The Interior Fan condition represents interior boundaries where a fan condition is set using a fan pressure curve to avoid an explicit representation of the fan. The
Interior Fan defines a boundary condition on a slit for laminar flow. That means that the pressure and the velocity can be discontinuous across this boundary.
This boundary condition acts like a Pressure Conditions boundary condition on each side of the fan. The pressure at the fan outlet is fixed so that the mass flow rate is conserved. On the fan inlet the pressure is set to the pressure at the fan outlet minus the pressure drop induced by the fan. The pressure drop is defined from the static pressure curve, and is usually a function of the flow rate. To define a fan boundary condition on an exterior boundary, the
Fan condition should be used instead.
The Flow direction can be defined by selecting
Along normal vector or
Opposite to normal vector. This defines which side of the boundary is the fan’s inlet and which side is the fan’s outlet.
When Inlet is selected as the
Flow direction and the
Turbulence model has transport equations for the turbulent kinetic energy,
k, and turbulent dissipation rate,
ε, specific dissipation rate,
ω, or turbulent relative fluctuations,
ζ, the values of the
Turbulent kinetic energy, Turbulent relative fluctuations (for the v2-f turbulence model) and the
Turbulent dissipation rate or
Specific dissipation rate on the downstream side of the fan should be specified. Alternatively, the
Reference velocity scale can be used to specify default values
After a boundary has been selected, an arrow displays in the Graphics window to indicate the selected flow direction. If the selection changes, the arrow can be updated by clicking any node in the
Model Builder and then clicking the
Interior fan node again to update the
Graphics window.
