Home
Setup
Prepare your model and run the simulation.
General Setup
Prepare your model for a general AcuSolve simulation.
Motion
Define direct, derived, and constrained mesh motion.
Direct Motion
Define explicit motion or motion sources on solids or surfaces.
Define Rotational Motion
Use Rotation tool to define mesh rotation on solid bodies or surfaces.

Welcome
What's New
View new features for HyperMesh CFD 2024.1.
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 Modeling
Manage CAD, FE, and 2D parametric sketch geometry.
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.
- General Setup
  Prepare your model for a general AcuSolve simulation.
  - Flow
    Set up the simulation model, materials, domains, and boundaries.
  - Radiation
    Define radiation conditions and create emissivity models.
  - Motion
    Define direct, derived, and constrained mesh motion.
    - Set Up Mesh Motion
      Use the Settings tool to define the mesh motion equation to be solved.
    - Direct Motion
      Define explicit motion or motion sources on solids or surfaces.
      - Define Translation Motion
        Use Translation tool to define linear mesh translation on solid bodies or surfaces.
      - Define Rotational Motion
        Use Rotation tool to define mesh rotation on solid bodies or surfaces.
      - Define Rigid Body Motion
        Use the Rigid Body tool to simulate the dynamic motion of a body under the influence of forces and moments.
      - Define Advanced Motion
        Use the Advanced tool to define motion based on the position of two reference points at different times. This is useful when you want to define arbitrary motion with time.
      - Define Advanced Spatial Motion
        Use the Advanced Spatial tool to define nodal motion conditions. This is useful to define mesh displacement and/or mesh velocities along with other motion. It can be used to simulate a train moving through tunnel, a car changing lanes, food injection, and so on.
    - Derived Motion
      Define how to interpolate the effect of the motion created with the Direct tools.
    - Constraints
      Define how the nodes will move around certain surfaces.
  - Solution
    Define output conditions, run the simulation, and view the results.
  - AcuTrace
    AcuTrace is particle tracer that runs as a post-processor to AcuSolve.
- Aerodynamic and Aeroacoustic Setup
  Prepare your model for wind tunnel analysis using ultraFluidX.
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

Define Rotational Motion

Use Rotation tool to define mesh rotation on solid bodies or surfaces.

From the Motion ribbon, click the Rotation tool.

Figure 1.
Select surfaces and/or solids.
Use the guide bar selectors to filter which entity type you can select.
Click Axis on the guide bar.
Left-click to position the axis of rotation in the modeling window.

Tip: Use snap points to position the axis on existing points, lines, surface centers, and so on.
Use the options in the microdialog to further align the axis.
- Click to flip the rotation direction.
- Click X, Y, or Z to align to the global axes.
- Click to position the axis using the Vector tool. Once the position is defined, press Esc to return to the current tool.
- Click to enter axis and rotation center coordinates.

In the microdialog, select a motion definition type then define the motion.

Option	Description
Constant	Define a constant velocity.
Time Varying	Click . In the dialog, define a basis for motion variation, a motion input, and a data interpolation type. Use the table and the plot area to create a data set. Exit the dialog.
Sinusoidal	Click . In the dialog, define a motion input. Enter values for frequency, phase, and amplitude. Exit the dialog.
Hybrid	This option allows you to start with an MRF and then enable mesh motion after a certain amount of time steps. Before defining hybrid motion here, you should: In the Flow ribbon, Physics tool, set time marching to Transient and define a time step size In the Motion ribbon, Settings tool, set the mesh motion type to Specified or Arbitrary. Now, returning to the Rotation tool: Click . In the dialog, define the required speed (radian/sec). Select time/time step as the specification method and add rows to define the MRF fraction at each time step. An MRF fraction of 1 means rotation is simulated completely by the MRF. An MRF fraction of 0.4 means: 40% MRF and 60% Mesh motion. A 0 MRF fraction means rotation is simulated by sliding mesh motion. Click to automatically populate suitable time increments based on the MRF fraction. Exit the dialog.

From the guide bar, execute the command in the following ways:
- Click to confirm your selection and remain in the tool.
  This allows you to continue creating instances and helps you visualize and edit instances with the legend.
- Click to confirm your selection and exit the tool.