-CAD, and you can also create your own bodies directly using 3D-CAD features.
Working with Bodies
In 3D-CAD, a body is a single object, formed from a series of operations and features.
Overview of Bodies in 3D CAD
Hiding Bodies
The hide feature allows you to hide bodies temporarily from the 3D-CAD View scene.

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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.
  - 3D-CAD Environment
    The 3D-CAD environment provides you with a feature tree from which you can activate all steps for creating and modifying geometry, and a 3D-CAD View scene in which you interact with the geometry. Many of the same feature actions are available for selection in the 3D-CAD View scene.
  - Sketches in 3D-CAD
    3D-CAD supports two types of sketch—2D sketches that are created on a planar surface and 3D sketches that are built from points located anywhere in geometric space. You can use both types of sketch in 3D geometry operations such as extrude, revolve, or sweep.
  - 3D-CAD Geometry Modeling
    Bodies represent the individual objects that make up the 3D-CAD model. Imported CAD geometry appears as bodies in 3D-CAD, and you can also create your own bodies directly using 3D-CAD features.
    - Working with Bodies
      In 3D-CAD, a body is a single object, formed from a series of operations and features.
      - Overview of Bodies in 3D CAD
        Controlling how Bodies are Organised in the 3D-CAD Tree
        By default, bodies in 3D-CAD are organised in a tree structure—that is, bodies are nested under other bodies using body groups. You can choose to display all bodies in a flat structure.
        Deleting Bodies and Body Groups
        When you delete a body, it is removed from the 3D-CAD model, and a corresponding DeleteBody feature node is added to the feature tree. Similarly, you can delete Body Groups.
        Hiding Bodies
        The hide feature allows you to hide bodies temporarily from the 3D-CAD View scene.
        Duplicating Body Groups
        When you duplicate a body group, you can choose whether to include the hierarchy (structure) within the duplicate and also whether to place the duplicate at the same level or at the root level.
        Duplicating a Body
      - Creating Sheet Bodies from Solid Bodies
      - Sewing Sheet Bodies Together
        When the free edge of a sheet body coincides with the free edge of an adjacent sheet body, Simcenter STAR-CCM+ can sew the edges together to form a single sheet body. Similarly, if multiple edges on the same sheet body overlap, Simcenter STAR-CCM+ can merge them with the Sew function.
      - Shelling a Body
        The Shell tool converts a solid body into a thin-walled, hollow, solid body.
      - Creating Bounding Bodies
        In 3D-CAD, you can simplify a complex geometry by replacing detailed bodies with bounding bodies. For example, on a circuit board you can create bounding bodies to replace detailed parts such as the capacitors, resistors or other components.
      - Converting Mesh Data to CAD
        In many cases, geometric information is provided in the form of mesh data. To make changes to the mesh data in Simcenter STAR-CCM+, you first convert the data into a precise CAD geometry.
      - Thickening a Body or a Face
        Use the thicken operation to create a solid body by either thickening a sheet body by a specified amount, or by thickening a specific face on a solid body to create a separate solid body.
      - Transforming a Body
        In 3D-CAD, you can perform transformations on both BRep and facet bodies. Typical transformations include translations, rotations, reflections, scaling, and coordinate system transforms.
      - Performing Boolean Operations
      - Imprinting Sketches Onto Bodies and Faces
        You can split a surface of a face or body by imprinting a 2D or 3D sketch onto it. You can perform the sketch imprint on a CAD body or face as well as a faceted body or face.
      - Working with Linear Patterns
        The linear pattern tool is used to reproduce a series of identical bodies, from seed bodies, which follow a regular formation along straight lines.
      - Working with Circular Patterns
        The circular pattern tool is used to reproduce a series of identical bodies, from seed bodies which follow a regular formation around a circle.
      - Creating Fillets
        A fillet is a feature that rounds-off the edge, or corner, of a body by replacing it with a smooth curve of constant or variable radius.
      - What Is a Chamfer?
        A chamfer is a feature that makes a straight cut across the corner of a body, resulting in a flat surface.
      - Multi-Body Instancing
        In Simcenter STAR-CCM+, you can import CAD models that include multiple instances of the same body. You can apply changes to all instances at the same time by modifying a single instance, which acts as a reference to all other instances.
    - Creating Bodies From Profiles
      In 3D-CAD, you create bodies by extruding, revolving, lofting, or sweeping profiles. Once a body is created, you add or remove material from it.
    - Working with Reference Geometry in 3D-CAD
      Reference geometry helps you construct models in 3D-CAD. You can also use reference geometry in downstream applications, such as FEA.
    - Working with Faces, Edges, and Vertices
      In 3D-CAD, vertices define edges, edges, define faces, and faces define bodies. These entities define the surfaces and curves in a geometry part, and the boundaries within a region.
    - Creating and Visualizing Contacts
      A contact defines the connection between two surfaces. Simcenter STAR-CCM+ allows you to define contacts directly in 3D-CAD. Face contacts in the 3D-CAD model become contacts between part surfaces, and, ultimately, can form interfaces in the physics regions.
    - Selecting Hidden and Obscured Objects in 3D-CAD
      Use the depth selector to view and select objects which are hidden or otherwise obscured by other objects in the graphics window.
    - The Turbo Slicing Tool
      In turbomachinery simulations, the repeat periodic nature of the geometry allows you to model flow through a single blade passage only. To create the fluid volume for a single blade passage, you must cut the blade passage out of the whole domain volume using surfaces that pass between adjacent blades. The Turbo Slicing tool computes these neutral surfaces for you.
  - Freeform Surface Modeling
    Freeform surface modeling is a modeling technique in 3D-CAD that allows you to deform existing surfaces for desired shapes.
  - Importing and Exporting Geometry
  - Working with 3D-CAD Models
  - Geometry Repair and Preparation
    Simcenter STAR-CCM+ provides a suite of tools in 3D-CAD that helps you to prepare your CAD geometry so that it is suitable for meshing. CAD that is designed for manufacture can have gaps or inaccuracies that cause problems when trying to generate a watertight mesh.
  - Design Parameters
    Design parameters allow Simcenter STAR-CCM+ to update geometry designs during design exploration studies. Although you define them within the 3D-CAD environment, they are exposed outside 3D-CAD for manual or automatic update.
- 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.
- 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.

Hiding Bodies

The hide feature allows you to hide bodies temporarily from the 3D-CAD View scene.

You can also hide bodies while performing a CAD operation. This function is useful for gaining a clear view of other CAD components. You can restore hidden bodies again by using the show feature. If you want to hide a particular face on a body, use the hide face action. See Hiding Faces.

Hiding a Body

To hide a body:

Right-click the body from within the Body Groups manager node and select Hide. You can select multiple bodies by holding down the <Ctrl> key.
Alternatively, right-click the body in the 3D-CAD View scene and select Body > Hide Body.

In the feature tree, you can identify hidden bodies by the grayed out icon, for example for a solid body. When hiding a body group, all bodies contained within the body group are hidden.

To hide all bodies other than the selected ones:

Right-click the body from the Body Groups manager node and select Show Only.
Alternatively, right-click the body in the 3D-CAD View scene and select Body > Show Only.

All bodies, other than those selected, are hidden. If you choose to show only a body that is already hidden, the operation shows this body and hides all other bodies.

Restoring a Body

To restore a body:

Right-click the body from within the Body Groups manager node and select Show. You can select multiple bodies by holding the <Ctrl> key.
Alternatively, while performing a CAD operation in Edit mode, right-click a blank area in the 3D-CAD View scene and select Restore Hidden Bodies.

When you restore a hidden body in the 3D-CAD View scene, the body icon returns to normal, for example for a solid body. When restoring a body group, all bodies contained within the body group are restored.