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Prachi July 18, 2007 07:27

Calculation of lift and drag coefficients
 
Hi,

I ma trying to calculate the lift and drag coefficient for a NACA0012 at different angles of attack. I have run and post processed the results which look great. But I am unable to figure out what variables to use to calculate the lift and drag forces. Any help in this regards would be highly appreciated.


Patrick July 18, 2007 08:35

Re: Calculation of lift and drag coefficients
 
Hello,

Just take the function calculator and calculate the force in the direction you want.

Regards

liu July 18, 2007 18:52

Re: Calculation of lift and drag coefficients
 
you can get the lift and drag force in the solver, and then use the function to get the coefficient

Jagdishchandra B Patel August 14, 2007 14:05

Re: Calculation of lift and drag coefficients
 
Hi,

cl is propotional angle of attack ( up to stall) cl is propotional to shape and size of wings

cd is increasing very fast after stall.

cl is maximum at an angle just before stall. cd is minimum at an angle just before stall.

ratio of cl/cd is highest near stall. induced drag creats lift upto stall angle. induced drag becomes profile drag after stall angle.

J.B.Patel mechanical engineer.


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