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5.3 Boundary Conditions

Boundary conditions consist of flow inlets and exit boundaries, wall, repeating, and pole boundaries,
and internal face boundaries. All the various types of boundary conditions are discussed in the
sections that follow.

5.3.1 Flow Inlet and Exit Boundary Conditions

ANSYS FLUENT has a wide range of boundary conditions that permit flow to enter and exit the
solution domain. To help you select the most appropriate boundary condition for your application,
this section includes descriptions of how each type of condition is used, and what information is
needed for each one. Recommendations for determining inlet values of the turbulence parameters are
also provided.

5.3.2 Using Flow Boundary Conditions

This section provides an overview of flow boundaries in ANSYS FLUENT and how to use them.

ANSYS FLUENT provides 10 types of boundary zone types for the specification of flow inlets and exits:
velocity inlet, pressure inlet, mass flow inlet, pressure outlet, pressure far-field, outflow, inlet vent,
intake fan, outlet vent, and exhaust fan. The inlet and exit boundary condition options in ANSYS
FLUENT are as follows:

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