[MMRC]

Hello all!



I found that actuatorDisk-fvOption gives low deficit in velocity when simulating a single windturbin in flat terrain, taking in consideration the ABL B.C.


Maybe, it comes from a bad input of information in fvOption dictionary. I have not found thesis or papers that uses this tool that comes with openfoam, so I don't have a reference if my inputs are ok or if this tool is trully reliable...


My case: Stream flow goes in +x, the 'y' is spanwise axis and 'z', vertical. My windTurbine is 80 m diameter, its hub height is 80 m, and it's hub-centre is located at P1(500,640,80)m. This case actuator is a SINK. I don't have the curve of cp or ct but I know the values of them for Uhub, that's why I entry them as a constant:

disk1
{
type actuationDiskSource;
variant variableScaling;
selectionMode cellSet;
cellSet actuationDisk1;
diskArea 1507;
diskDir (1 0 0);
writeToFile true;
sink true;
Cp 0.44;
Ct 0.63;
upstreamPoint (350 640 80);
}

In topoSet I have entry:

actions
(
// actuationDisk1
{
name actuationDisk1CellSet;
type cellSet;
action new;
source cylinderToCell;
p1 (500.3 640 80);
p2 (500.7 640 80);
radius 40;
}
{
name actuationDisk1;
type cellZoneSet;
action new;
source setToCellZone;
set actuationDisk1CellSet;
}

);

Note: maybe my error is at diskArea? turbineSetting tutorial, the planar area should 100 but they entry 40m...



I appreciate any comments about this tool or other solutions to approach wind turbine simulation via AD method in openfoam.



Thanks!

[wkernkamp]

The disk area should be pi/4*80^2 is about 4800.