In ANSYS Fluent, an opening boundary condition, also referred to as a pressure outlet boundary condition, is used to simulate an outlet where the flow exits the computational domain. It allows the fluid to leave the domain freely without any restrictions. Here's how to define it:
* Select the Boundary: Identify the faces in your geometry that represent the opening.
* Assign Boundary Condition: Go to the "Boundary Conditions" menu and select "Pressure Outlet" for the chosen faces.
* Specify Gauge Pressure: Set the gauge pressure at the outlet. This can be set to zero for atmospheric pressure or a specific value depending on your simulation.
* (Optional) Backflow Conditions: If backflow is expected, you can define the velocity or other flow variables at the outlet.
Choosing the Right Outlet Boundary Condition:
The pressure outlet condition is appropriate when the flow exits the domain and the pressure is unknown but not necessarily zero. For supersonic outlets or when the flow direction is unknown, consider using a more advanced outlet boundary condition like the Outflow condition.
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