In many cases it is useful to prescribe mass flow rate together with inlet velocity angles. Meridian angle and circular angle are prescribed. Their definitions can be found in figures () and ().
p:

boundaryField
{
".*_inlet"
{
type zeroGradient;
}
}

U:

boundaryField
{
".*_inlet"
{
type turboMassFlowUniformDirectedInletVelocity;
value $internalField;
axis (0 0 1); // axis z-plus
origin (0 0 0);
merAng 90; // => from axis
circAng 120.0; // => from tangent
flowRate 0.031923077;
}
}