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Geometry Modeling
Manage CAD, FE, and 2D parametric sketch geometry.
Geometry
Create, edit, and cleanup geometry.
Create Geometry
Explore the tools used to create geometry.
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.

Welcome
What's New
View new features for HyperMesh CFD 2025.
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 Modeling
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.
    - 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 Bounding Solids
        Use the Solids: Bounding tool to create solids from enclosed surface volumes.
      - Create Spheres
        Use the Solids: Sphere tool to create spheres with solid or bounding surfaces.
      - Create Boxes
        Use the Solids: Box tool to create tunnels for external flow or body-fitted boxes around selected surfaces.
      - Create Cylinders
        Use the Solids: Cylinder tool to create cylinders with solid or bounding surfaces.
    - 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.
Automation
Automate simulation processes with templates and utility scripts.
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.
Solver Help
More resources for AcuSolve and ultraFluidX solvers.

View All Altair HyperWorks Help

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.

The surfaces defining a solid can belong to multiple component collectors. The display of a solid and its bounding surfaces are controlled only by the component collector to which the solid belongs.

Bounding Surface: A bounding surface defines the outer boundary of a single solid.; Bounding surfaces are shaded green by default.; A bounding surface is unique and is not shared with any other solid. A single solid volume is defined entirely by bounding surfaces.
Fin Surface: A fin surface has the same solid on all sides, that is, it acts as a fin inside of a single solid.; Fin surfaces are shaded red by default.; A fin surface can be created when manually merging solids or when creating solids with internal fin surfaces.
Full Partition Surface: A full partition surface defines a shared boundary between one or more solids.; Full partition surfaces are shaded yellow by default.; A full partition surface can be created when splitting a solid or when using Boolean operations to join multiple solids at shared or intersecting locations.

Figure 1.