Session: 08-03-01 Risers, Pipelines & VIV- I

Paper Number: 120822

120822 - Active Flow Control of Flow Over a Stationary Cylinder Using an Orbiting Cylinder at Low Reynolds Number 

A numerical investigation of the active flow control mechanism, an orbiting controlling cylinder in wake, of flow over a stationary controlled circular cylinder has been performed in two-dimensional (2D) laminar flow environment. The controlling cylinder is allowed to flip in the wake behind the controlled cylinder to influence the wake dynamics and vortex shedding process. The Petrov-Galerkin Finite Element formulation in Arbitrary Lagrangian-Eulerian (ALE) description is employed to investigate the fluid dynamics and structural motions in the simulations. A dynamic (rotating) mesh algorithm is utilized to precisely trace the structural motions of the controlling cylinder in the wake downstream. A controlling cylinder of very small diameter (d=0.1), as a mean of active flow control mechanism, oscillates in an orbit around in the wake behind a controlled cylinder of large diameter (D=1.0). The fluid flows over the controlled cylinder in 2D laminar flow and manifest a type of fundamental fluid instability, von Karman vortex street due to Hopf bifurcation, downstream. To investigate the effectiveness of this active flow control mechanism, the controlling cylinder oscillates at different frequencies, amplitudes and distances away from the controlled cylinder in different cases. The results show that this active flow control mechanism can effectively change the wake modes downstream and directly influence the vortex shedding process, vortex shedding frequency, lift and drag forces.     

Presenting Author: Bin Liu Newcastle University

Presenting Author Biography: Dr. Bin Liu joined Newcastle University, Singapore campus, as Assistant Professor in Marine and Offshore Technology since Dec 2022. Before joining Newcastle University, he worked as Research Associate in Imperial College London and Postdoctoral Fellow in Nanyang Technological University. He received Bachelor’s Degree (specialisation in Aeronautical Engineering) and Ph.D Degree from Department of Mechanical Engineering in National University of Singapore in 2015 and 2020, respectively. He has years of experience working on finite element methods, fluid-structure interaction, flow control, hydrodynamics stability and heat & mass transfer.

Over the years, he developed a number of highly robust and efficient finite element codes to simulate large-scale three-dimensional multi-physics problems. He published his research in the prestigious engineering journals, e.g., Computer Methods in Applied Mechanics and Engineering, Journal of Computational Physics, Journal of Fluid Mechanics and Physics of Fluids, as the corresponding/first author. He also serves as reviewers in Journal of Fluid Mechanics, Physics of Fluids, Journal of Computational Physics, Journal of Fluid and Structures and Computer & Fluids.

Besides the aforementioned research areas, his current research interests include renewable energy (wind turbine and hydrogen gas turbine), reduced order model and machine learning for fluid dynamics, discontinuous Galerkin methods and turbulence modeling.

Authors:

Ming Han Chua Singapore Institute of Technology
Bin Liu Newcastle University