Does anyone know if there are theory guides for design modeller as there are for Fluent?

I'm interested in the method used to generate curves from point data? I'm struggling to validate my Fluent analysis with experimental data and after checking and re-checking inputs, setup and outputs I am starting to wonder if it could be related to the original aerofoil coordinates or the method in which the curves are generated from the coordinates. 

Here is my plot of pressure coefficient against the experimental data. 

Many thanks,