Modal decomposition application to study large-scale flow structures in an aneurysm

Modal decomposition methods such as Proper Orthogonal Decomposition (POD) and dynamic mode decomposition (DMD) have been used to study complex flows and to gain physical insight into the flow phenomena in detail. The study's objective is to use the modal decomposition methods to extract physically important features and understand their impact on the flow in an ideal saccular aneurysms model. An in-house experimental setup was fabricated where a pump system controls the non-dimensional inflow conditions Womersly number (α) and Reynolds number (Re). Velocity measurements in the aneurysm are conducted on the mid-vertical plane using Particle Image Velocimetry (PIV). The modal decomposition results each identified the coherent structures and their spatial and temporal behavior. These modal decompositions reveal complex interactions of the flow structures on the critical fluid flow parameters like impinging locations and wall shear stresses.