Document Details

Document Type : Thesis 
Document Title :
Computational Study of Wake-Vortex Asymmetry Around Slender Body at High Angles of Attack
دراسة حسابية للدوامات غير المتماثلة حول جسم اسطواني عند زوايا الهجوم العالية
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : Large eddy simulation was carried out on ogive-cylinder slender body at high angles of attack. The study was conducted for at and . As a result, the asymmetry was obtained at without introducing any flow perturbation or geometrical irregularities. The investigation of steady flow field showed the generated side force along the body which is caused as a result of asymmetric wake-vortex. On the other hand, and vorticity iso-surfaces of the unsteady flow field illustrated the development of the wake-vortex with respect to angles of attack. Fast Fourier Transformation (FFT) was applied to determine the dominant flow modes. The analysis identified three modes. A low frequency mode representing von Karman vortex shedding, an intermediate frequency which is referred to in the literature as vortex interaction, and a high frequency demonstrating free shear layer mode. It was observed that all three modes were present at the angles of attack which exhibited asymmetric wake-vortex ( ). Furthermore, the influence of grid size and numerical schemes was examined on the obtained solution. It was concluded that a sufficiently fine grid is required to study the development of the unsteady flow. Also, an unbiased discretization scheme is essential to simulate this phenomenon. 
Supervisor : Dr. Ibraheem AlQadi 
Thesis Type : Master Thesis 
Publishing Year : 1438 AH
2017 AD 
Added Date : Tuesday, July 11, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أسامة أحمد عبيدObeid, Osama AhmadResearcherMaster 

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