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Work experience

Aug 2008Present

Lead Engineer

General Motors Technical Centre India Pvt Ltd

Working in Engine-CAE Department and responsible for use of CFD analysis procedures for performance evaluation of: air induction system, compressor performance, intake manifold mass flow and EGR distribution to cylinders, exhaust manifold, turbocharger performance, engine cooling system and exhaust after-treatment systems.

Additional roles and responsibilities include:

    • Training of new hires on CFD analysis procedures and their application.
    • Mentor for 2 after-treatment CFD analysis procedures, responsible for procedure documentation, continuous improvement and resolution of any issues faced by analysts in other regions (NA & Italy) during execution.
    • DFSS coordinator for Engine-CAE department, responsible for training and coaching team members for identification and execution of new projects using DFSS approach.

Summary of important projects executed:

  • Urea injection and mixing analysis CFD procedure development: Simulation of the Urea injection droplets using Lagrangian Multiphase model, evaporation of droplets and mixing of the species before SCR catalyst brick. Developed model validated with test data for ranking of different designs.
  • Uniform sampling device design for NOx sensor: Worked with production team on snorkel design for NOx sensor so that reading of NOx sensor is close to average SCR exit Nox slip reading. Filed for Defensive Publication of the new snorkel design.
  • Diesel Fuel injection and mixing analysis procedure development: Simulation of diesel injection and its burning in Diesel Oxidation Catalyst to predict the temperature distribution in Diesel Particulate Filter during regeneration. Developed model validated with test data for ranking of different designs.
  • Mixing system design for Pick-up Truck application: Worked with production team for design of mixing system for Urea-SCR and DOC-DPF system using CFD procedures. Optimized a single mixer location and orientation to achieve mixing performance same as two mixer design. Resulted in cost saving and more robust design of system.
  • Close-Coupled Diesel Oxidation performance analysis: CFD model included turbo rotation effect through MRF model for prediction of flow and temperature. 1-D DOC model is used for chemical kinetics and conversion efficiency prediction.
  • Catalyst light-off prediction analysis: Simulation of the time required for catalyst to attain light off temperature. Involved conjugate heat transfer with cylinder head, block, water jacket, cooling system, turbocharger and solid parts of after-treatment system for accurate prediction of cooling of exhaust gas before reaching the catalyst brick.
  • Space saver mixing system design: Worked with production team for design of mixing system for Urea-SCR system with small space available due to packaging constraints. Came up with new innovative mixer design to achieve good mixing within short mixing length. Filed for US Patent protection for this new mixer design.
  • Diesel Engine NOx model for calibration: Working with calibration team for exploring possibilities of data reduction required for creating NOx calibration tables through use of Statistical tools (Kriging Surface and Optimization tools).


Jul 2006Jul 2008

Master of Engineering

Indian Institute of Science

Major: Thermal and fluid sciences; Cumulative GPA:7.4/8.00

Course Project: Experimental study of solidification in electromagnetically stirred semi-solid material processing.

Dissertation: CFD modeling of mold filling and solidification of binary alloy in casting process using the User Defined Function in Fluent (Multiphase VOF model with solidification).


Authored 2 international journal papers and 2 CFD analysis procedure documents for global roll-out in General Motors.
1D CFD Software package
GT-Power used for After-treatment Catalyst Models
CFD Software packages
StarCD, CCM+, Fluent, Gambit
Programming languages
Fortran 77/90 (intermediate), Matlab (intermediate), C, C++ and Java for CCM+ automation tools


Oct 2013Present

Design for Six Sigma - Green Belt

General Motors
Completed 5 Day training and successfully used DFSS approach as Project Leader for development of new CFD procedure for Close-coupled DOC performance evaluation.
Apr 2012Present

Engine Design Course

General Motors
Completed 40 Days class room training over 6 months for engine component design, functional requirements and use of CAE for design evaluation.


  • Yadav, N. Pathak, A. Kumar, P. Dutta and S. Sarkar, “Effects of the filling process on the evolution of the mushy zone and macrosegregation in alloy casting”, Modeling Simul. Mater. Sci. Eng. 17 (2009), Article No. 035006.
  • N. Pathak, A. Yadav, A. Kumar, and P. Dutta, “Effects of Mould Filling on Evolution of the Solid-Liquid Interface during Solidification”, Applied Thermal Engineering Volume 29, Issues 17-18, December 2009, Pages 3669-3678.

Awards and Recognition

  • President’s Honor award (Highest Award in GM-India) for outstanding commitment to C.A.R.S. (Customer focus, Accountability Risk Taking, Speed) for After-treatment CFD procedure development and design suggestions to reduce cost, Feb 2013.
  • Work of Wonder Award for completing analysis work and delivering reports under tight timelines for design approvals, Jun-2012.
  • Work of Wonder Award for development of CFD procedure for Diesel Fuel injection and mixing analysis, Dec-2009.
  • 99.90 percentile score in Graduate Aptitude Test in Engineering (GATE-2006) with All India Rank 22.
  • Gold Medal Award for Bachelor of Engineering by North Gujarat University.