Research Associate in CFD Modelling of Large Diesel Engines
Academic Division: Energy, Fluid Mechanics and Turbomachinery
Research group: Energy
My current postdoc project involves simulating non-premixed combustion in Marine Engines with the objective of reducing pollutants such as soot particles and nitrous oxides. During my PhD, I worked on Direct Numerical Simulations (DNS) of combustion processes in high-intensity turbulent flows, analysing the fundamental changes to the flame structure and propagation brought on by resulting flame-flame interactions. The importance of such analyses is to improve existing combustion processes for cleaner operations. During this time, I also started working independently on a novel simulation technique called the Direct Numerical Monte Carlo (DSMC) method. This technique simulates gas flows at the molecular level and has been the universally-used method of simulating flows associated with spacecraft in the upper atmosphere. We have proved the viability of using the DSMC method for combustion simulations by successfully simulating a one-dimensional hydrogen-air flame.
More recently, I have also translated my research skills towards a project related to the understanding of the spread of COVID by simulating the fluid dynamics of a cough with the focus on how the exhaled droplets travel in space. Based on this research, a paper published in Physics of Fluids received significant press coverage discussing the importance of this work in assessing the social distancing measures.
I have also done experimental work on a heat-recirculating “Swiss Roll” combustor to use it as a micro-scale power generating device. This was accomplished by reforming hydrocarbon fuel into Hydrogen which could then be used in a Fuel Cell. In future, I will pursue research in zero-emission combustion, fuel cells and provide research that could assist the better use of battery technology. Reducing carbon emissions is an imminent need that must be explored in every direction where savings can be made.
- Numerical analysis for soot and NOx in heavy-duty Marine Engines.
- Direct Numerical Simulations (DNS) of flame-flame interaction in premixed turbulent flames.
- Molecular level simulations of combustion processes using the Direct Simulation Monte Carlo (DSMC) method.
- Unsteady simulations of exhaled flow for assessment of safety from COVID-19
I have supervised courses in several areas related to thermofluids including advanced level fluid mechanics, compressible flows, numerical methods, turbomachinery, thermodynamics and concepts of clean energy including fuel cells. I have demonstrated Gas Engines, Wind Tunnel and Dimensional Analysis labs, and supervised undergraduate projects on Flow Visualisation, Turbo-machinery and Power Generation.
Shrey is a postdoctoral research associate working with Prof. Mastorakos on analysing soot and NOx emissions from non-premixed combustion in Marine Engines. This project is funded by Cambridge Advanced Centre for Research and Education in Singapore (CARES) with funding from the National Research Foundation (NRF), Prime Minister’s Office, Singapore.
Department role and responsibilities