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Geometry Modeling
Manage CAD, FE, and 2D parametric sketch geometry.
Sketching
Create and edit 2D parametric sketch geometry.
Introduction to Sketching
Learn about sketching basics including the sketch plane, legend, constraints, context menu options, and construction geometry.
Sketch Units
All sketch data and parameter entities are handled according to the current unit system. All dimension values, variable manager values, and sketch entity data like line length, circle radius, or point position are appended with the current units system.

Welcome
What's New
View new features for HyperMesh CFD 2024.
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.
  - Introduction to Sketching
    Learn about sketching basics including the sketch plane, legend, constraints, context menu options, and construction geometry.
    - Sketch Plane
      Select a sketch tool, then select a sketch plane to begin sketching.
    - Sketch Legend
      The Sketch Legend in the upper left corner of the modeling window indicates whether a sketch entity is Projected or Intersected, and whether a sketch curve is Underdefined, Fully Defined, or Overconstrained.
    - Sketch Constraints
      Apply geometric relationships such as tangency and perpendicularity to sketch curves.
    - Sketch Context Menu Options
      Create a sketch imprint, remove constraints, align axes, convert sketches to construction geometry, and show or hide grids, points, constraints, construction lines, dimensions, or intersection curves.
    - Construction Geometry
      Construction geometry is used as a reference to line up or define other geometry.
    - Sketch Units
      All sketch data and parameter entities are handled according to the current unit system. All dimension values, variable manager values, and sketch entity data like line length, circle radius, or point position are appended with the current units system.
  - Variables
    Create and assign variables to parameters when modeling.
  - New Sketch
    Start a new sketch and select a sketch plane.
  - Project
    Project selected geometry onto the sketch plane as construction geometry.
  - Intersect
    Extract curves resulting from the intersection of the sketch plane with selected parts.
  - Point/Lines
    Sketch and edit a point, line, polyline, or line-arc.
  - Rectangles
    Sketch and edit a rectangle.
  - Polygons
    Sketch and edit a parallelogram or a regular polygon.
  - Circles
    Sketch and edit a circle.
  - Ellipses
    Sketch and edit an ellipse or an elliptical arc.
  - Arcs
    Sketch and edit an arc.
  - Splines
    Sketch and edit a spline.
  - Dimension
    Use the Dimension tool to define and/or constrain the dimensions of a sketch.
  - Transform
    Translate or rotate sketch entities.
  - Trim/Break
    Trim or split a sketch curve.
  - Extend
    Extend or shorten an entity of a sketch curve.
  - Fillet
    Round the corners of 2D sketch curves to create fillets with the same radius or different radii.
  - Offset/Mirror
    Offset or mirror a sketch curve.
  - Pattern
    Create a linear or circular pattern of sketch entities.
- Geometry
  Create, edit, and cleanup 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

Sketch Units

All sketch data and parameter entities are handled according to the current unit system. All dimension values, variable manager values, and sketch entity data like line length, circle radius, or point position are appended with the current units system.

The default unit system is MMKS (mm kg N s). Opening or importing previous HM files containing sketch data are interpreted with this default unit system. Unit systems can be changed from Preferences > Sketching > Units.

Note:

When opening/importing CAD data into a session, you need to choose your target units as what is set in the sketching units.
When the sketching unit system is changed, all the sketches and parameter data present in the session are scaled based on the unit system value, including its realized lines and surfaces.
Units can not be changed while sketching is in progress.

Use the Scale sketch data preference option to change the sketch data of your choice with or without scaling the data. Scale sketch data can be changed from Preferences > Sketching > Scale sketch data.

The Scale sketch data option is useful for legacy files, especially when there are no units. Previously, you would use unitless numbers. Now, you can change the units (for example, mm to cms or cms to mms) without scaling the model by selecting the Scale sketch data option.

Note: If you have two models with separate units, it is not recommended or then we do not recommend and support importing mixed units models. Instead, you should bring the models to common units in separate HyperMesh sessions, save the file with consistent units, and then import these models.

Grid Spacing

Grid spacing is interpreted from the values specified and the selected unit system.

HyperMesh CFD has five progressive levels of grid spacing, available in Preferences > Sketching > Grid Spacing. To change the default spacing for a particular grid, enter a value in the text box. Grid spacing for metric and English unit systems are maintained separately.