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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.
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.
Part Controls
The Organize tab allows you to create or reassign part entities using the Part Edit or Create New Part options.
Assigning Faces to a Target Part Surface Contact
Within the Part Edit group box, you can use the Part Surface Contact option to assign faces to existing part surface contacts. This feature is useful in situations where you use surface repair tools for creating faces that belong to a contact.

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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.
- 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.
  - The Surface Repair Workflow
    Use the Surface Repair tool to identify and manually repair surface and part curve errors on the discretized geometry.
  - Surface Repair User Interface
    The functions of the Surface Repair tool are contained within the Surface Repair environment. Repair tool modes are presented in the Surface Repair panel; display, selection, and diagnostics/search functions are embedded within the Graphics window.
  - Selecting Entities
    The surface repair tool allows you to select faces based on either individual triangles from the tessellation or underlying patch definitions in the CAD geometry. A number of methods are available for making rapid selections based on continuity and proximity.
  - Repairing Surfaces
    Diagnose and fix surfaces before running the surface remesher.
  - Repairing Features
    Diagnose and fix part curves before running the surface remesher.
  - Surface Repair Error Categories
    The Surface Repair tool diagnoses the geometry for surface and feature errors and groups the various errors into color-coded categories.
  - Repair Tools Reference
    Use the repair tools to repair errors on the geometry surface and part curves.
  - Global Tools
    Global tools are designed for work on larger portions of the model as opposed to individual faces, edges, and vertices.
  - Query Tools
    Query tools provide information on selected entities in the Graphics window.
  - Classifying Surfaces
    In many cases, different surfaces of a geometry part require different mesh settings, for example, a different number of prism layers for internal and external surfaces. In Surface Repair, you can Classify faces based on specified criteria and create corresponding part surfaces. This classification process is suitable for regular geometries with well defined angles.
  - Organizing Discretized Geometry
    The search capability of the Surface Repair tool is a powerful feature that helps you organise and prepare discretized geometry for simulation.
  - Tagging Surfaces in Surface Repair
    You can tag selected surfaces in the Surface Repair Tool. You can manually select surfaces for tagging, or tag the surfaces returned by the search filters.
  - Part Controls
    The Organize tab allows you to create or reassign part entities using the Part Edit or Create New Part options.
    - Creating New Part Entities in Surface Repair
      You can create a new part entity (surface, curve, or point) within the Surface Repair tool.
    - Assigning Part Entities to Target Part Entities
      All part entities (faces, edges, and vertices) in a part belong to a part surface/curve/point by default. This tool assigns selected part entities to an existing surface/curve/point.
    - Assigning Faces to a Target Part Surface Contact
      Within the Part Edit group box, you can use the Part Surface Contact option to assign faces to existing part surface contacts. This feature is useful in situations where you use surface repair tools for creating faces that belong to a contact.
    - Creating a New Part During Surface Repair
      You can create as many new empty parts as you want within the Surface Repair tool. You can create the new part at anytime during the repair or leak detection session.
    - Modifying Part Entities Using the Right-Click Menu
      In addition to using the Part Edit group box to modify part entities, you can modify part entities directly using the right-click menu.
  - Set Controls
    A set is a collection of faces, edges, or vertices, which you can store, recall and browse, using the Set Controls group box.
  - Query Diagnostic Responses From Java Macros
    This section provides example Java and reference material for accessing information from surface preparation query diagnostics.
  - Surface Repair Hotkeys
    Hotkeys, also known as keyboard shortcuts, execute surface repair operations using the keyboard instead of the user interface.
  - Pop Up Menu of the Surface Repair Tool Graphics Window
    The following pop-up menu items are available when you right-click a part or part surface in the Graphics window, while using the Surface Repair tool.
- 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.

Assigning Faces to a Target Part Surface Contact

Within the Part Edit group box, you can use the Part Surface Contact option to assign faces to existing part surface contacts. This feature is useful in situations where you use surface repair tools for creating faces that belong to a contact.

In the Graphics window, select the faces which you want to add to the target part surface contact using the appropriate selection filter.

In the Part Edit group box, select Part Surface Contact.

Note	Only contacts that exist between the parts that are in the current surface repair mode are available. You cannot create a new contact using this tool. To create a new contact, return to the simulation tree. See Creating Part Contacts Manually.

Click and select the target part surface contact from the Select Object dialog.
In the Part Edit group box, click Modify.

The selected faces are added to the target part surface contact. However:

If the selected faces belong to a contact that is different from the target contact, the following warning is displayed in the Output window:

Warning -- some faces were moved out of part contacts.
The faces that are added to the target part surface contact using this tool are assigned to a separate patch from those faces that already belong to the target part surface contact.