LES mapped inlet
 

Hi Foamers
I am trying to do LES of a diffuser like as in Eugenes Thesis.
To get grasp of mapped inlet at first I am testing just a plane channel.
I map a plane in midway back to inlet with zeroGradient outlet.

The blockMeshDict reads

type mappedPatch;
offset (5 0 0 );
sampleRegion region0;
sampleMode nearestCell;
samplePatch none;

and the 0/U reads

velocity_inlet
{
type mapped;
value uniform (20 0 0);
interpolationScheme cell;
setAverage false;
average (20 0 0);
}

The case runs. But the mean values are very less like 1/100 of what I specify i.e. 20m/s.
What can be the reason?
Thanks