9. Effect of gusty inflow on the jet-switching characteristics of a plunging foil

Dipanjan Majumdar; Chandan Bose ; Sunetra Sarkar

Physics 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.

8. Dynamic interlinking between near and far-field wakes behind a pitching-plunging airfoil

Chandan Bose ; Sayan Gupta; Sunetra Sarkar

Journal 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.

7. Capturing the Dynamical Transitions in the Flow-field of a Flapping Foil using Immersed Boundary Method

Dipanjan Majumdar; Chandan Bose ; Sunetra Sarkar

Journal 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.


6. Transition to chaos in the flow-induced vibration of a pitching-plunging airfoil at low Reynolds numbers : Ruelle-Takens-Newhouse scenario

Chandan Bose ; Sayan Gupta; Sunetra Sarkar

International Journal of Non-Linear Mechanics , Volume 109, Pages 189 - 203, 2019.

DOI: 10.1016/j.ijnonlinmec.2018.11.012.

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.


5. Investigating chaotic wake dynamics past a flapping airfoil and the role of vortex interactions behind the chaotic transition

Chandan Bose ; Sunetra Sarkar

Physics of Fluids , Volume 30, Issue 4, 047101, 2018.

DOI: 10.1063/1.5019442.

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.

4. Dynamical behaviour of unsteady flow-field of an elastically mounted flapping airfoil

Chandan Bose ; Sayan Gupta; Sunetra Sarkar

AIAA Journal , Volume 56, Issue 5, Pages 2062-2069, 2018.

DOI: 10.2514/1.J056664



3. Transient and stable chaos in dipteran flight inspired flapping flight

Chandan Bose ; Vikas Reddy; Sayan Gupta; Sunetra Sarkar

Journal of Computational and Nonlinear Dynamics , Volume 13, Issue 2, 021014, 2017.

DOI: 10.1115/1.4038447.


2. Investigations on a vortex induced vibration based energy harvester

S Krishna Kumar; Chandan Bose ; Shaikh Faruque Ali; Sayan Gupta; Sunetra Sarkar

Applied Physics Letters , Volume 111, Issue 24, 243903, 2017.

DOI: 10.1063/1.5001863.


1. Identifying the route to chaos in the flow past a flapping airfoil

Sandeep Badrinath; Chandan Bose ; Sunetra Sarkar

European Journal of Mechanics/ B-Fluids , Volume 66, Pages 38-59, 2017.

DOI: 10.1016/j.euromechflu.2017.05.012


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