Autodesk CFD Ultimate 2023 Free Download

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Autodesk CFD Ultimate 2023 Free Download

What is Autodesk CFD?

Autodesk® CFD software creates computational fluid dynamics simulations that engineers and analysts use to intelligently predict how liquids and gases will perform. With CFD software, you can:

Autodesk CFD Ultimate 2023 Free Download

  • Customize setups with a user-friendly interface
  • Analyze heat transfer and fluid flow design
  • Enable scripting and automation with APIs

Flow control applications

Optimize designs when you need to improve pressure drop or flow distribution

Autodesk CFD Ultimate 2023 Free Download

Thermal prototyping

Solve for all modes of heat transfer, from solid to solid or solid to fluid

Architectural and MEP applications

Improve building efficiency with optimized HVAC design

Autodesk CFD Ultimate 2023 Free Download

Free surface modeling

Simulate interfaces between liquids and gases. Model flow phenomena like waves, sloshing, and spilling

Autodesk CFD Ultimate 2023 Free Download

Motion simulation

Analyze the interaction between solid objects in motion and surrounding fluid

Autodesk CFD Ultimate 2023 Free Download

Humidity and condensation

Model condensation of a liquid from a moist gas

Autodesk CFD Ultimate 2023 Free Download

Solar heating loads

Identify effects of solar heating on energy performance and efficiency of a structure and its spaces

Smoke visibility

Determine smoke patterns as they fill a room to help identify design changes and exit sign placement

Autodesk CFD Ultimate 2023 Free Download

Rotating (turbomachinery)

Analyze rotating devices surrounded by a static (non-rotating) frame of reference

After preparing the CAD model, you are ready to transfer it to Autodesk® CFD. This topic describes how to launch directly from the CAD system. Other topics in this section describe how to start with a CAD file, how to launch from a CAD reader, and how to open a meshed representation of the model.

Autodesk CFD Ultimate 2023 Free Download

By launching directly from the CAD system, you seamlessly push the model directly into Autodesk® CFD. As you introduce design variations, Autodesk® CFD automatically assigns the settings from the original simulation model to the new one. This associativity ensures consistency between your simulations, and reduces the amount of setup time needed for subsequent design iterations.

Autodesk CFD Ultimate 2023 Free Download

When you install Autodesk® CFD, the installer adds an icon or menu to the following CAD systems:

Autodesk® Inventor

Click the Simulation tab, and select the appropriate option from the Autodesk® CFD panel:

Autodesk CFD Ultimate 2023 Free Download

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Autodesk® Revit Onebox, Architecture, and MEP

Click the Add-Ins tab, and select the appropriate option from the Autodesk® CFD panel:

Autodesk CFD Ultimate 2023 Free Download

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  • To launch the visible model into the Model Assessment Toolkit, select Active Model Assessment Tool.
  • To launch only the visible model, select Active Model. This opens the Design Study Manager.
  • Autodesk CFD Ultimate 2023 Free Download

PTC Creo

Click the Tools tab, and select Autodesk® CFD 2019 from theTools drop-down.

Autodesk CFD Ultimate 2023 Free Download

  • To launch the visible model into the Model Assessment Toolkit, select Active Model Assessment Tool.
  • To launch only the visible model, select Launch Active Model. This option opens Autoprep, which is useful for resolving accuracy issues, interferences, and changing the launch method. The model then launches into Autodesk® CFD with the Design Study Manager.
  • To launch the Family table of instances, select Launch Instances. This opens the Design Study Builder. Note that this feature supports only the Granite launch method.
  • To collect parts and surfaces into groups for assigning settings with Rules or in the Design Study Builder, select CAD Entity Groups(For more about CAD Entity Groups…) Note that this feature supports only the Granite launch method.
  • Autodesk CFD Ultimate 2023 Free Download

Solid Works

Click the Autodesk® CFD 2019 tab, and select the appropriate option:

  • To launch the visible model into the Model Assessment Toolkit, select Active Model Assessment Tool.
  • To launch only the visible model, select Active Model. This option opens the Design Study Manager.
  • Autodesk CFD Ultimate 2023 Free Download
  • To study multiple geometric variations, select Multi-Configurations. This option opens the Design Study Builder.
  • To collect parts and surfaces into groups for assigning settings with Rules or in the Design Study Builder, select CAD Entity Groups(For more about CAD Entity Groups…)
  • Autodesk CFD Ultimate 2023 Free Download

UGNX

Click Menu and Autodesk® CFD 2019.

SpaceClaim

Click the Autodesk Simulation tab, and select the appropriate option:

Use Autodesk® Surface Wrap to surface wrap a model, add an external volume, and generate a quality mesh for transfer into Autodesk® CFD. You can easily generate a mesh for CAD models that might otherwise be difficult or impossible to mesh without extensive CAD cleanup. Currently, Surface Wrap meshes are appropriate for external flow analyses or wind tunnel type models.

Note: Surface Wrap does not support 2D models.

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Access Surface Wrap

Import your model into Surface Wrap when you create a new design study:

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You can also access Surface Wrap from within the Model Assessment Toolkit:

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Surface Wrap Workflow

  1. Set up your model in the wind tunnel.
    • Click Surface Wrap  Configure External Volume.
    • Size the volume using the appropriate dialog options.
    • Click Close to exit the dialog.
  2. Use Surface Wrap  Configure Resolution Factor to set the appropriate level of detail for your surface mesh. Notable highlights:
    • High values gives you a mesh that closely represents the physical model.
    • Lower values result in a faster, but coarser mesh.
  3. Click Surface Wrap  Wrap Generate Wrap to create your surface mesh.
  4. Click Surface Wrap  Continue Transfer Wrap to Setup to transfer your mesh to CFD and continue with model preparation.

Since its introduction, Automatic Mesh Sizing has greatly simplified the modeling process. Automatic Mesh Sizing defines a mesh that is optimized for the model and accurately represents every detail of the geometry.

A good representation of the geometry is only one requirement for a high fidelity solution. For example, the flow on a simple model with a uniform mesh can contain significant gradients. The results on the coarse mesh may not be highly accurate, but they do indicate flow trends. These trends can be used to identify where the elements should be concentrated to improve solution accuracy.

Mesh Adaptation uses solution results to progressively improve the mesh definition. The simulation is run several times. Each time the results in the previous cycle are used to improve the mesh in the next cycle. The result is a mesh that is optimized for the particular simulation. The mesh is finer for high gradient regions, and coarser elsewhere.

When Mesh Adaptation is enabled, the following occurs:

  1. A baseline scenario is run to completion.
  2. The mesh is changed (often refined) based on velocity, pressure, and temperature (if available). The simulation is run to completion.
  3. The process repeats for each Adaptation cycle.

The result is an intelligently refined mesh that is tuned for the flow and temperature results fields.

Limitations

Mesh Adaptation does not support the following simulation types or settings:

  • Transient simulations (including Motion and Rotating)
  • 2D models
  • Surface parts
  • Extruded meshes

Mesh Independence

When using Mesh Adaptation, it is important to know when the solution has achieved mesh independence. Mesh independence is the coarsest mesh that produces results that do not change after the mesh is refined. During each adaptation step, Autodesk® CFD evaluates the pressure, velocity, and temperature fields to determine how close your solution is to mesh independence. At the conclusion of each step, Autodesk® CFD reports the mesh independence status in the Output bar in a message similar this:

Mesh independence: Pressure: 85% Velocity 98% Temperature 97%

These values indicate how converged your simulation is for each quantity. Higher values indicate less sensitivity to the mesh, which means your solution is approaching mesh independence.

For best results, you should ensure that each adaptation cycle runs to convergence (or as close as possible). If your adaptation cycles only run for a small number of iterations, this failing to reach convergence, the Mesh Independence indicators will not be accurate.

Note: Mesh Adaptation does not provide the mesh independence report for the first (nominal) simulation.

Additional Notes

  • You should define an initial mesh that follows standard mesh best practices. This helps to arrive at the mesh independent solution more efficiently.
  • Because Mesh Adaptation runs several cycles to arrive at the final mesh, the complete analysis can take longer to run than a scenario run without Adaptation. Additionally, the overall element count can grow considerably larger than the original mesh. Be careful with complex models that are initially large, as they will take much longer to run. The benefit, however, is that the resultant solution is mesh independent.
  • When you click Stop on the Solve dialog, the current cycle stops, and no further adaptation cycles are run. To run additional adaptation cycles after the simulation has stopped, click Enable Adaptation on the Adaptation tab. The solver runs the prescribed number of Cycles to Run.
  • Note that Adaptive Meshing works for both Automatic Mesh Sizing and Manual Mesh Sizing.
  • The folder that contains the scenario must exist in the Design Study folder structure. Results must exist within the scenario folder to apply mesh adaptation to a scenario that has been run.
  • When a simulation is continued from iteration 0, all saved results are deleted and Adaptation is disabled. To adapt the mesh for the current design, first run the current scenario with Adaptation disabled. Upon completion, enable Adaptation, and continue the simulation. The completed scenario becomes the baseline for subsequent mesh adaptation cycles.
  • Every cycle runs either the number of specified iterations or until convergence is detected by Automatic Convergence Assessment. Because finer meshes typically require more iterations to converge, it is good practice to specify at least 300 iterations on the Solve dialog. This ensures that every mesh in the process can attain convergence.

For an Example model showing how to use Mesh Adaptation…

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