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Geometry Repair
Manage CAD, FE, and 2D parametric sketch geometry.
Geometry
Create, edit, and cleanup geometry.
Create Geometry
Explore the tools used to create geometry.
Surfaces
A surface represents the geometry associated with a physical part. A surface is a two-dimensional geometric entity that may be used in automatic mesh generation.
Extend Surfaces
Use the Surfaces: Extend tool to create tangent or normal extension surfaces.

Welcome
What's New
View new features for HyperMesh CFD 2025.1.
Get Started
Learn the basics and discover the workspace.
Onboarding Resources
Discover HyperMesh CFD functionality with interactive tutorials and community resources.
Solution Layers
Solution-centric workflows allow you to traverse through modeling environments using a dedicated UI layer.
Manage Files and Data
Create, open, import, and save models.
Convert
Use the Convert tool to convert entire models between data types.
Geometry Repair
Manage CAD, FE, and 2D parametric sketch geometry.
- Sketching
  Create and edit 2D parametric sketch geometry.
- Geometry
  Create, edit, and cleanup geometry.
  - Repair Geometry
    Review geometric errors in the model's surfaces and solids and fix any defects.
  - Create Geometry
    Explore the tools used to create geometry.
    - Points and Nodes
      Learn about creating, editing, and extracting points and nodes.
    - Lines
      A line represents a curve in space and is not attached to any surface or solid. A line is a one-dimensional geometric entity.
    - Midlines
      Use the Midlines tool to create midlines from existing lines, surface edges, or tube solids.
    - Shapes
      Create and edit circles and rectangles with the Shapes tool.
    - Surfaces
      A surface represents the geometry associated with a physical part. A surface is a two-dimensional geometric entity that may be used in automatic mesh generation.
      - Patch and Delete Surfaces
        Use the Surfaces: Patch tool to create patch surfaces between free lines that are not connected or surface edges. You can also delete surfaces with this tool.
      - Extend Surfaces
        Use the Surfaces: Extend tool to create tangent or normal extension surfaces.
      - Cross Extend Surfaces
        Use the Surfaces: Cross Extend tool to extend surfaces to meet each other, or other target surfaces.
    - Solids
      Solids are closed volume of surfaces that can take any shape. Solids are three-dimensional entities that can be used in automatic tetra and solid meshing.
    - Create Revolve Regions
      Use the Revolve tool to create axisymmetric revolved regions around select solid bodies. This is useful for creating regions around rotating bodies like fans, impellers, wheels, and so on.
    - Extract Midsurfaces
      Use the Midsurfaces tool to extract the midsurface of sheet metal stampings, molded plastic parts with ribs, and other parts that have thickness clearly smaller than width and length.
    - Extrude Geometry
      Extrude surfaces, nodes, or lines along their normal direction, a vector, or another line.
    - Create Ruled Surfaces and Solids
      Use the Ruled tools to create surfaces/solids by interpolating lines and surfaces either linearly or smoothly.
  - Edit Geometry
    Explore the tools used to edit geometry.
  - Geometry Cleanup
    Clean up problematic areas on geometry.
  - Simplify Region
    Use the Simplify Region tool to create simple shapes around selected geometry.
- Discrete Geometry
  Work with discrete geometry like FE Geometry and floating elements.
- Model Build and Assembly
  Create, organize and manage parts and subsystems.
Meshing
Generate surface/volume mesh by defining mesh controls, or interactively create and edit 2D surface mesh.
Setup
Prepare your model and run the simulation.
Post-Processing
Post-process the simulation results by creating visualizations and measurements.
Design Exploration
Once the baseline model is prepared, you can define morph volumes, morph geometry, create design shapes and run DOE studies. These tool work for both AcuSolve and ultraFluidX-based workflows.
Automation
Automate simulation processes with templates and utility scripts.
Solver Help
More resources for AcuSolve and ultraFluidX solvers.

Extend Surfaces

Use the Surfaces: Extend tool to create tangent or normal extension surfaces.

New surfaces are organized in the same component as the surface being extended.

From the 2D ribbon, click the Surfaces > Extend tool.

Figure 1.
Select edge(s).
Click an arrow to switch between creating a tangent or normal extension surface.
If an edge has multiple adjacent surfaces, use Tab to cycle between them.
Optional: Select one or both of the extend options in the microdialog.
- Click to maintain edge angles.
- Click to auto-trim intersecting surfaces.
Extend surfaces in the following ways:
- Enter a length in the microdialog and press Enter.
- Drag the arrow in the modeling window.

Tip: Constrain line drag to one direction, then use snap points to extend surfaces by distances relative to existing geometry, even if the reference points are not on the same plane as the surface being extended.