Hi,
I am using Aerodyn v15.02 to calculate a horizontal axis tidal turbine in two cases: steady and unsteady.
However, I encounter the requirements of providing some input parameters in unsteady aerodynamic case.
Specifically, they are:

C_nalpha: the slope of the 2D normal force coefficient curve in the linear region.

Cn1: the critical value of C0n at leadingedge separation for positive AoA and should be extracted from airfoil data at a given Reynold’s number and Mach number; Cn1 can be calculated from the static value of Cn at either the break in the pitching moment or the loss of chord force at the onset of stall; Cn1 is close to the condition of maximum lift of the airfoil at low Mach numbers.

Cn2: the critical value of C0n at leadingedge separation for negative AoA and should be extracted from airfoil data at a given Reynold’s number and Mach number; Cn2 can be calculated from the static value of Cn at either the break in the pitching moment or the loss of chord force at the onset of stall; Cn2 is close to the condition of maximum lift of the airfoil at low Mach numbers.
I do not know how to capture these parameters.
So, I will be very grateful if someone can show me how to capture them.
Thank you very much for this help.
I look forward to hearing from you.
Best regards,
Ngoc Ha Tran.