How to extract/get two adjacent node numbers/Ids near the centroid of a circular face through API?

Hi,
I need to impose displacement boundary conditions on two adjacent nodes near the centroid of a circular face of a composite geometry. In this regard, I need to know the two adjacent node Ids. Note that element spacing on the face is kept at 0.2 mm. I was able to extract the node Ids on the face; but, don't know how to get the two adjacent node Ids near the centroid of the face using API in Ansys Workbench Shell.

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AlexGh

Hello Stacky!
Please check this link:
https://discuss.ansys.com/discussion/2839/how-to-get-a-body-or-node-id-associated-with-a-known-coordinate-point-location
To obtain the coordinates of the center of the surface:

faceId = 35
geofaceWrapper = ExtAPI.DataModel.GeoData.GeoEntityById(faceId)
faceCenter = geofaceWrapper.Centroid

If there are few nodes on the surface, the adjacent nodes can be found by simple iteration over all the surface nodes. For a large number of nodes (>100,000), a KDTree can be used.
Can you provide more context? Perhaps an image?

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AlexGh

faceId = 35
geofaceWrapper = ExtAPI.DataModel.GeoData.GeoEntityById(faceId)
faceCenter = geofaceWrapper.Centroid

Stacky

Thank you @AlexGh for your help. I was able to sort it out with your tip. I wrote the following:

        for node in nodes:
            cx=node.X
            cy=node.Y
            cz=node.Z
            distc=sqrt((bx-cx)**2+(by-cy)**2+(bz-cz)**2)
            if distc<dist:
                myn=node.Id
        sidn.Ids=[myn, myn+1]
        dnbc.Location=sidn