| Topic: | DNS research activities at Tokyo Institute of Technology |
|---|---|
| Speaker: | Dr Yuki Minamoto Assistant Professor, Department of Mechanical Engineering, Tokyo Institute of Technology, Japan |
| Date: | Thursday, 6 February 2020 |
| Time: | 10.00am to 11.00am |
| Venue: | Seminar Room EA-06-02   (Block EA, Level 6) (map of NUS can be found at http://map.nus.edu.sg/) |
| Host: | Asst Prof Zhang Huangwei |
Abstract
Two of our recent studies utilizing direct numerical simulations (DNS) will be presented. (i) DNS of turbulent premixed combustion in a constant volume vessel a narrow crevice is performed for methane-air mixtures. Scalar transport from the main combustion chamber into the crevice is initially dominated by the flow of fresh reactants into the crevice due to compression of the reactant’s mixture induced by expansion of the burnt products. This advection process transports the fresh reactants’ mixture and turbulent eddies into the crevice domain well ahead of the flame itself entering the crevice. (ii) Neural Network (NN)-based combustion modelling is developed. While the development, a new feature-scaling method applicable for physical phenomena with a large dynamic range like turbulent combustion is also proposed. The trained NN with conventional and proposed feature scaling methods are compared and tested using DNS database of turbulent premixed planar and V-flames.
About the Speaker
Yuki Minamoto received his B.E. and M.E. from Tokyo Institute of Technology, and Ph.D. from University of Cambridge. After a postdoctoral appointment at the Combustion Research Facility, Sandia National Laboratories, he joined Tokyo Institute of Technology in 2015 as an assistant professor at Department of Mechanical Engineering. His research interests are primarily fundamental aspects of turbulent combustion and combustion devices using direct numerical simulation (DNS). Recent research topic includes flame-wall interaction, flame stabilization in a complex geometry and neural network based modelling for turbulence and turbulent combustion. He is also leading a small team of CFD software development called Flowsquare+ outside of the university duties.