inletOutlet Boundary Condition

The inletOutlet boundary condition is normally the same as zeroGradient, but it switches to fixedValue if the velocity vector next to the boundary aims inside the domain (backward flow). The value of that fixedValue is inletValue. See figure ([*]).

Figure: The meaning of inletOutlet boundary condition
Image sketch-inlet-outlet-boundary-condition-openfoam
U:
 boundaryField
 {
 ".*_outlet"
    {
        type            inletOutlet;
        value           $internalField;
        inletValue      uniform (0 0 0);
    }
 }


k, omega, epsilon, T:
 boundaryField
 {
 ".*_outlet"
    {
        type            inletOutlet;
        value           $internalField;
        inletValue      uniform 0;
    }
 }



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