Dipanjan Majumdar; Chandan Bose ; Sunetra SarkarPhysics of Fluids , under review, 2020.
This study investigates the effect of stochastic inflow fluctuations on the jet-switching characteristics of a harmonically plunging elliptic foil, in comparison to steady- uniform inflow, at a low Reynolds number regime. Numerical simulations are performed with an Immersed Boundary Method (IBM)-based in-house flow solver and the temporal inflow fluctuations are generated by an Ornstein-Uhlenbeck process - a stationary Gauss- Markov process with a chosen correlation function.
Chandan Bose ; Sayan Gupta; Sunetra SarkarJournal of Fluid Mechanics , Revised, 2020.
This study establishes a dynamic link between the near and far-field wake transitions and investigates the role of aperiodic jet-switching in ushering in chaos in the wake of a pitch-plunge flapping system. The mechanism of jet-switching and the role of leading-edge vortex are also revealed in this paper.
Dipanjan Majumdar; Chandan Bose ; Sunetra SarkarJournal of Fluids and Structures , Volume 95, Pages 102999, 2020.
This study explores the scope of body non-conformal mesh methods in comparison to body-fitted approaches in capturing complex flow topologies, especially, during aperiodic transition in the unsteady flow-field of a flapping foil.
Chandan Bose ; Sayan Gupta; Sunetra SarkarInternational Journal of Non-Linear Mechanics , Volume 109, Pages 189 - 203, 2019.
This study reports a Ruelle-Takens-Newhouse quasi-periodic route during the transition from periodic to chaotic dynamics in the fluid-elastic response of a 2-dof flexibly-mounted airfoil with very low solid-to-fluid added mass ratio through robust nonlinear dynamic analysis.
Chandan Bose ; Sunetra SarkarPhysics of Fluids , Volume 30, Issue 4, 047101, 2018.
This study revealed that slightly erratic leading edge separation could trigger a complete chaotic breakdown of the wake of a flapping wing that mimics natural flyers like birds and insects. Fundamental vortex interaction mechanism that sustains chaos in the wake have also been identified in the study.
Chandan Bose ; Sayan Gupta; Sunetra SarkarAIAA Journal , Volume 56, Issue 5, Pages 2062-2069, 2018.
Chandan Bose ; Vikas Reddy; Sayan Gupta; Sunetra SarkarJournal of Computational and Nonlinear Dynamics , Volume 13, Issue 2, 021014, 2017.
S Krishna Kumar; Chandan Bose ; Shaikh Faruque Ali; Sayan Gupta; Sunetra SarkarApplied Physics Letters , Volume 111, Issue 24, 243903, 2017.
Sandeep Badrinath; Chandan Bose ; Sunetra SarkarEuropean Journal of Mechanics/ B-Fluids , Volume 66, Pages 38-59, 2017.