Computational Fluid Dynamics Analysis of Self-Sustained Laminar Flow Oscillations in Singular Grooved Ducts

Research Background: Modeling oscillatory flow in singular grooved ducts within the laminar regime provides insight into fluid mechanics that could enhance applications such as heat transfer in nuclear reactors. Previous research has identified pulsations in grooved channels under turbulent conditions with high Reynolds numbers, contributing to enhanced heat exchange efficiency. These pulsations are influenced by the axial flow in and out of the main channel from a continuous groove. Contribution of This Study: This study extends the understanding of flow oscillations to simpler geometries and lower Reynolds numbers, specifically within a laminar flow regime capped at a Reynolds number of 2,000. By simplifying the duct geometry to a rectangular main channel with a singular continuous groove, the research employs computational fluid dynamics tools, primarily OpenFOAM, facilitated by Compute Canada's clusters. It investigates the fluid flow characteristics—strength, frequency, velocity gradient, and oscillation behaviours—associated with the geometry of the gaps and channels. This approach helps in pinpointing the dependency of flow characteristics on specific geometric configurations, potentially laying groundwork for optimizing designs in practical applications.