THERMO-AERODYNAMIC PERFORMANCE OF TURBULENT FLOW OVER DIMPLES OF DIFFERENT DESIGNS

Abstract

In this dissertation, Large Eddy Simulation was used to simulate the turbulent channel flow over dimples to investigate the effect of design parameters variation on the thermo-aerodynamic performance. The work focused on three main points as follows: (1) Effect of dimple geometry (shape): In this study, the drag and heat transfer performance has been investigated for five dimple shapes, i.e., circular, elliptical, diamond, and teardrop with vertex heading upstream and downstream. (2) Effect of dimple size: The thermo-aerodynamic performance was investigated over dimples of different sizes at different Reynolds numbers. (3) Effect of dimple edge ratio: The goal of this study is to investigate the effect of the dimple edge ratio variation on drag and heat transfer performance. The aforementioned studies demonstrate the potential of dimples to enhance heat transfer and improve drag performance in turbulent channel flows.