Define the return boundary in an AEC model

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To prepare for running an ambient room temperature simulation in Autodesk CFD,

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you must specify the physical characteristics of the model.

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This includes defining boundary conditions, such as using a gage pressure to simulate the outlet to the return duct.

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Begin by selecting Boundary Conditions on the Setup tab of the ribbon.

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Left-click the return surface to select it.

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Then, on the Setup tab of the ribbon, in the Boundary Conditions context panel, click Edit.

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In the Boundary Conditions quick edit dialog, expand the Type drop-down and select Pressure.

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Leave the Unit set to Psi, and set the Pressure to 0.

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This defines a static gage pressure of 0, which simulates the outlet to the return duct.

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Click Apply.

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To verify that the boundary condition is correctly applied to the return flow outlet,

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in the Design Study Bar, ensure that the Pressure condition appears with a value of 0 Psi.

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Also, in the graphics window, ensure that the color of the stripe on the supply surface corresponds to the legend.

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With the internal boundary conditions properly set, the next step is to assign the external boundary conditions.