AME Seminar: Shirzad Hosseinverdi
Thursday, September 30, 2021 at 4:00 pm
Shirzad Hosseinverdi
AME Ph.D. Candidate
"Numerical Investigation of Laminar-Turbulent Transition in Active Flow Control of Separation Bubbles"
AME Lecture Hall, Room S202
Zoom: 873 0364 5198
Abstract: For many important aerospace applications operating within a Reynolds-number regime for which a strong interaction exists between separation and transition, successful active flow control strategies to mitigate the detrimental effects of boundary-layer separation could lead to significant performance gains. Previous research has shown that an effective and efficient separation control is achieved when an inviscid shear-layer instability is exploited. The main goal of this research is to understand how targeting both primary and secondary instabilities of laminar separation bubbles can affect the mean flow topology and laminar-turbulent transition process in controlled separation bubbles. Toward this end, secondary instability analysis based on the full linearized Navier-Stokes equations and high-fidelity direct numerical simulations were employed to investigate global stability characteristics of canonical separation bubbles that are actively controlled by periodic two-dimensional forcing through a blowing and suction slot. Particular emphasis is on shedding light on the origin of the three-dimensionality in the controlled separation bubbles that could ultimately lead to transition.
Bio: Shirzad Hosseinverdi obtained his BS in aerospace engineering from Tehran Polytechnic University in 2010. He started his graduate studies at the University of Arizona in 2011 and earned his MS degree in aerospace engineering in 2014. Shirzad is currently a Ph.D. candidate in the same discipline working as a graduate research assistant at the Computational Fluid Dynamics Laboratory under Professor Hermann Fasel. His scientific contributions have resulted in several publications in prestigious journals such as the Journal of Fluid Mechanics and the Journal of Computational Physics, numerous conference proceedings and presentations. Shirzad is minoring in pplied mathematics under the supervision of Dr. Moysey Brio.