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Rajesh Singh

Rajesh Singh

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352


Dr. Singh is a Post Doctorate RA in the Hydrology Group and has been employed at PNNL since 2017. His experience includes fundamental and applied research in hydrology and hydropower Engineering. His principal areas of expertise are in Fluid Mechanics, computational fluid dynamics, multiphase and turbulent flows. He has more than 10 years’ research experience of CFD application in a wide range of engineering problems such as Mechanical, Hydrology, chemical, biological, aerospace, etc. Prior to join in hydrology group, he was a team member of R&D 100 award winning project Carbon capture simulation initiative. As a member of the Carbon Capture Simulation for Industry Impact (CCSI2), Dr. Singh was working to support development of two-fluid CFD modeling capabilities for CO2 solvent absorption through complex geometries, namely, flow through structured packing. Using Volume of Fluid method (VOF), micro-scale hydrodynamics such as effective mass transfer area holdup and interphase interactions are investigated and subsequently their closure is being developed.

Research Interests

  • Fluid Mechanics, Computational Fluid Dynamics, Multiphase Flows, Turbulent flows and Hydropower

Education and Credentials

  • Ph.D., University of Delaware, Newark, USA
  • M.Tech., Indian Institute of Technology Delhi, India
  • B.E., Rajiv Gandhi Proudyogiki Vishwavidyalaya, Bhopal, India

Affiliations and Professional Service

  • American Physical Society

Awards and Recognitions

  • R&D 100 Award 2016, CCSI Toolset, (team member)
  • Certificate of Outstanding Contribution in Reviewing, Flow Measurement and Instrumentation, 2016
  • University Graduate Fellow, University of Delaware, 2012
  • Elisa Conover Award (Outstanding PhD student in Fluid Mechanics), University of Delaware, 2009

PNNL Publications


  • Singh R.K., C. Wang, and Z. Xu. 2018. "Residence time distribution in a structured packing unit for monitoring aerosol emissions." International Journal of Greenhouse Gas Control 79. PNNL-SA-135050. doi:10.1016/j.ijggc.2018.11.001
  • Singh R.K., J. Bao, C. Wang, and Z. Xu. 2018. Device-scale CFD study for mass transfer coefficient and effective mass transfer area in packed column. PNNL-28161. Richland, WA: Pacific Northwest National Laboratory.
  • Singh R.K., J. Galvin, and X. Sun. 2018. "Multiphase flow studies for microscale hydrodynamics in the structured packed column." Chemical Engineering Journal 353. PNNL-SA-132858. doi:10.1016/j.cej.2018.07.067

Selected Publications


  • Singh R.K., J.E. Galvin, and X. Sun. 2017. "Hydrodynamics of the rivulet flow over corrugated sheet used in structured packings. ” International Journal of Greenhouse Gas Control 64: 87–98. doi: 10.1016/j.ijggc.2017.07.005
  • Singh R.K., J.E. Galvin, G.A. Whyatt, and X. Sun. 2017. “Breakup of a liquid rivulet falling over an inclined plate: identification of a critical weber number.” Physics of Fluids 29, no. 05: 052101. doi: 10.1063/1.4981920


  • Singh R.K., J.E. Galvin, and X. Sun. 2016.“Three dimensional simulation of liquid film flow over an inclined plate: effects of solvent properties and contact angle.” Chemical Engineering Science 142: 244–257. doi: 10.1016/j.ces.2015.11.029


  • Singh, R.K., and K. Sarkar. 2015. “Hydrodynamic interactions between a pair of capsules in a simple shear: effects of viscosity ratio, heterogeneous collision and comparison with drops.” Physical Review–E 92, no. 06: 063029. doi: 10.1103/PhysRevE.92.063029


  • Singh, R.K., X. Li, and K. Sarkar. 2014. “Lateral migration of a capsule in plane shear near a wall.” Journal of Fluid Mechanics 739: 421-443. doi: 10.1017/jfm.2013.624


  • Sarkar, K., and R.K. Singh. 2013. “Spatial ordering due to hydrodynamic interactions between a pair of colliding drops in a confined shear.” Physics of Fluids 25, no. 05: 051702. doi: 10.1063/1.4805082


  • Singh, R.K., and K. Sarkar. 2011. “Inertial effects on the dynamics of a drop in shear and dispersed stresses.” Journal of Fluid Mechanics 683: 149-171.doi: 10.1017/jfm.2011.257


  • Singh, R.K., S.N. Singh, and V. Seshadri. 2010. “CFD prediction of the effects of the upstream elbow fittings on the performance of cone flowmeters.” Flow Measurements and Instrumentation 21, no. 2: 88-97. doi: 10.1016/j.flowmeasinst.2010.01.003
  • Singh, R.K., S.N. Singh, and V. Seshadri. 2010. “Performance evaluation of orifice plate assemblies under non- standard conditions using CFD.” Indian Journal of Engineering and Material Science 17: 397-406. doi:


  • Olapade, P., R.K. Singh, and K. Sarkar. 2009. “Pair-wise interactions between deformable drops in a free shear flow at finite inertia.” Physics of Fluids 21, no. 6: 063302. doi: 10.1063/1.3153905
  • Singh, R.K., and K. Sarkar. 2009. “Effects of viscosity ratio and three dimensional positioning on hydrodynamic interactions between two viscous drops in a shear flow at finite inertia.” Physics of Fluids 21, no. 10: 103303. doi: 10.1063/1.3253351
  • Singh, R.K., S.N. Singh, and V. Seshadri. 2009. “Effect of up-stream swirl on the performance of V-Cone flowmeter using CFD.” Flow Measurements and Instrumentation 20, no. 2: 69-74. doi: 10.1016/j.flowmeasinst.2008.12.003
  • Singh, R.K., S.N. Singh, and V. Seshadri. 2009. “Numerical investigation of S-shaped diffusing duct having both horizontal and vertical offset with circular cross section”, International Journal of Fluid Mechanics and Research 36, no. 4: 375-390. doi:.10.1615/InterJFluidMechRes.v36.i4.60


  • Singh, R.K., S.N. Singh, and V. Seshadri. 2008. “Effect of the corner rounding on the performance of double offset Y-shaped aircraft intake duct.” IMechE Journal, Journal of Aerospace Engineering 222: 969-983. doi: 10.1243/09544100JAERO368
  • Singh, R.K., S.N. Singh, and V. Seshadri. 2008. “Influence of the inlet shape on the performance of double offset transition S-duct.” International Journal of Computational Methods 5, no. 1: 1-19. doi: 10.1142/S0219876208001364
  • Singh, R.K., S.N. Singh, and V. Seshadri. 2008. “Performance characteristics of double offset Y-shape aircraft side intake duct.” Journal of Aircraft 45, no. 4: 1230-1243. doi: 10.2514/1.34137


  • Singh S.N., V. Seshadri, R.K. Singh, and R. Gawhade. 2006. “Effect of upstream flow disturbances on the performance characteristics of a V-cone flowmeter.” Flow Measurement and Instrumentation 17, no. 5:291-297. doi: 10.1016/j.flowmeasinst.2006.08.003.
  • Singh S.N., V. Seshadri, R.K. Singh, and T. Mishra. 2006. “Annular gas turbine combustor;Computational fluid dynamics;Liner holes;Species concentration;Temperature contours." Journal of Scientific and Industrial Research 65: 921-934. doi:
  • Singhal, T., S.N. Singh, S. Mathur, and R.K. Singh. 2006. “Performance optimization for 2-dimenesional rectangular diffuser by momentum injection using CFD.” Journal of Mechanical Engineering Science 220: 1775-1783. doi: 10.1243/0954406JMES364


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