Flow characteristics of elastically mounted slit cylinder at sub-critical Reynolds number

The present work numerically investigates vortex-induced vibrations (VIV) of a two-dimensional circular cylinder with an axisymmetric slit at Reynolds number 500. study examines the effects shape (i.e., converging, diverging, and parallel slits), effect slit-area ratios, slit-width, its angle freestream velocity on aerodynamic forces, vibration response, associated flow characteristics. results demonstrate that addition assists VIV suppression by adding extra amount to main flow. It in stabilized wake pressure recovery downstream causes reduction lift force over cylinder. Also, there exist different shedding patterns shapes. Proper Orthogonal Decomposition (POD) field suggests among all three slits, heavily modifies behind distributing energy large modes as compared other slits (converging diverging slit), where most is contained couple modes. Further, increasing (for slit) respect increases effectiveness up specific value slit-angle beyond starts affect adversely. Observations for slit-width are also reported from perspective VIV.