defining the non axis hub in autogrid by external IGG file?
 

Hello, I am using the numeca132 to perform simulation on compressor with non axis hub. I search the user guide and find the following content:

The non-axisymmetric surfaces are stored in external IGG™ data file and specified into the ".geomTurbo" file using the following format:

https://drscdn.500px.org/photo/10174...96c335b14a1267

Any type of surface created and stored by IGG™ can be used to defined the non-axisymmetric end walls.

I would appreciate it that anyone can tell me about the external IGG file. Is the file exported from the IGG? Or does anyone know the file format?

Thank you very much!!!