Comparison of Flow Behavior in Saccular Aneurysm Models Using Proper Orthogonal Decomposition

Aneurysms are abnormal ballooning of a blood vessel. Previous studies have shown presence complex flow structures in aneurysms. The objective this study was to quantify the features observed two selected saccular aneurysm geometries over range inflow conditions using Proper Orthogonal Decomposition (POD). For purpose, rigid-wall models were used (i.e., bottleneck factor 1 and 1.6), varied peak Reynolds number (Rep) from 50 270 Womersley (α) 2 5. velocity field data for studied acquired Particle Image Velocimetry (PIV). average PIV measurement showed that model geometry Rep more significant impact on than variations α. POD results method able characteristics between geometries. mode shapes obtained different spatial each scenarios models. energy 80% fluctuating kinetic captured within five modes BF=1.0 scenarios, while they ten BF=1.6. time varying coefficient interplay at highlighting important phases cycle. low-order reconstruction vortical structure either proceeded outward or stayed aneurysm, behavior highly dependent α, Rep, not evident results.