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Dr. Ajith Kumar R.

Professor, Mechanical Engineering, School of Engineering, Amritapuri

Qualification: PhD, Post-Doc Fellowships
r_ajithkumar@am.amrita.edu
ORCID Profile
Google Scholar Profile
Scopus Id
Research Interest: Fluid Structure Interaction, Turbomachines, Vortex flows, Desalination, Solar Air Heaters
Date of Joining: 18/12/2008
Nature of Association: Contract

Bio Publications Workshop Membership Recognitions
Bio

Dr. Ajith Kumar R. currently serves as Professor at the Department of Mechanical Engineering at Amrita School of Engineering, Amritapuri. Dr. Ajith Kumar received his M Tech and Ph. D. from IIT, Madras. He also pursued his post-doctoral research studies at Kyungpook National University, South Korea and University of Michigan, Ann Arbor.
He has reviewed many articles of the following journals.

1. Journal of Experimental Thermal and Fluid Science
2. Mechanical Systems and Signal Processing
3. Journal of Sound and Vibration
4. Journal of Vibration & Control
5. Journal of Recent Patents on Mechanical Engineering
6. Journal of Fluids & Structures
7. Ocean Engineering
8. European Journal of Part B/Fluids
9. Journal of Wind Engineering and Industrial Aerodynamics
10. Journal of Ocean Engineering and Marine Energy

Publications

Journal Article

Year : 2024

Flow structures around a square cylinder: Effect of Corner Chamfering

Cite this Research Publication : Flow structures around a square cylinder: Effect of Corner Chamfering, C. M. Hariprasad,R. Ajith Kumar, Jason Dahl, Chang Hyun Sohn. ASCE Journal of Aerospace Engineering 2024 (Acceptedand in press)

Year : 2024

Exergetic performance assessment of a download solar air heater with impinging air jets-An experimental study

Cite this Research Publication : Exergetic performance assessment of a download solar air heater with impinging air jets-An experimental study, Harikrishnan M, R Ajith Kumar, Dani Percy, Rajesh Baby, S. Ajith Kumar,Case Studies in Thermal Engineering 2024 (Accepted and in press)

Year : 2024

An experimental investigation to assess the thermal performance of a sensible storage based-downward solar air heater

Cite this Research Publication : An experimental investigation to assess the thermal performance of a sensible storage based-downward solar air heater, Harikrishnan M, R Ajith Kumar, Rajesh Baby, S. Ajith Kumar. Experimental Heat Transfer 2024 (Accepted and in press).

Year : 2023

Air core vortexing in liquid draining tanks: Influence of surface roughness

Cite this Research Publication : Air core vortexing in liquid draining tanks: Influence of surface roughness Prabhu, M. , Nair, R.R. , Ajith Kumar, R. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2023, 237(2), pp. 350–358

Year : 2023

New Parameter to Characterize Rankine Vortex Formation in Liquid Draining Tanks

Cite this Research Publication : New Parameter to Characterize Rankine Vortex Formation in Liquid Draining Tanks Prabhu, M., Remadevi, H.M. , Kumar, R.A. , Sadasivan, A.L. , Deshpande, P. Journal of Spacecraft and Rockets, 2023, 60(4), pp. 1256–1267

Year : 2023

Analytical models for critical heights of vortexing in flat and spherical bottom tanks with siphon and bottom drains

Cite this Research Publication : Analytical models for critical heights of vortexing in flat and spherical bottom tanks with siphon and bottom drains, Nageswaran, G., Prabhu, M., Anil Lal, S., Kumar, R.A.Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2023, 237(16), pp. 3743–3752

Year : 2023

An experimental investigation on upward solar air heater with impinging air jets

Cite this Research Publication : Harikrishnan, M., Ajithkumar, R., Ajithkumar, S., Baby, R. "An experimental investigation on upward solar air heater with impinging air jets", Journal of Mechanical Science and Technology, 2023, 37(1), pp. 501–509

Year : 2022

Negative emission power plants: Techno-economic analysis of a biomass-based integrated gasification solid oxide fuel cell/gas turbine system for power, heat, and biochar co-production—part 2

Cite this Research Publication : Negative emission power plants: Techno-economic analysis of a biomass-based integrated gasification solid oxide fuel cell/gas turbine system for power, heat, and biochar co-production—part 2 Jaiganesh, N. , Kuo, P.-C. , Champatan, V. , ... Kumar, R.A. , Aravind, P.V. Frontiers in Energy Research, 2022, 10, 826227. https://doi.org/10.3389/fenrg.2022.826227

Publisher : Frontiers

Year : 2022

Negative Emission Power Plants: Thermodynamic Modeling and Evaluation of a Biomass-Based Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine System for Power, Heat, and Biochar Co-Production—Part 1

Cite this Research Publication : Negative Emission Power Plants: Thermodynamic Modeling and Evaluation of a Biomass-Based Integrated Gasification Solid Oxide Fuel Cell/Gas Turbine System for Power, Heat, and Biochar Co-Production—Part 1. N. Jaiganesh, Po-Chih Kuo , Theo Woudstra, R. Ajith Kumar and P. V. Aravind. Frontiers in Energy Research 10:803756. DOI: 10.3389/fenrg.2022.803756

Year : 2022

Rankine Vortex Formation in Cylindrical Tanks with Curved Base: An Experimental Investigation

Cite this Research Publication : Rankine Vortex Formation in Cylindrical Tanks with Curved Base: An Experimental Investigation Harish, S. , Hariharan, S.K. , Shajahan, A. , ... Prabhu, M. , Ajith Kumar, R. Journal of Spacecraft and Rockets, 2022, 59(5), pp. 1781–1786

Year : 2022

Drag reduction for flow past a square cylinder through corner chamfering

Cite this Research Publication : Drag reduction for flow past a square cylinder through corner chamfering Nawaz, M.A. , Abubaker, M. , Kumar, R.A. , Sohn, C.-H. Journal of Mechanical Science and Technology, 2022, 36(11), pp. 5501–5510

Year : 2022

Flow over Flat and Curved Plates: A Flow Visualization Study

Cite this Research Publication : Murali, D., Kumar Raghavan, A., Kumar Sasidharanpillai, A. "Flow over Flat and Curved Plates: A Flow Visualization Study", Journal of Aerospace Engineering, 2022, 35(4), 04022045

Year : 2021

Experimental Investigation of Effect of Winglets on the Aerodynamic Performance of a Mini UAV

Cite this Research Publication : Experimental Investigation of Effect of Winglets on the Aerodynamic Performance of a Mini UAV Deshpande, P. , Vikraman, A. , Anand, S. , ... Suraj, C.S. , Ajith Kumar, R. Journal of Aerospace Engineering, 2021, 34(1), 04020089

Year : 2021

Rankine vortex suppression in tanks with conical base: A numerical investigation

Cite this Research Publication : Rankine vortex suppression in tanks with conical base: A numerical investigation Prabhu, M. , Sreenath, K. , Ajith Kumar, R. , Jayakumar, J.S. , Joshy, P.J. Journal of Spacecraft and Rockets, 2021, 58(2), pp. 326–333

Year : 2020

Rankine vortex formation during draining: A new twin port suppression strategy

Cite this Research Publication : Rankine vortex formation during draining: A new twin port suppression strategy Prabhu, M. , Kumar, R.A. , Gopikrishnan, T.H. , ... Kiran, A.S. , Govindu, R.P. Journal of Applied Fluid Mechanics, 2020, 13(1), pp. 147–160

Year : 2019

Liquid draining through polygonal ports: An investigation on gas entraining vortices

Cite this Research Publication : Liquid draining through polygonal ports: An investigation on gas entraining vortices Prabhu, M. , Kumar, R.A. , Nair, R.R. , Anith, T.A. Journal of Spacecraft and Rockets, 2019, 56(5), pp. 1651–1657

Year : 2017

Vortex Formation during Draining from Cylindrical Tanks: Effect of Drain Port Eccentricity

Cite this Research Publication : A. R. Kumar, Nair, R. R., Prabhu, M., and Dr. Srikrishnan A. R., “Vortex Formation during Draining from Cylindrical Tanks: Effect of Drain Port Eccentricity”, Journal of Aerospace Engineering, vol. 30, 2017.

Publisher : Journal of Aerospace Engineering

Year : 2016

Suppression of vortex-induced vibrations of rigid circular cylinder on springs by localized surface roughness at 3×104≤Re≤1.2×105 Park

Cite this Research Publication : Suppression of vortex-induced vibrations of rigid circular cylinder on springs by localized surface roughness at 3×104≤Re≤1.2×105 Park, H. , Ajith Kumar, R. , Bernitsas, M.M. Ocean Engineering, 2016, 111, pp. 218–233

Year : 2015

A PIV study of the near wake flow features of a square cylinder: influence of corner radius

Cite this Research Publication : A PIV study of the near wake flow features of a square cylinder: influence of corner radius.Kumar, R.A. , Sohn, C.H. , Gowda, B.H.L. Journal of Mechanical Science and Technology, 2015, 29(2), pp. 527–541

Publisher : Journal of Mechanical Science and Technology

Year : 2014

Effect of Dissimilar Leading Edges on the Flow Structures Around a Square Cylinder

Cite this Research Publication : Arunkumar Kumaran Nair, R Ajith Kumar, Hariprasad Chakkalaparambil Many, . “Effect of dissimilar leading edges on the flow structures around a square cylinder”,. ASME Pressure Vessels and Piping Conference (2014). 46018, V004T04A028.

Publisher : ASME 2014 Pressure Vessels and Piping Conference

Year : 2013

Enhancement of flow-induced motion of rigid circular cylinder on springs by localized surface roughness at 3×104≤Re≤1. 2×105 Park

Cite this Research Publication : H. Park, R Kumar, A., and Bernitsas, M. M., “Enhancement of flow-induced motion of rigid circular cylinder on springs by localized surface roughness at 3$\times$ 10 4≤ Re≤ 1.2$\times$ 10 5”, Ocean Engineering, vol. 72, pp. 403–415, 2013.

Publisher : Ocean Engineering

Year : 2012

Selective Roughness in the Boundary Layer to Suppress Flow-Induced Motions of Circular Cylinder at 30,000 ‹ Re ‹ 120,000

Cite this Research Publication : Selective Roughness in the Boundary Layer to Suppress Flow-Induced Motions of Circular Cylinder at 30,000

Year : 2012

Selective Roughness in the Boundary Layer to Suppress Flow-Induced Motions of Circular Cylinder at 30,000

Cite this Research Publication : Ha Park, Bernitsas, M. Mab, and Kumar, Rbc Ajith, “Selective Roughness in the Boundary Layer to Suppress Flow-Induced Motions of Circular Cylinder at 30,000

Publisher : Journal of Offshore Mechanics and Arctic Engineering

Year : 2011

VIV and galloping of single circular cylinder with surface roughness at 3.0×104≤Re≤1.2×105 Chang

Cite this Research Publication : VIV and galloping of single circular cylinder with surface roughness at 3.0×104≤Re≤1.2×105 Chang, C.-C. , Ajith Kumar, R. , Bernitsas, M.M. Ocean Engineering, 2011, 38(16), pp. 1713–1732

Year : 2011

VIV and galloping of single circular cylinder with surface roughness at 3.0×10 4≤Re≤1.2×10 5

Cite this Research Publication : C. - Ca Chang, Kumar, Rab Ajith, and Bernitsas, M. Mac, “VIV and galloping of single circular cylinder with surface roughness at 3.0×10 4≤Re≤1.2×10 5”, Ocean Engineering, vol. 38, pp. 1713-1732, 2011.

Publisher : Ocean Engineering

Year : 2009

Influence of corner radius on the near wake structure of a transversely oscillating square cylinder

Cite this Research Publication : Influence of corner radius on the near wake structure of a transversely oscillating square cylinder,Kumar, R.A. , Sohn, C.H. , Gowda, B.H.L. Journal of Mechanical Science and Technology, 2009, 23(9), pp. 2390–2416

Year : 2009

Safety analysis on a vibrating prismatic body: A data-mining approach

Cite this Research Publication : Va Sugumaran, Kumar, Rab Ajith, Gowda, B. H. Lb, and Sohn, C. Hb, “Safety analysis on a vibrating prismatic body: A data-mining approach”, Expert Systems with Applications, vol. 36, pp. 6605-6612, 2009.

Publisher : Expert Systems with Applications

Year : 2008

Decision tree: A very useful tool in analysing flow-induced vibration data

Cite this Research Publication : Decision tree: A very useful tool in analysing flow-induced vibration data.Kumar, R.A. , Sugumaran, V. , Gowda, B.H.L. , Sohn, C.H. Mechanical Systems and Signal Processing, 2008, 22(1), pp. 202–216

Year : 2008

Interference excitation of a square section cylinder

Cite this Research Publication : Interference excitation of a square section cylinder.Ajith Kumar, R. , Gowda, B.H.L. , Sohn, C.H. Journal of Mechanical Science and Technology, 2008, 22(3), pp. 599–607

Year : 2007

Some flow visualization studies around an oscillating square cylinder

Cite this Research Publication : Some flow visualization studies around an oscillating square cylinder.Kumar, R.A. , Gowda, B.H.L. Journal of Flow Visualization and Image Processing, 2007, 14(2), pp. 155–170

Year : 2006

Flow-induced vibration of a square cylinder without and with interference

Cite this Research Publication : Flow-induced vibration of a square cylinder without and with interference.Kumar, R.A. , Gowda, B.H.L. Journal of Fluids and Structures, 2006, 22(3), pp. 345–369

Year : 2006

Flow-induced oscillations of a square cylinder due to interference effects

Cite this Research Publication : Flow-induced oscillations of a square cylinder due to interference effects Gowda, B.H.L. , Kumar, R.A. Journal of Sound and Vibration, 2006, 297(3-5), pp. 842–864

Year : 2005

Flow visualization studies around a stationary and oscillating square cylinder with and without interference

Cite this Research Publication : Flow visualization studies around a stationary and oscillating square cylinder with and without interference.Kumar, R.A. , Gowda, B.H.L. Journal of Flow Visualization and Image Processing, 2005, 12(3), pp. 215–249

Year : 1996

Interference effects on the flow induced vibrations of a square cylinder in side-by-side arrangement

Cite this Research Publication : Lakshmana Gowda, B.H and R. Ajith Kumar, Interference effects on the flow induced vibrations of a square cylinder in side-by-side arrangement, Journal ofAeronautical Society of India,1996, 48, pp. 63-68

Workshop
  • Organising Secretary: FMFP-2017, Amrita Vishwa Vidyapeetham, Amritapuri Campus
  • Conference Session Chair: (a) 6th International and 43rd National Conference on Fluid Mechanics & Fluid Power, December 15-17, 2016, MNNIT, Allahabad (Chaired Sessions). (b) National Conference LAMSYS-2016, June 24-25, ISRO, Sriharikota (Co-Chaired Sessions).
Membership
  • Life Member, Aeronautical Society of India
  • Life Member, Fluid Mechanics and Fluid Power Society of India
  • Life Member, SIESRP.
  • ASME Member (Membership to be renewed)
Recognitions

Awards

  • Best Paper Award: For the paper titled ‘Design and Characterisation of propellers for fixed wing mini UAV’, 44th National Conference on Fluid Mechanics and Fluid Power (FMFP 2017), December 14th -16th, 2017, Amrita Vishwa Vidyapeetham, Amritapuri Campus, Kerala, India. (authored by Rahul Vishwam, Parag Deshpande, Roshan Antony and R Ajith Kumar.
  • Best Thesis Award (for guided M Tech Thesis): For the M Tech project guided titled ‘Effect of corner radius on aeroelastic instabilities of square section cylinders’ in the year 2008 by the Indian Society of Wind Engineering.

Conferences

  • Aerodynamic Characteristics of an Inclined Square Cylinder with Corner Fins Amith, D. , Sarath Mohan, C. , Hariprasad, C.M. , Ajith Kumar, R. Lecture Notes in Mechanical Engineering, 2024, pp. 19–29
  • Fluid–Structure Interaction Analysis in an Atherosclerosis Carotid Artery Pillai, G.M. , Jayakumar, J.S. , Kumar, R.A. Lecture Notes in Mechanical Engineering, 2022, pp. 23–35
  • Vortex Formation in Liquid Columns During Draining: Influence of Drain Port Geometry Harikrishnan, M.R. , Prabhu, M. , Ajith Kumar, R. Lecture Notes in Mechanical Engineering, 2021, pp. 477–485
  • Aerodynamic Characteristics of a Square Cylinder: Effect of Dissimilar Leading Edges Nair, A.S. , Kumar, S.A. , Kumar, K.A. , Kumar, R.A. Lecture Notes in Mechanical Engineering, 2021, 29, pp. 189–197
  • Vortex Formation During Liquid Draining from a Cylindrical Tank with Conical Bottom—A Numerical Study Sreenath, K. , Prabhu, M. , Ajith Kumar, R. , Jayakumar, J.S. , Joshy, P.J. Lecture Notes in Mechanical Engineering, 2021, pp. 83–93
  • Effect of selectively applied surface roughness and wake splitter plate on the aerodynamic characteristics of a circular cylinder Sivadas, S. , Kumar, K.A. , Ajith Kumar, R. Lecture Notes in Mechanical Engineering, 2019, pp. 697–705
  •  Flow around curved plates at low subcritical reynolds number: Investigation of wake characteristics Anil, A. , ArunKumar, K. , Ajith Kumar, R. , Hariprasad, C.M. , Mani, T. Lecture Notes in Mechanical Engineering, 2019, pp. 811–819
  • Vortexing behaviour during draining of a liquid through two unequally eccentric drain ports in cylindrical tanks Kiran, S. , Warrier, R. , Mouli, B.S.N.V. , Harisankar, S. , Ajith Kumar, R. Lecture Notes in Mechanical Engineering, 2019, pp. 669–678
  • Mixing studies in turbulent oxy-methane jets with and without reaction Tamal, J. , Srikrishnan, A.R. , Deependran, B. , Ajith Kumar, R. Lecture Notes in Mechanical Engineering, 2019, pp. 707–718
  • Effect of corner-arc on the flow structures around a square cylinder Many, H.C. , Srinivasan, V.C. , Raghavan, A.K. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, 2018
  • Vortexing during draining through twin drain ports in a cylindrical tank Gopikrishnan, T.H. , Anandakrishnan, U. , Kiran, A.S. , Ajith, K.R. , Anith, T.A. 2nd International Conference for Convergence in Technology, I2CT, 2017, January, pp. 325–330
  • Flow past a curved plate: Wake vortex characteristics Murali, D. , Balu, H.K.H. , Arunkumar, K. , Ajith Kumar, R, 2nd International Conference for Convergence in Technology, I2CT, 2017, January, pp. 318–324
  • Aerodynamic characteristics of a square section cylinder: Effect of corner arc Chandar, S.V. , Sarath, R.S. , Ajith Kumar, R. 2nd International Conference for Convergence in Technology, I2CT, 2017, January, pp. 814–819
  • Combined Effect of Surface Roughness and Wake Splitter Plate on the Aerodynamic Characteristics of a Circular Cylinder Saisanthosh, I. , Arunkumar, K. , Ajithkumar, R. , Srikrishnan, A.R. IOP Conference Series: Materials Science and Engineering, 2017, 234(1), 012007
  • Numerical analysis of effects of turbine blade tip shape on secondary losses Sarath, R.S. , Ajith Kumar, R. , Prasad, B.V.S.S.S. , Srikrishnan, A.R. Lecture Notes in Mechanical Engineering, 2017, pp. 871–879
  • Interference between a square and a circular cylinder Kumar, N.S. , Kumar, R.A. , Mohan, J. ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015
  • Near-wake flow structures of a corner-chamfered square cylinder at higher harmonic excitations Aswathy, M.S. , Amrita, K.K. , Hariprasad, C.M. , Kumar, R.A. ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015, 2015,
  • CFD analysis to investigate the effect of vortex generators on a transonic axial flow compressor stage Rajendran, A.K. , Shobhavathy, M.T. , Kumar, R.A. ASME 2015 Gas Turbine India Conference, GTINDIA 2015, 2015
  • · Effect of corner cut on the near wake flow structures of a square cylinder Many, H.C. , Yashwanth, N. , Bhardwaj, H. , Kumar, R.A. , Gowda, B.H.L. ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis, ESDA 2014, 2014, 2
  • Effect of dissimilar leading edges on the flow structures around a square cylinder Nair, A.K. , Kumar, R.A. , Many, H.C. American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, 2014, 4
  • Multi-cylinder Flow-Induced Motions: Enhancement by Passive Turubulence Control at 28,000<Re<120,000 Kim, E.S. , Bernitsas, M.M. , Kumar, R.A. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering – OMAE, 2011, 7, pp. 249–260
  • Selective roughness in the boundary layer to suppress flow-induced motions of circular cylinder at 30,000<Re<120,000 Park, H. , Bernitsas, M.M. , Kumar, R.A. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering – OMAE, 2011, 7, pp. 715–724
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