I want to find out how much drag a bug wipers will add to a glider flying at various speed from 25 to 50 m/s.

Before simulating the actual wing and wiper I decided to see if simulations return a value close to a theoretical value for a sphere which I have calculated using the formula: F= 0.5* density* velocity squared *coefficient*area which gave me F=0.5*1.1965*30^2*0.47*PI*0.025^2=0.4897N

I have uses k omega sst simulation but I am not sure about the following:

- what k and omega values should I use? can I stick to default values?
- for turbulence wall should I use full resolution or wall function?
- is there a way to find total drag in one direction or do I need to add all forces in wind direction acting on the ball (pressure + viscous)?
- So far after running the simulation I am getting 0.467N which is a bit off. Am I doing something wrong?