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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.
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.
What Is a Design Parameter?
A design parameter is a reference variable that you can use to define model dimensions and feature sizes.

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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.
  - 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.
    - What Is a Design Parameter?
      A design parameter is a reference variable that you can use to define model dimensions and feature sizes.
    - Creating a New Design Parameter
      Parametric modeling allows you to create designs in 3D-CAD that can be easily altered afterwards.
    - Exposing a Parameter
      You can expose an existing dimension as a design parameter and rename this parameter. Use this technique if you want to control a model dimension without editing the corresponding feature directly, or if you want to define other variables in terms of the selected dimension.
    - Using Design Parameters in an Expression
    - Changing the Value of a Design Parameter
    - Deleting a Design Parameter
- 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.

What Is a Design Parameter?

A design parameter is a reference variable that you can use to define model dimensions and feature sizes.

Each design parameter has a name and a value. When you enter this name into a dimension dialog (prepended by a dollar sign, $), for example, the dimension is set to the corresponding value of the design parameter. Design parameters are versatile, and you can use them to form larger expressions. Another benefit of using design parameters is that they allow you to change feature values from outside of 3D-CAD.

The icons for user-defined design parameters are colored in black. The icons for interval parameters are colored in blue.

There are 8 types of design parameter:

Length — defined in one of the standard units of length
Angle — defined in either degrees (deg) or radians (radian)
Generic — defines a dimensionless quantity
Vector — defines a quantity that has both direction and magnitude
Lab Coordinate — defines a coordinate system
Generic Interval — defines dimensionless maximum and minimum values
Length Interval — defines the maximum and minimum length values
Angle Interval — defines the maximum and minimum angle values

You can either expose existing dimensions as design parameters or else create new design parameters directly.