Document Details

Document Type : Thesis 
Document Title :
Low Frequency Flow Oscillation over NACA-0012 Airfoil near Stall Conditions
الإهتزازت ذات التردد المنخفض للسريان حول جُنيح NACA-0012 بالقرب من وضع الإنهيار
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : The objective of the present work is to investigate the low-frequency flow oscillation phenomenon near stall conditions for the flow field around a NACA-0012 airfoil at Reynolds number of 9×〖10〗^4 and Mach number of 0.4. Large eddy simulations are performed at angles of attack 〖10.0〗^∘, 〖10.25〗^∘, 〖10.4〗^∘, 〖10.6〗^∘, 〖10.8〗^∘, 〖11.0〗^∘, and 〖11.2〗^∘ to examine the effect of angle of attack on the phenomenon. The effect of grid resolution on bubble characteristics and aerodynamic coefficients is studied. Qualitative study is performed for a complete low-frequency flow oscillation cycle to investigate the unsteady behavior of laminar separation bubble throughout the cycle. The phenomenon is captured in the time histories of aerodynamic forces. It is found that the low-frequency flow oscillation is pronounced in magnitude, quasi-periodic, and self-sustained at the angles of attack 〖10.8〗^∘, 〖11.0〗^∘, and 〖11.2〗^∘. Statistical and spectral analyses are carried out for aerodynamic coefficients. Low order statistical analysis for lift, drag, and moment coefficients are in agreement with the low Reynolds number stall characteristics. The lift coefficient spectrum exhibits a dominant low frequency mode in the flow field. 
Supervisor : Dr. Eltayeb Eljack 
Thesis Type : Master Thesis 
Publishing Year : 1438 AH
2017 AD 
Added Date : Wednesday, May 3, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
ياسر أبوعبيدة العوضElawad, Yasir AbuobaidaResearcherMaster 

Files

File NameTypeDescription
 39692.pdf pdf 

Back To Researches Page