When the pvtu files are created, the names of the corresponding .vtu files includes the directory name, and then the .pvtu and the .vtu files are written in the same directory.
If the .pvtu files are in the same directory as the .vtu files, the directory name should not be in the file name (another solution would be to write the .pvtu files in the parent directory, but I don't think that's a good idea).
When the pvtu files are created, the names of the corresponding .vtu files includes the directory name, and then the .pvtu and the .vtu files are written in the same directory.
If the .pvtu files are in the same directory as the .vtu files, the directory name should not be in the file name (another solution would be to write the .pvtu files in the parent directory, but I don't think that's a good idea).