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For CFD we are interested in this layer because it is where wind velocity and turbulence is developed. The Atmosphere Boundary Layer is described with the Log wind profile, which is used to describe the vertical distribution of horizontal mean wind speeds.

For most users, we don't recommend using the Atmosphere Boundary Layer as a boundary condition as it requires more parameters and that increased complexity not always correspond to a more accurate result.

The Compute plugin defines the Atmosphere Boundary Layer as a boundary condition preset that you can apply and override, so it suits your case.

The atmBoundaryLayer preset is defined like this:

atmBoundaryLayer {
    U   {
        type atmBoundaryLayerInletVelocity;
        Uref                 10.0;
        Zref                 20;
        zDir                 (0 0 1);
        flowDir              (1 0 0);
        z0                   uniform 0.1;
        zGround              uniform 0;
        value                uniform ( 0 0 0 );
    }
    epsilon {
        type atmBoundaryLayerInletEpsilon;
        Uref                 10.0;
        Zref                 20;
        zDir                 (0 0 1);
        flowDir              (1 0 0);
        z0                   uniform 0.1;
        zGround              uniform 0;
        value                uniform 0.01;
    }
    k           { type kqRWallFunction; value uniform 0; }
    p           { type zeroGradient; }
    omega       { type omegaWallFunction; value uniform 0; }
    nut         { type calculated; value uniform 0; }
}

To change the Uref value apply this override:

{"U": '{Uref 5;}'}

Read more about the atmBoundaryLayer at OpenFOAM's documentation page

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