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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.
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.

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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.
    - The Slide Out Panel
      The slide out panel, located on the right-hand side of the Graphics window, contains the diagnostics and search options of the Surface Repair tool.
  - 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.
  - 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.

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.

The different modes of the Surface Repair tool are contained within the panel on the left of the screen. Some tools contain options, and these are displayed in the bottom half of the panel.

Note	To prevent accidental closure of the Surface Repair tool when repair operations are in progress, Simcenter STAR-CCM+ temporarily deactivates the Close button. The Close button is available again when the repair operations are complete or after you click (abort).

Coordinate systems that you create in the Simcenter STAR-CCM+ object tree while the repair session is active are automatically included in tools that use a coordinate system selection.

For a list of tools that are located in the panel, see Global Tools and Repair Tools Reference.

Features that are common to all modes of the Surface Repair tool are embedded in the Graphics window.

For a list of the embedded tools see Embedded Tools Reference.

Part of the embedded tools include the selection filters. See Filtering Selection Entities.

On the right-hand side, there is a slide out panel that contains the diagnostics for surfaces and part curves, as well as the search functionality to help organize and group related part surfaces together. See Organizing Discretized Geometry.

Displaying Tool Options

Tool options are indicated by three dots next to the tool icon . By default, the options for each tool are hidden and appear after you activate the tool.

To display the tool-specific options:

Click the three dots next to the tool icon.

Note The icon consists of two parts, the three dots and the actual tool. Clicking on the tool portion of the icon executes the tool function.

The options appear in the bottom half of the repair panel.

The three dots change from black to white to indicate that the options for the specified tool are displayed. You can use other tools while the options of another tool are displayed.