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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.
Global Tools
Global tools are designed for work on larger portions of the model as opposed to individual faces, edges, and vertices.
Projecting Vertices
This tool moves the selected vertex or vertices to a new location using one of five modes.
Projecting Vertices To A Surface
The Project to a Surface mode projects one or more vertices to a set of faces.

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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.
    - Projecting Vertices
      This tool moves the selected vertex or vertices to a new location using one of five modes.
      - Projecting Vertices to a Plane
        The Project to a Plane mode projects selected vertices by the shortest distance to an imaginary plane.
      - Projecting Vertices To A Line
        The Project to a Line mode projects vertices by the shortest distance to an imaginary line.
      - Projecting Vertices In A Coordinate System
        The Project in a Coordinate System mode projects vertices to a single or double ordinate location in a given coordinate system.
      - Projecting Vertices To A Surface
        The Project to a Surface mode projects one or more vertices to a set of faces.
      - Projecting Vertices To An Edge
        The Project to an Edge mode allows the projection of one or more vertices to the nearest edges.
      - Picking Points To Define A Projection Plane Or Line
        When using the Project to a Plane or Project to a Line modes, you can pick positions in the Graphics window to define points.
    - Transforming Surface Entities
      This tool transforms surface entities (vertices, edges, or faces) in a local coordinate system using one of five modes.
    - Offset Faces/Edges Tool
      The Offset Faces/Edges tool is used to inflate or translate faces or edges.
    - Merge and Imprint Tool
      The Merge/Imprint tool lets you imprint sets of faces and edges onto each other. After imprinting, you can switch to the review mode to identify critical issues that may exist in the contact definition.
    - Offset/Imprint Edges Tool
      The Offset/Imprint selected edges tool allows you to either offset or create edges and curves on the specified target faces. On creation, the edge to face imprinter imprints the new edges onto the destination surface.
    - Intersect/Boolean Faces Tool
      The Intersect/Boolean Selected Faces tool allows you to intersect or perform Boolean operations on two face sets. As the tool only operates on triangles faces, any quad faces in the input sets are decomposed to triangles.
    - Edit Connected Surfaces Tool
      The Edit Connected Surfaces tool identifies the connection or disconnection between tessellated surfaces, and allows deletion of disconnected surfaces.
    - Reviewing Volume Topology
      The volume topology tool is a model topology diagnostic tool for analyzing volumes, faces, and edges. In particular, the tool identifies closed volumes from the set of surfaces supplied.
  - 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.

Projecting Vertices To A Surface

The Project to a Surface mode projects one or more vertices to a set of faces.

The Project Vertices button is only available if at least one vertex and one face have been selected for projection. By default, the tool projects using the shortest distance. However, projection in a specified direction is also possible. If projecting in a specified direction with two independent sets of faces selected, the tool projects to the nearest face, regardless of whether it is in the positive or negative direction. In all instances, the tool ignores vertices that belong to the selected surface.

The image below shows the default Project to a Surface mode. As you can see, projection using the shortest distance does not require a coordinate system.

If you select Specified Direction for Projection Method, the Coordinate System menu becomes available, along with the projection Direction.

First select the Coordinate System.
Selecting the coordinate system (Cartesian, Cylindrical, or Spherical) updates the Direction menu with the appropriate coordinate directions.
The projection is performed when you click Project Vertices.

If projection is not possible in the specified direction, the vertex position remains unchanged and the Output window displays a warning message.

Projecting vertices onto a convex surface using the shortest distance method results in “edging”, where projected vertices congregate along the edges of the selected surface. To avoid this effect, project along a specified direction instead.

The following example projects vertices to a surface. The tool projects vertices on the inner surface of a sleeve onto the inner pipe surface, using the shortest distance method.

First, select the vertices on the sleeve inner surface, plus the faces on the pipe outer surface:
In the Projection Options panel, set Projection Mode to Project to a Surface mode.
The projection is performed when you click Project Vertices.

The Graphics window displays the new result:

The tool maintains the original vertex and face selections, so you can repeat the projection with alternative settings.