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Deanship of Graduate Studies
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 Type
Dr Grade
Email
ياسر أبوعبيدة العوض
Elawad, Yasir Abuobaida
Researcher
Master
Files
File Name
Type
Description
39692.pdf
pdf
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