Here is a quick overview of Fluent’s flow boundaries. There are 10 types of boundary zones for entering and leaving the flow as follows:
Velocity Inlet: It is used to define the velocity and other scalar quantities in the flow input.
Pressure Inlet: The term “pressure inlet” is used to define the total pressure and other scalar quantities in the flow input.
Mass Flow Inlet: A compressible flow is used to express the mass flow rate (flow) at the inlet, since in a constant density state, this boundary condition is as the same as the boundary condition of velocity. In incompressible flow using this boundary is not suitable.
Pressure Outlet Parameter: To define the static pressure of the outlet flow. Applying the above boundary condition to other outlet conditions when the return flow occurs Often, it results in better convergence.
Boundary condition: Pressure far-field is used to model a dense free flow in far-field. In this condition, the Mach number should be determined to be free flow and its static conditions, explaining that this condition is used only for compressible flow.
Outflow Boundary Condition: Used to model the flow in the outlet, in which flow details such as pressure and velocity at the beginning of the problem are not specified. This type of boundary is particularly suitable for outlets with a fully developed flow as the gradients are perpendicular to the flow (except for the pressure) are zero. Of course, this condition can’t be used in compressible flows.
Boundary condition: Inlet Vent is used to modeling the inlet valve (ventilation) by specifying the specific drop coefficient, flow direction, total pressure, and temperature.
Boundary condition: Intake Fan to model the outlet of a fan located at the inlet of a zone.
Boundary condition: Outlet Vent to model outlet valve (ventilation) if the coefficient is known by Specific drop, static pressure, and temperature loss.
Boundary condition: Exhaust Fan is used to model the inlet of a fan that is located at the outlet of the site, with the apparent sudden change in pressure and static pressure loss.
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