Thesis Defense – Aziz Mert Karul (MSME)

Aziz Mert Karul – M.Sc. in Mechanical Engineering

Assoc. Prof. Özgür Ertunç – Advisor

Date: 09.08.2024

Time: 13.00

Location: AB1 246

“3 D Position Optimization of Wind Tunnel Guide Vanes for Achieving Uniform Flow”

Assoc. Prof. Özgür Ertunç, Özyeğin University

Assist. Prof Altuğ M. Başol, Özyeğin University

Assoc. Prof. Nilay Sezer Uzol, Middle East Technical University

Abstract:

This study aims to optimize the placement of guide vanes to achieve a uniform velocity distribution at the wind tunnel corner outlet while minimizing the impact of secondary flow, a critical consideration in fluid dynamics applications. By employing two objective functions that are minimizing the standard deviation of wall shear stress on the outer wall and reducing velocity gradient at the outlet, the research addresses key factors that influence system efficiency and durability. The methodology involved both two-dimensional and three-dimensional simulations. Initially, two-dimensional optimizations were conducted to identify design seeds, which were subsequently employed in more comprehensive three-dimensional analyses. This approach allowed for a thorough investigation of the design domain and used the efficiency of two-dimensional studies to guide the more complex three-dimensional simulations. The findings from these simulations were substantial. The optimized designs demonstrated a marked improvement in flow uniformity and a significant reduction in the impacts of secondary flow when compared to baseline designs. This indicates that strategic placement of guide vanes can effectively streamline the flow, enhancing the overall performance of the system. Moreover, the inclusion of wall shear stress as an optimization parameter was particularly useful. It was observed that optimizing for wall shear stress not only improved the distribution of velocity but also had the added benefit of reducing energy losses. The significance of including wall shear stress alongside velocity uniformity cannot be overstated. These findings have broad applicability across various systems that utilize guide vanes, such as wind tunnels, pipe systems, and other flow regulation devices. Achieving a uniform flow and minimizing secondary effects are paramount for these systems to perform at their best. The insights gained from this study can thus be instrumental in designing more efficient and durable flow systems, contributing to advancements in fields ranging from aerospace engineering to industrial fluid dynamics.

Bio:

Aziz Mert Karul received his B.Sc degree in Mechanical Engineering from Özyeğin University. He is currently pursuing an M.Sc in Mechanical Engineering at Özyeğin University and his research interests are fluid mechanics and computational fluid dynamics.