unsteady UDF
 

I need to know how can i get the equation for an UDF for NACA 0012 at MACH 0.7 & angle of attack of 3.2 unsteady flow. I just practiced the official tutorial of fluent for unsteady flow. Is the UDF always like this simple hermonic equation? what does this parameters in this equation means. Anyone please answer. PLEASE refer some source where i can know details about that.