Relating outputs in get_scalar_field_data() and get_surface_data()

[aromesh]

Hi,

I am using both get_scalar_field_data( ) and get_surface_data( ) for some post processing.
Scalar values like pressure are obtained from get_scalar_field_data and face normals and centroid positions are obtained from get_surface_data.

My end goal is to perform some sort of force calculation like (pressure * centroid_location * face_normal) for every facet on a particular face.

Both methods give a list of values for a particular surface that is probed, but it is not clear if the order of the values are consistent between both approaches.

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Test Approach:

My approach to test this is to find the magnitude of FacesNormal obtained from get_surface_data( ) which can be compared with face_area_magnitude obtained from get_scalar_field_data( ).
However, these values don't match up.

face_area_data = solver.field_data.get_scalar_field_data(surface_name='in_cold', field_name='face-area-magnitude', node_value=False)

for value in face_area_data:
    print(value.scalar_data)

vs

face_normal_data = solver.field_data.get_surface_data(data_type=SurfaceDataType.FacesNormal, surface_name='in_cold')
for value in face_normal_data:
    area = math.sqrt( pow(value.x, 2) + pow(value.y, 2) + pow(value.z, 2))
    print(area)

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I'm not fully sure if this is the best way to compare this.
Can you confirm that the order of these values is consistent between both methods, and if there is a way to confirm it?

Thanks,
Akash