Extracting (U_x) and (U_y) velocities from a specified sub-domain
 

Hello everyone,

I’ve extracted my u and v component velocities for that specified zone (sub-domain) in the entire domain from the VTK files in Python. Now, I found something unusual: for the same x-grid point, four (4) y-grid points are shown in my extracted data, and their corresponding u and v velocities are also different. For example, (385.875, 406.98), this point appears four times, and their corresponding U_x and U_y velocities are also different. The attached figure from Excel is for reference.

Attachment 98341

Any comment on this?
Are the values of my U_x and U_y cell-centered values or cell-point values? If not, how can I extract the cell-celled values, not the point values?
Thanks in advance
Nafiz