Define inlet flow conditions in a valve model

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To prepare for running a valve model simulation in Autodesk CFD, you must specify the physical characteristics of the model.

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This includes defining boundary conditions, such as a velocity value for inlet flow.

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

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To make sure all the parts are visible, hold CTRL while middle clicking anywhere off the model.

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Left-click to select the inlet face.

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Next, on the ribbon, in the Boundary Conditions context panel, click Edit.

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In the Boundary Conditions quick edit dialog, under Property settings, enter a Velocity Magnitude of “1000”.

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Click Apply.

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To verify that the boundary condition is properly assigned to the inlet, check the Design Study Bar.

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Then, ensure that the stripe on the inlet face corresponds to the boundary conditions type in the legend.

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Note that in this example, a constant velocity was applied.

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In many valve simulations, the flow rate or the pressure drop is known.

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Either boundary condition can be used instead of a specified velocity,

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as long as you do not apply more than one flow condition to the same inlet.

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With the inlet flow condition properly assigned, the next step is to assign a boundary condition to the valve outlet.