Problem with results in 2 phase flow (airstream+rain drops) over s809 wing using DPM
 

Hello everybody.It seems i am having problems with some of my results concerning the 2phase flow of raindrops-airstream over a s809 wing.I am supposed to get increased drag and reduced lift,compared to the one phase flow (airflow) over the wing,and i do so for most of my AoA tested except for 2 of them,namely 5 and 14.I did some experimenting on the distance of the plane that injects the particles (surface injection) and i got some other 2 problematic angles of attack instead.I also changed the flowrate with not that much of a different result.In the problematic AoA i can see,in particle tracking,that there are no splashes in the upper part of the airfoil or not as many as in the other angles.Any suggestions?