The matchedFlowRateOutletVelocity is a velocity-outlet boundary condition that corrects the extrapolated velocity to match the flow rate of the specified corresponding inlet patch.


The condition requires entries in both the boundary and field files.

Boundary file

    type            patch;

Field file

    // Mandatory entries
    type            matchedFlowRateOutletVelocity;

    // Optional entries
    inletPatch      <word>;
    rho             <word>;
    volumetric      <bool>;

    // Inherited entries


Property Description Type Required Default
type Type name: matchedFlowRateOutletVelocity word yes -
inletPatch Name of patch from which the corresponding flow rate is obtained word yes -
rho Name of the density field used to normalize the mass flux word no rho
volumetric Flag to enable volumetric- (true) of mass-based flow rate bool no true

The inherited entries are elaborated in:

Further information


  • N/A

Source code:



  • Introduced in version v1712