Course

Module-1

Introduction to bluff body flows: factors influencing bluff body flows – boundary layer – flow separation – wake formation-vortex shedding. Flow over stationary isolated circular cylinder: classification of flow regimes based on Re – Laminar states of flow – steady laminar wake- periodic laminarregime, Turbulent states of flow: Transition in wake (TrW) – Transition in shear layers (TrSL) –Transition in boundary layers (TrBL) – Fully Turbulent flow state (T). Vortex shedding: Strouhal number-mechanism-span wise correlation – vortex street formation- mathematical models. Induced forces (lift and drag): effect of Re- flow incidence angle-body surface texture- blockage- free stream turbulence.
Flow over non-circular cylinders–Influence of geometry and Re-flow separation-wake structures
– Vortex shedding and induced forces. FSI in biological systems : blood flow through arteries and veins-diagnosis of diseases.

Module-2

Flow interference between two circular cylinders – tandem, side-by-side and staggered arrangements – classification of interference regimes – effect of spacing – flow patterns and surface pres-sure distribution – biased gap flow – induced forces (lift & drag. Flow over cylinder clusters (multiple cylinders).
Flow interference between non-circular cylinders – influence of Re – body geometry – spacing – differences and similarities with circular cylinders.

Module-3

Flow-induced vibrations (FIV): Influencing factors – body geometry-reduced velocity – free stream turbulence – flow incidence – mass ratio – damping – added mass. Vortex-induced vibration-galloping-flutter-fluid elastic excitation-turbulence buffeting-other types. Flow structures around oscillating cylinders-induced forces and cylinder response-equations of motion-modal analysis, Interference effects in FIV.
Some practical problems: Tube bundle vibrations in heat exchangers and nuclear reactors- Vibrations of stacks and other tall structures, transmission line vibrations. Passive and active control of FIV. Energy extraction from FIV. FIV in Engineering Codes. Experimental measurements, flow visualization techniques

• CO1: Develop fundamental knowledge in FSI
• CO2: Development of capability to analyse fluid flows of different types associated with different engineering situations involving FSI
• CO3: Develop skill to propose solutions to FSI problems and cater to industrial needs
• CO4: Academic capability to conduct research activities in the area of FSI.

1. Robert D. Blevins, Flow-Induced Vibration, 2nd Edition, Van Nostr and Reinhold, NewYork,USA, 1990.
2. E. Naudascher, and D.Rockwell, Flow-Induced Vibrations : An Engineering Guide, Dover publishers, USA, 2005.
3. M.M. Zdravkovich, Flow around circular cylinders,Vol.1 : Fundamentals, Oxford University Press, Oxford, England.1997.
4. M.M.Zdravkovich, Flow around circular cylinders,Vol.2: Applications, Oxford University Press, Oxford, England.1997.
5. Thomson,W.T and Dahleh,M. D.,Theory of vibrations with Applications, Prentice Hall,1997.
6. Rao,S.S., Mechanical Vibrations, Pearson Education,2004.