Final year B.tech seminar

1. Energy Generation from Vortex
Induced Vibrations
Guided by : Mr . Anooplal B
Asst. Professor , Mechanical
Engineering Dept.
St. Joseph’s College of
Engineering and Technology ,
Palai .
Submitted by : Toji Tharakan
S-7, Mechanical
Engineering

2. Contents
 Introduction
 Vortex Induced Vibrations
 Physics Theory
 Energy Harvesting In Liquid Flow
 Vortex Induced Vibration Aquatic Clean Energy (VIVACE)
 Energy harvesting in air flow
 Conclusion
 References

3. Introduction
 Global climate change induce a need for innovative energy
harvesting devices
 drawbacks of turbine generators urges emergence of a new area
energy harvesting from flow induced vibration
 A kind of flow-induced oscillations that can be useful to harvest
energy from a flow is the Vortex-Induced Vibrations (VIV) of a
bluff body

4. VORTEX INDUCED VIBRATIONS
 The vibration caused by a fluid flowing around a body due to
formation of vortices is known as vortex-induced vibration .
 Vortex is a region of spinning motion about an imaginary axis
within a fluid flow
 Vortex-Induced Vibration (VIV) is important mechanical
engineering - considered as an undesirable effect
 We will see that if the vibration is substantial, it can be used to
extract useful energy from the surrounding flow

5. Physics Theory
 Vortex Shedding
• An oscillating flow that takes place when a fluid flows past a
cylindrical body at certain velocities .
• Vortices are created at the back of the body and detach
periodically from either side of the body .
• Alternating vortex shedding is referred as a vortex street
• Dependent on the Reynolds number of the flow

7.  Strouhal Number
• Non-dimensional parameter relates the frequency of vortex
shedding , fS , to the flow conditions .
Strouhal number , S= (D *fs )/U
U is the free stream velocity, and D is the cylinder diameter
 Lock In
• Lock in can result in relatively large amplitudes of forced vibration.
• Similar to linear resonance.
• Increase in vibration amplitudes the natural frequency of the
cylinder is approached by the vortex shedding frequency .

8. Application of Vortex Induced Vibrations
 Electromagnetic energy harvesting
 Vortex Induced Vibrations Aquatic Clean Energy (VIVACE)
 Vortex Shedding Vertical Axis Turbine (VOSTURB)
 Piezoelectric Energy Harvesters

9. Energy Harvesting In Liquid Flow
 Electromagnetic energy harvesting from vibrations .

10. Vortex Induced Vibration Aquatic Clean
Energy (VIVACE)
 The VIVACE converter is a transformational technology.
 It taps into a vast new source of clean and renewable
energy .
 water currents as slow as 2 to 4 knots
(1.02 m/s to 2.05 m/s )
 to conventional turbine technology that target rivers with
water currents greater than 4 knots.

12.  Open water testing in the St. Clair River, at Port Huron, MI in 2011
 Can be used for –
• Supply of electricity to offshore facilities without supplying diesel to generator
sets.
• Replacement for dams without altering the riverine environment.
• Modular VIVACE units could be used and then removed and re-used at another
site.

13. Comparison of VIVACE to other alternative
energy sources

14. Comparison of energy sources
• Comparison is done in terms of cost in $/kWh

15. Energy Harvesting in Air Flow
 Piezoelectric Energy Harvesting
• vertical rigid sail is fixed to a vertically cantilevered piezoelectric
transducer.
• Sail oscillates in a fixed direction when introduced to wind.
• The piezoelectric transducer bends back and forth .
• Thus, through the direct piezoelectric effect,
electricity is produced

16.  Remote Sensing Applications .
• Batteries or long power cords can be eliminated.
• Savings in capital, maintenance, or labour costs.
• Power is either continuously provided to the sensor or stored
in a small battery or capacitor

17. Conclusion
 Energy harvesters from flow-induced vibration, is an
alternative to turbine generators .
 Focus should be to miniaturise these energy harvesters
while maintaining current power level.
 Additional researches should be done to further reduce the
start flow speed to allow this technology wider application

18. References
 1. Dung-An Wang ; Chun-Yuan Chiu and Huy-Tuan Pham ; Electromagnetic
energy harvesting from vibrations induced by Karman vortex street ;
Mechatronics ; Volume 22 ; 2012 ; pages 746–756;
 2. D.A. Wang and K.H Chang ; Electromagnetic energy harvesting from flow
induced vibration ; Microelectronics Journal ; Volume 41 ; 2010 ; pages 356–
364;
 3. Antonio Barrero-Gil ; Santiago Pindado and Sergio Avila ; Extracting
energy from Vortex-Induced Vibrations: A parametric study ; Applied
Mathematical Modelling ; Volume36 ; 2012 ; pages 3153–3160 ;
 4. Michael M. Bernitsas ; Kamaldev. Raghavan ; Y. Ben-Simon ; E. M. H.
Garcia ; VIVACE(Vortex Induced Vibration for Aquatic Clean Energy):A NEW
CONCEPT IN GENERATION OF CLEAN AND RENEWABLE ENERGY FROM FLUID
FLOW ; Journal of Offshore Mechanics and Arctic Engineering ; 2008 ;
 5. Dibin Zhu ; Vibration Energy Harvesting: Machinery ,Vibration, Human
Movement and Flow Induced Vibration ; University of Southampton ,UK .

19.  5. Dibin Zhu ; Vibration Energy Harvesting: Machinery ,Vibration, Human
Movement and Flow Induced Vibration ; University of Southampton ,UK .
 6. Bruder and Brittany Lynn ; Assessment of hydrokinetic renewable energy
devices and tidal energy potential at Rose Dhu Island, GA ; August 2011 .
 7. C.H.K. Williamson ; and R. Govardhan ; A brief review of recent results in
vortex-induced vibrations ; Journal of Wind Engineering and Industrial
Aerodynamics ; Volume 96 ; 2008 ; pages 713–735 .
 8. Philippe Meliga ; Jean-Marc Chomaz ; and Franc -ois Gallaire ; Extracting
energy from a flow: An asymptotic approach using vortex-induced vibrations and
feedback control ; Journal of Fluids and Structures; Volume 27 ; 2011; pages 861–
874 .
 9. Ashwin Vinod ; Amshumaan ; Kashyap ; Arindam Banerjee ; and
JonathanKimball; Augmenting Energy Extraction From Vortex Induced
Vibration Using Strips Of Roughness/Thickness Combination ; Proceedings of the 1st
Marine Energy Technology Symposium , METS13 ; April 10‐11, 2013 ;

20. THANK YOU