Reference / Input deck / model / boundary conditions / inflow

inflow

type: inflow

Pressure-based inflow boundary condition.

zonesrequired reference kind total pressure ratio mass flow ratetotal temperature ratioadvanced static pressure ratioadvanced directionadvanced machadvanced mass flow ratioadvanced

zonesrequired

list of zone ids·required

Mesh zone ids this boundary condition applies to.

Used in3DBump

Guidance: Choosing boundary conditions →

reference

str·not set by default

Reference condition the inflow state and its ratios are taken from.

Used in3DBump

total temperature ratioadvanced

float·default 1·'total temperature ratio' only applies when reference is set

Inlet total temperature as a ratio of the reference static temperature.

Used in3DBump

kind

not set by default

How the inflow state is set.

Options

Value	What it does
pressure	Velocity and density are derived from a total pressure ratio and a total temperature ratio relative to 'reference'.
massflow	The inlet velocity is set from a mass flow rate or a mass flow ratio.
default	Incompressible solver only: the inflow state is taken directly from the reference condition.

Used in3DBump

static pressure ratioadvancedpressure only

float·not set by default·'static pressure ratio' only applies when reference is set

Inlet static pressure as a ratio of the reference static pressure.

total pressure ratiopressure only

float·default 1

Inlet total pressure as a ratio of the reference static pressure.

Used inplate

directionadvancedpressure / massflow only

unit vector (3 floats)·not set by default

Direction the flow enters along; unset, it enters normal to the boundary.

machadvancedpressure only

float·not set by default·> 0

Inlet Mach number; the inlet static pressure then follows from the total pressure ratio and this Mach number rather than from the interior flow.

mass flow ratemassflow only

float·not set by default·> 0 kg/s·'mass flow rate' is required when solver.solver settings.type is 'compressible' and mass flow ratio is unset; give either 'mass flow rate' or 'mass flow ratio', not both

Mass flow rate through the inlet zones, as a magnitude: the inflow or outflow type sets the direction. The mesh must be in metres.

Used in3DBump

mass flow ratioadvancedmassflow only

float·not set by default·> 0·'mass flow ratio' only applies when reference is set

Inlet mass flow divided by the reference mass flux, rho_in U_in A_in / (rho_ref U_ref), with A_in in mesh units; a magnitude, since the inflow or outflow type sets the direction.