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From the Boundaries section of the action bar, click Free Stream
 .
- Optional: Customize the Name of the free stream condition.
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Select the free stream Support.
- Specify the free stream Mach number at the boundary.
- Describe the flow Direction along the Axis system definition, which can be defined using one of the following options:
| Option | Description |
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| Global | The global axis system. |
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| Local | A local axis system specified as a component of the part definition. You can select the triad for the local axis system by clicking it in the 3D area. If no local axis system is available, you must define one in a part definition app. |
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| Specify | Orient the flow vector directly by right-clicking the feature triad glyph on the model and selecting an orientation tool. |
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- Specify the free stream static Temperature.
- Describe the turbulent flow at this boundary by selecting a Turbulence specification and customizing its settings.
The specific turbulence customization settings that appear depend on your specification choice and on the turbulence model you chose in the physics definition. For a full description of all available turbulence settings, see Initial Turbulence Options. The following turbulence specifications are available: | Option | Description |
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| Viscosity ratio | Define turbulence by specifying the eddy viscosity ratio. |
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| Intensity - Length scale | Define turbulence by specifying the turbulence intensity, characteristic length scale, and velocity scale. |
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| Turbulent viscosity | Define turbulence by specifying the kinematic eddy viscosity. |
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For compressible flow simulations, specify the Static gauge
pressure of the fluid at the inlet.
- Click OK.
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