Separated flow over single fowler flap attaches after increase in angle of attack -- CFD Online Discussion Forums

February 28, 2012, 03:24	Separated flow over single fowler flap attaches after increase in angle of attack	#1
Sonil New Member Sonil Singh Join Date: Sep 2011 Posts: 5 Rep Power: 14	Hi all, I've been studying flow over flaps (2d-case). The case i need help with is of a single fowler flap at deflection of 30 deg for landing configurations. My study was to optimize flap position. But while generating polar I observed sudden rise in CL at 15 deg AoA. In post process I observed flow on the flap was separated till 14 deg AoA and is attached at 15 deg. I have not been able to reason the cause. I did observe this in almost all other case except few. Please if someone can help me understand what happens or can refer me some paper to read on this topic.

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