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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.

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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.
  - 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.

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.

For many simulations in Simcenter STAR-CCM+, the first step involves preparing the geometry of the case under investigation. This geometry could come from a model that was prepared previously in a CAD package, or could be created directly using the 3D-CAD module within Simcenter STAR-CCM+.

3D-CAD

This fully integrated CAD tool allows you to build geometry from scratch within the Simcenter STAR-CCM+ environment, as well as import external CAD models and modify them before running a simulation. 3D-CAD is tailored to suit the needs of a CFD analysis and allows you to change the geometry quickly and easily, before rerunning the simulation.

The chapters in this section covering 3D-CAD are as follows:

Creating geometry with 3D-CAD
Importing geometry into 3D-CAD
Exporting geometry from 3D-CAD
Using 3D-CAD models in a simulation

Preparation of the Geometry Model

The concepts that are associated with manipulating and preparing geometry have been distinguished from the ones that relate to regions and boundaries through the introduction of geometry parts. Geometry parts are contained within the Geometry Parts node of the object tree. They are fully described in the section Using Geometry Parts.

The other parts of the documentation cover the following:

An introduction to using Simcenter STAR-CCM+
How to generate or import meshes and work with them
Modeling physics -- the concepts, theory, and implementation details of the models
Using tools in Simcenter STAR-CCM+ to facilitate your work
Detailed information on interacting with CAD/CAE products in a Simcenter STAR-CCM+ simulation
Examples of applying the models of Simcenter STAR-CCM+ in sophisticated cases
Preparation and procedures for running a Simcenter STAR-CCM+ simulation
Analyzing results through visualization and plotting
A wizard guide that shows how Simcenter STAR-CCM+ features are combined in customized interfaces for special applications
A tutorial guide that shows you how to use Simcenter STAR-CCM+ for various applications in a step-by-step format
A guide to using STAR-View+ , a viewer for three-dimensional Simcenter STAR-CCM+ scenes