The dimension of CFD domain in blockMeshDict

[QB-Lin]

Thank you for building the openfast-adapter. I have some questions about the computational domain sizes in OpenFOAM.
In the Case CFD-turbine in the folder “openfast-adapter”, the vertices coordinates are defined as below:

convertToMeters 1;

vertices
(
    ( 7.02 -1.35 -0.82) // 0
    ( 7.02  1.35 -0.82) // 1
    (-4.05  1.35 -0.82) // 2
    (-4.05 -1.35 -0.82) // 3
    ( 7.02 -1.35  1.08) // 4
    ( 7.02  1.35  1.08) // 5
    (-4.05  1.35  1.08) // 6
    (-4.05 -1.35  1.08) // 7 
);

blocks
(
    hex (0 1 2 3 4 5 6 7)
    (32 96 24)
    simpleGrading (1 1 1)
);

The size unit might be meter.
The rotor diameter and tower height of NREL 5-MW wind turbine are 126 m and 90 m, respectively. The dimensions of wind turbine in OpenFAST seem much larger than those in the OpenFOAM.

I modified the dimension of blockMesh as below:

convertToMeters 1;
vertices
(
    ( 1680 -480.0 0) // 0
    ( 1680  480.0 0) // 1
    (-720  480.0 0) // 2
    (-720 -480.0 0) // 3
    ( 1680 -480.0 960) // 4
    ( 1680  480.0 960) // 5
    (-720  480.0 960) // 6
    (-720 -480.0 960) // 7 
);

blocks
(
    hex (0 1 2 3 4 5 6 7)
    (160 288 96)
    simpleGrading (1 1 1)
);

However, the FSI simulation seems failed.
How does OpenFAST receive the velocity mapped from OpenFOAM?
How do we define the sizes of CFD domain?