Airofil Again!

Steven

Back again with another Airfoil problem!

I have been trying to get cl slopes for various different planforms of wing, the run converges fine until sepertaion occurs, at this point the simuation becomes transient as the residuals just oscilate. All ok so far. I monitored the lift and drag values during the solver and they also oscilate after seperation first occurs. I was assuming (as nuerical accuracy is not too important in my study) that the average between upper and lower oscialltions would be accepatable thus avoiding the need to run transient simulations. However my problem is that in post process the seperation is occuring (flow vis) as expected but the lift value just continues onwards with no regard for reality! Why is teh flow showing seperation but the force values are not reducing?

Any Ideas? Could I be missing the stall inbetween divisions of AOA? Can i take average values for lift between the osccialtions and if not, wont a transient simulation still have oscialitng lift values?

Any help much appreciated....dissertaion deadline looming.....

Steve