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Seminar on "Interaction dynamics of upstream vortex with vibrating tandem circular cylinder" - 24 September 2018

Date and Venue Information:
24 September 2018, Seminar Hall, 9:30 AM, Department of Mechanical Engineering

Title of Seminar:
"Interaction dynamics of upstream vortex with vibrating tandem circular cylinder" by Ravi Chaithanya Mysa

Abstract
Sustained oscillations whose frequency lower than the shedding frequency are absent in an isolated circular cylinder as shown in Figure 1(a) subjected to steady and uniform ow. If the circular cylinder is immersed in a wake from an upstream circular cylinder as shown in Figure 1(b), sustained oscillations are observed in the circular cylinder coupled response. Generally these oscillations are characterized by large amplitudes with frequency lower than the shedding frequency. Understanding the mechanism of the sustained oscillations will help in designing a suppression device. The seminar talk is divided into two parts. The rst part focuses on the numerical investigation of the local unsteady characteristics of transverse wake-induced vibration of an elastically mounted downstream circular cylinder in a tandem arrangement at subcritical Reynolds number regime of 5000 ≤ Re ≤ 10000. Of particular interest is to study the interaction of freely vibrating downstream cylinder with upstream vortices and the role of stagnation point movement in the transverse load generation over the downstream cylinder. Through the vorticity contours and pressure distribution, the upstream vortex interaction with the vibrating downstream cylinder during the oscillation cycle of wake excitation is investigated. In the second part, a sucient condition for the sustained oscillations of a circular cylinder is derived based on angle of incidence due to velocity of the cylinder and angle of incidence due to vertical velocity of the incoming ow. Numerical experiments are performed for the circular cylinder mounted on a spring with constant horizontal velocity and oscillating vertical ow at the inlet. It is found that the energy is supplied from the ow to the cylinder with sustained oscillations when the sucient condition is satis ed.
For more details cleck here.
 
Brief Profile:
Dr. Ravi Chaithanya Mysa is currently a scientist in Institute of High Performance Computing, A*STAR, Singapore. His areas of interests are in fluid-structure interactions, Ship Hydrodynamics, Adjoint CFD Optimization. Dr. Ravi has completed his bachelor degree in Mechanical Engineering Department from University College of Engineering, Osmania Unviersity in 2003. His M.Tech. (2005) and Ph.D. (2014) degrees are from IT (IIT)-BHU and Indian Institute of Science Bengaluru, respectively. Dr. Ravi worked at National University of Singapore as research fellow from March 2014 to January 2016. He also worked as Scientist/Engineer in Indian Space Research Organisation from January 2005 to July 2006. He has published in reputed journal such as Journal of Fluid Mechanics, Journal of Fluids and Structures, Computers and Fluids, etc.