Identify one or more outlet surfaces and define the conditions.
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On the Fluids ribbon, select the Outlet tool.
![](../../images/icons/cfd/icon_cfd_outlet.png)
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Select one or more surfaces as the outlets.
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In the microdialog, define the pressure.
Tip: The pressure is defined relative to the
atmospheric pressure. To set the outlet pressure equal to the atmospheric
pressure, enter 0.