Research Projects

Pulsatile flows are time-periodic flows with a periodic variation of velocity with time, and this project aims to develop a fundamental understanding of flow transition in fluid-porous configurations. These flows have applications across geophysical, industrial, and biological scenarios, such as in the biological context of patients suffering from cardiac problems due to atherosclerosis. Non-laminar flow patterns appear in blood flow for patients with atherosclerosis, even for Reynolds number Re as low as 400. The project will analyze pulsatile flows using both modal and non-modal linear stability elements. Non-modal analysis is important as it can predict the early onset of flow transition (subcritical transition) that cannot be obtained from traditional modal analysis. Existing literature has attempted non-modal analysis only recently for understanding instability in fluid-porous systems. Building on existing expertise in studying non-modal flow instability in non-Newtonian fluid-porous systems, the project aims to conduct a detailed study regarding the effect of flow pulsation towards non-modal flow stability on such systems. The computational investigations will be backed by experimental studies to better explain the patterns of subcritical transition. In summary, the project aims to provide essential know-how regarding the interplay of fluid rheology, flow pulsation, and porous layer in influencing flow instability.