Adithya Ramanathan Krishnan

Designing an improved, efficient and simple ventilation system for sewers to tackle hydrogen sulfide gas using CFD.

Develop a mathematical model considering the local interactions between hydrodynamics and the dispersed phase to predict the crystals' final properties (Crystal size distribution, shape, etc.). - Performed the validation of the hydrodynamics in the reactor in COMSOL and OpenFOAM. - Developed an algorithm in Matlab to capture the nucleation and crystal growth kinetics using Population balance equations. - Currently performing the coupling between COMSOL and Matlab to capture the local interactions. - Initiated talks for international collaboration with universities.

Contributed to the development of the in-house CFD code CALIF3S-P2REMICS at the Laboratoire de l'Incendie et des Explosions at IRSN to analyze an important issue concerning the risk of hydrogen hazards. Developed a model aimed at improving the predictive capabilities of RANS approach using explicit algebraic modelling of the turbulent fluxes and extended the model in a continuous hybrid RANS/LES framework. Extension to slightly variable density flows - featuring the most important turbulence-buoyancy coupling was also performed. The preliminary results were satisfactory providing a framework for the further improvement of the model.

The aim of this study was to evaluate the potentialities of Equivalent-Detached Eddy Simulation (E-DES) hybrid RANS/LES method for the simulation of incompressible turbulent flows. Studied and understood the underlying principles of Large Eddy Simulation (LES) and the various hybrid RANS/LES methods - DES, PITM and E-DES. Developments were conducted in the in-house CFD computer code CALIF3S-P2REMICS developed by IRSN and critical analysis of the predictive qualities of the PITM and E-DES approaches were conducted along with a comparison against the RANS and LES calculations. From the preliminary simulations using the k-epsilon E-DES method, the phenomenon of re-laminarization was observed and necessitated the need to understand the use of synthetic turbulence generation methods for hybrid methods.

1. Experimental Investigation of the growth rate of the Ritchmyer-Meshkov (RM) instability after re-shock - Investigated the growth of the RM instability caused by a shock interacting with a density-stratified interface. - Performed experiments in a vertical shock tube. - Flow visualization was performed using the Schlieren technique. Used Matlab for post-processing the data. 2. Windmilling Characteristics of DGEN 380 Turbofan Engine - Performed a comparative study of the various models available in the literature to obtain the performance characteristics of the DGEN 380 Turbofan engine in sub-idle conditions. - Developed a better strategy by theoretically deriving a mathematical model to simulate a particularly extreme operating condition - The windmilling condition. - Used Matlab to numerically solve the model and validated the simulation data with the available experimental data.

- Calculated the Manufacturing Wastage produced per car. - Proposed steps to reduce the amount of waste produced which helped the company getting a ‘Platinum' rating from the Indian Green Building Council (IGBC). - Learned how various accessories are manufactured and assembled, steps involved in quality control, and how to build a better supplier-customer relationship. - Represented Mahindra REVA and visited their suppliers to accomplish the Production Part Approval Process (ASAHI India Glass Ltd, Chennai and Alpha Systems, Bangalore).

- Worked in the engine, suspension, and the rear axle units. - Understood the working of Computer Numerical Control (CNC) machines in the manufacturing of parts used in a Farm Tractor. - Explored the working of the various stages in the main assembly line of a Farm Tractor.

- Understood the manufacturing process of automatic rinsing, filling and capping machines, stainless steel tanks, pet blowing machines and conveyor systems with variable speed drive. - Got a hands-on experience on the use of gear module, teeth and meshing. - Performed foundation marking on platforms to build the automatic rinsing, filling and capping. machines.