[yewi]

Hi, i am running a simpleFoam model for a certain site. Can anyone explain why there is a deceleration of wind reaching the development, at mid level of the building (z = 41.5) ? Attached are the pictures of two different cases and BC for U, p, and nut.

Thank you in advance

object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 -2.000 0);
boundaryField
{
MinX
{
type zeroGradient;
}
MaxX
{
type zeroGradient;
}
MinY
{
type zeroGradient;
}
MaxY
{
type atmBoundaryLayerInletVelocity;
value uniform (0.000 0.000 0.000);
Uref 4.343;
Zref 600.000;
zDir (0.000 0.000 1.000);
flowDir (0.000 -1.000 0.000);
z0 uniform 0.700;
zGround uniform 0.000;
}
MinZ
{
type fixedValue;
value uniform ( 0 0 0 );
}
MaxZ
{
type zeroGradient;
}
}

object nut;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -1 0 0 0 0];
internalField uniform 0;
boundaryField
{
MinX
{
type zeroGradient;
}
MaxX
{
type zeroGradient;
}
MinY
{
type calculated;
value uniform 0;
}
MaxY
{
type calculated;
value uniform 0;
}
MinZ
{
type nutkRoughWallFunction;
Ks uniform 1.0;
Cs uniform 0.5;
value uniform 0.0;
}
MaxZ
{
type zeroGradient;
}
}

object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -2 0 0 0 0];
internalField uniform 0;
boundaryField
{
MinX { type zeroGradient; }
MaxX { type zeroGradient; }
MinY
{
type fixedValue;
value uniform 0;
}
MaxY { type zeroGradient; }
MinZ { type zeroGradient; }
MaxZ { type zeroGradient; }
}