Visiting Professor from U. of Brussels, Dr. Alessandro Parente, will give a seminar on modeling of turbulent reacting flows. Below are the details. All are welcome to attend!

When: Friday, Jan 31 at 10AM
Where: 380 INSCC

Reduced-order modelling of turbulent reacting flows

Turbulent reacting flows are relevant for several industrial applications, including combustion. Within this context, the availability of predictive numerical simulation tools is of paramount importance to help understanding the physics of the problem and support the development of novel technologies, i.e. efficient and non-polluting combustion technologies.
The simulation of non-equilibrium reacting flows is generally very demanding from a computational perspective. This is due to the large number of species and reactions involved in the problem as well as to the stiffness of the chemical systems (spanning a wide range of time-scales). Novel approaches for chemistry reduction have been developed within the ATM department, using Principal Component Analysis, which allow preserving high accuracy at a lower cost, by limiting the problems degrees of freedom to the most energy-carrying ones.

A priori and a posteriori testing of PCA-based combustion models has been performed for a wide range of configurations, including simple batch and perfectly stirred reactors, one-dimensional flames and complex cases such as flame-vortex interaction, turbulent jet flames as well as plasma flows. Results indicated that PCA-based models are able to provide very accurate results when compared to full size simulations. Moreover, It is shown that the principal components obtained from simple systems can be employed for simulating more complex ones, indicating a relative invariance of the chemical manifold. This represents a very attracting feature of the models, which can be built from inexpensive simulations.