Publications

• Rajesh Ranjan, Daniel Garmann, Datta Gaitonde. Compressibility Effects on Flow Behind a Simulated Transport Aircraft Fuselage. AIAA Aviation 2021

• Rajesh Ranjan, Aryan Sharma, Mahendra Verma. Characterization of the Second Wave of COVID-19 in India. Current Science. 2021

• Qiong Liu, Datta Gaitonde, Rajesh Ranjan. Global stability analysis of flow behind an upswept aftbody. AIAA Journal (Accepted)

• Parshwanath Doshi, Rajesh Ranjan, Datta Gaitonde. Global and Local Modal Characteristics of Supersonic Open Cavity Flows. Under Review (Physical Review Fluids)

• Rajesh Ranjan, Datta Gaitonde, J.-Ch. Robinet. Instability mechanism of meandering streamwise vortex pairs in upswept afterbodies. (In submission)

• Rajesh Ranjan, J.-Ch. Robinet, Datta Gaitonde. Characterization and low-order modeling of meandering vortices in the wake of a simulated cargo aircraft. (In submission)

• Rajesh Ranjan. A Robust Mortality Model and Estimation of Excess COVID-19 Mortality in India through Subnational Data (In submission)

• Geetam Saha, Rajesh Ranjan. Transition modelling for flow separation in low-pressure turbine cascades (Accepted, FMFP 2021)

• M V Nitya, Rajesh Ranjan. Numerical investigation of transitional flows over NACA 0012 Airfoil (Accepted. FMFP 2021)

• Pranjal Anand, Rajesh Ranjan. Aerothermal Predictions of High-Pressure Turbine Flows Using RANS Methods (Accepted for ICTACEM 2021)

• Shruti Rajpara, Rajesh Ranjan. RANS modeling for short and long separation bubbles in flow past low-pressure turbine cascades (Accepted for ICTACEM 2021)

• Study of COVID-19 vaccines efficacies using Monte-Carlo Simulation Model. Aryan Sharma, Vimal Kumar, Himanshu Singh, Rajesh Ranjan, Mahendra Verma (In preparation)

Peer-reviewed Journals & PREPRINTS

Turbomachinery Flows

1. Rajesh Ranjan, S M Deshpande, Roddam Narasimha. New insights from high-resolution compressible DNS studies on an LPT blade boundary layer. Computers & Fluids 153 (2017) pp. 49–60. DOI: 10.1016/j.compfluid.2017.05.004

2. Rajesh Ranjan, Roddam Narasimha. An assessment of the two-Layer quasi-laminar theory of Relaminarization through recent high-Re accelerated turbulent boundary layer experiments. Journal of Fluids Engineering 139.11 (2017) p. 111205. DOI: 10.1115/1.4037059

3. Rajesh Ranjan, S M Deshpande, Roddam Narasimha. A high-resolution compressible DNS study of flow past a low-pressure gas turbine blade. Chapter in Advances in Computation, Modeling and Control of Transitional and Turbulent Flows (2016) pp. 291–301. DOI: 10.1142/9789814635165_0028

4. Kishore Singh Patel, NH Maruthi, Rajesh Ranjan, S M Deshpande, Roddam Narasimha. A critical comparison of DNS versus model results on an HPT turbine blade. Journal of Aerospace Sciences and Technologies, Aeronautical Society of India 71 (2019) pp. 219–224

5. Rajesh Ranjan. Prediction of separation and transition on a low-pressure turbine blade using a RANS grid. arXiv

Applied Aerodynamics

6. Rajesh Ranjan, Matthew Aultman, Datta Gaitonde. Mean Flowfield Evolution with Upsweep Angle in a Simulated Cargo Fuselage Aftbody. Journal of Aircraft (2020). DOI:10.2514/1.C035860

7. Rajesh Ranjan, Datta Gaitonde. Hysteresis in Slanted-Base-Cylinder Afterbody Flows. Aerospace Science & Technology (2020) 106. pp.106138. DOI:10.1016/j.ast.2020.106138

8. Abhishek Khare, Raashid Baig, Rajesh Ranjan, Stimit Shah, S Pavithran, Kishor Nikam, Anutosh Moitra. Computational Simulation of Flow Over a High Lift Trapezoidal Wing. International Journal of Aerospace Innovations 1.4 (2009) pp. 189–199. DOI: 10.1260/175722509790291572

9. Rajesh Ranjan, Datta V Gaitonde, J.-Ch. Robinet. Meandering dynamics of streamwise vortex pairs in afterbody flows (Under review. Journal of Fluid Mechanics). Link

Stability, Transition & Flow Control

10. Rajesh Ranjan, S. Unnikrishnan, Datta Gaitonde. A Robust Approach for Stability Analysis of Complex Flows Using High-order Navier-Stokes Solvers. Journal of Computational Physics (2019) 403, pp.109076. DOI: 10.1016/j.jcp.2019.109076

11. Logan P Riley, Rajesh Ranjan, Datta V Gaitonde. Spectral Content in a Supersonic BackwardFacing Step Flow. Journal of Spacecrafts & Rockets (2020). DOI:10.2514/1.A34890

12. Rajesh Ranjan, S. Unnikrishnan, J.-Ch. Robinet, Datta Gaitonde. Global transition dynamics of flow in a lid-driven cubical cavity. Theoretical & Computational Fluid Dynamics (2021). DOI: 10.1007/s00162-021-00565-z

COVID-19 Modeling

13. Rajesh Ranjan.Temporal Dynamics of COVID-19 Outbreak and Future Projections: A Data-driven Approach. Transactions of Indian National Academy of Engineering (2020), pp.1-7. DOI:10.1007/s41403-020-00112-y

14. Rajesh Ranjan. COVID-19 Spread in India: Dynamics, Modeling, and Future Projections. Journal of Indian Statistical Association (2020) 58. pp. 47-65. Link

15. Rajesh Ranjan. Predictions for COVID-19 outbreak in India using Epidemiological models. medRxiv, 2020. DOI:10.1101/2020.04.02.20051466

16. Rajesh Ranjan. Estimating the Final Epidemic Size for COVID-19 Outbreak using Improved Epidemiological Models. medRxiv, 2020. DOI:10.1101/2020.04.12.20061002

INternational Conference Proceedings

1. Parshwanath Doshi, Rajesh Ranjan, Qiong Liu, Emma Gist, Datta Gaitonde, Mark Glauser. Toward a Passive Control Strategy for a Supersonic Multi-Stream Flow using Resolvent Analysis. AIAA SciTech 2021 Forum.

2. Rajesh Ranjan, J.-Ch. Robinet, Datta Gaitonde. Meandering of longitudinal wake vortices in slanted base afterbody flows. AIAA SciTech 2020 Forum. AIAA paper 2020-1532. DOI:10.2514/6.20201532

3. Matthew Aultman, Rajesh Ranjan, Datta Gaitonde. Effect of upsweep angle on the mean flow of a simulated cargo fuselage. AIAA SciTech 2020 Forum, AIAA paper 2020-1323. DOI:10.2514/6.20201323

4. Parshwanath Doshi, Rajesh Ranjan, Datta Gaitonde. 2D and 3D Stability of cavity flows in high Mach number regimes. ASME International Mechanical Engineering Congress and Exposition (IMECE) 2019. DOI:10.1115/IMECE2019-10828.

5. Logan P Riley, Rajesh Ranjan, Datta Gaitonde. Unsteadiness in a Supersonic Backward-Facing Step Flow. AIAA Aviation 2019 Forum. AIAA paper 2019-3343. DOI: 10.2514/6.2019-3343

6. Logan P Riley, Rajesh Ranjan, Datta Gaitonde. Unsteady scales of a supersonic backward-facing step flow via perturbation analysis. AIAA Scitech 2019 Forum. AIAA paper 2019-1910. DOI: 10.2514/6.2019-1910

7. Rajesh Ranjan, S. Unnikrishnan, Datta Gaitonde. On the Use of Mean Flow Perturbation for Global Stability Analysis. AIAA Aviation 2018 Forum. AIAA paper 2018-3378. DOI: 10.2514/6.20183378

8. Rajesh Ranjan, S. M. Deshpande, Roddam Narasimha. Direct numerical simulation of compressible flow past a low pressure turbine blade at high incidence. ASME 2014 4^th Joint US-European Fluids Engineering Division Summer Meeting (2014). DOI: 10.1115/FEDSM2014-21773

9. Rajesh Ranjan, S. M. Deshpande, Roddam Narasimha. Numerical methodology for simulating flows over turbine blades. 14^th Asian Congress of Fluid Mechanics, 2013. Link

10. Rajesh Ranjan, Abhishek Khare, Stimit Shah, Kishor Nikam, Anutosh Moitra. Viscous Flow Analysis of a Twin-engine Commercial Transport Aircraft in High Lift Landing Configuration. 29^th AIAA Applied Aerodynamics Conference (2011). AIAA paper 2011-3011. DOI: 10.2514/6.2011-3011

11. Abhishek Khare, Raashid Baig, Rajesh Ranjan, Stimit Shah, S Pavithran, Kishor Nikam, Anutosh Moitra. Computational Simulation of Flow Over a High Lift Trapezoidal Wing. IISc Centenary International Conference and Exhibition on Aerospace Engineering (ICEAE), May 18-22, 2009

National Conference Proceedings

1. Kishore Singh Patel, N.H. Maruthi, Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. A critical comparison of DNS versus model results on an HPT blade for a small engine. 20^th AeSI CFD Symposium, 2018

2. Kishore Singh Patel, Rajesh Ranjan, N.H. Maruthi, S.M. Deshpande, Roddam Narasimha. Predictions of aero-thermal loading on an HPT stator blade of a typical small turbofan engine. 19^th AeSI CFD Symposium, 2017

3. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. A Critical Comparison of RANS, LES, Hybrid LES/RANS and DNS Studies of the Flow Past a Low Pressure Turbine Blade in a Cascade. 18^th AeSI CFD Symposium, 2016

4. Rajesh Ranjan, B.R. Rakshith, S.M. Deshpande, Roddam Narasimha. A RANS Study of Optimal Low-Drag Wings for Tractor Propeller-driven Aircraft. Proceedings of 7^th Symposium on Applied Aerodynamics And Design of Aerospace Vehicles (SAROD), 2015

5. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. The Effects of Curvature on the Turbulent Boundary Layer in Flow Past Turbine Blades. 16^th AeSI CFD Symposium, 2014

6. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. DNS of flow past LPT blades. 15^th AeSI CFD Symposium, 2013

7. Sagar Deshpande, Raashid Baig, Rajesh Ranjan, Kishor Nikam, Rajendra Lagu. CFD Simulations of Horizontal Axis Wind Turbine (HAWT) Blades for Variation with Wind Speed. 2^nd National Conference CFD Applications in Power and Industry Sectors, 2009. Link

CONFERENCES & SYMPOSIA

1. Rajesh Ranjan, Datta Gaitonde. Unsteady Dynamics of Upswept-Base-Cylinder Afterbody Flows. APS-DFD 2020.

2. Parshwanath Doshi, Rajesh Ranjan, Datta Gaitonde. Stability Characteristics of Open Cavities at High Mach Numbers. APS-DFD 2020

3. Parshwanath Doshi, Rajesh Ranjan, Datta Gaitonde. An Investigation on the Stability of LidDriven Cavity Flows at High Mach Numbers. 44th Dayton-Cincinnati Aerospace Sciences Symposium (DCASS). Dayton, Ohio, March 2019. 44DCASS-144 (Best Presentation Award)

4. N. H. Maruthi, Rajesh Ranjan, S. M. Deshpande, Roddam Narasimha, S. R. Thejaswi, Bharatkumar Sharma. Performance of a Compressible DNS code on latest GPU architectures. NVIDIA GPU Technology Conference (GTC) 2019, 2019, San Jose, USA

5. N. H. Maruthi, Rajesh Ranjan, S. M. Deshpande, Roddam Narasimha, Bharatkumar Sharma, S. R. Thejaswi. GPU-acceleration of an unstructured compressible DNS code for realistic applications. NVIDIA GPU Technology Conference (GTC) 2018, 2018, San Jose, USA

6. N. H. Maruthi, Rajesh Ranjan, S. M. Deshpande, Roddam Narasimha, Bharatkumar Sharma, S. R. Thejaswi. GPU Acceleration of a DNS code for Gas Turbine Blade Simulations. Computational Science Symposium, 2017. Bengaluru, India (Best Paper Award)

7. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. Quasi-laminar theory for Relaminarization in a high-Re highly accelerated turbulent flow. 8^th European Postgraduate Fluid Dynamics Conference, Warsaw, Poland, 2016

8. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. ANUROOP: A new computational tool for tackling the ‘Fluid-dynamical Zoo’ that resides on a gas-turbine blade. JNCASR In-House Symposium, JNCASR, Bengaluru, 2015 (Best Poster Award)

9. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. Understanding flow past a Low pressure turbine blade. TWAS ROCASA Regional Conference of Young Scientists on Recent Trends in Physical and Biological Sciences, JNCASR, Bengaluru, 2014

10. Rajesh Ranjan, S.M. Deshpande, Roddam Narasimha. Flow past a gas turbine blade as seen by DNS. Fluids Days, IISc, Bengaluru, 2013

11. R. Ranjan, A. Singh, K. Nikam, U. Goldberg, O. Peroomian, V. Gupta, S. Chakravarthy. Numerical prediction capability of current-generation CFD technology/codes for high-lift configurations. 1^st AIAA CFD High Lift Prediction Workshop (HiLIFTPW-1) (Associated with the 28th AIAA Applied Aerodynamics Conference), 2010, Chicago, IL

12. R. Ranjan, A. Singh, A. Khare, K. Nikam, U. Goldberg, O. Peroomian, V. Akdag, V. Gupta, S. Chakravarthy. Prediction of drag for wing-body-horizontal configurations representative of transonic transport prediction of drag for wing-body- horizontal configurations representative of transonic transport. 4^th AIAA CFD Drag Prediction Workshop, 2009. San Antonio, TX

13. Gopal Shinde, Abhishek Khare, Rajesh Ranjan, Stimit Shah. NASA Trapezoidal wing CFD simulations for lift and drag predictions and scalability benchmarks on EKA. Symposium on Promotion of Indigenous CFD in Engineering Sciences (SPICES09). 2009, Pune, India

ThesEs & REports

1. Rajesh Ranjan, G. Prasanna, Abhijat Phand, Vinayender Kuchana, Arunesh Chandra. Conceptual design of a twin-engine turboprop passenger aircraft . IISc Flight Vehicle Design Course Report, 2006. DOI:10.13140/RG.2.1.3319.5763

2. Rajesh Ranjan. Modeling and Simulation of a Lifted Flame. ME Thesis, IISc, Bangalore, 2007. DOI:10.13140/RG.2.1.2316.0564

3. Rajesh Ranjan. Compressible DNS studies of the boundary layer on a low-pressure turbine blade at high incidence. PhD Thesis, JNCASR, Bangalore, 2016. DOI:10.13140/RG.2.1.2578.2003