Classification and computation of extreme events in turbulent combustion

M Hassanaly, V Raman - Progress in Energy and Combustion Science, 2021 - Elsevier
In the design of practical combustion systems, ensuring safety and reliability is an important
requirement. For instance, reliably avoiding lean blowout, flame flashback or inlet unstart is …

[HTML][HTML] Chaotic measures as an alternative to spectral measures for analysing turbulent flow

RDJG Ho, D Clark, A Berera - Atmosphere, 2024 - mdpi.com
Turbulence has associated chaotic features. In the past couple of decades, there has been
growing interest in the study of these features as an alternative means of understanding …

Space-time adaptive model order reduction utilizing local low-dimensionality of flow field

T Misaka - Journal of Computational Physics, 2023 - Elsevier
The cost of unsteady flow simulations, such as large eddy simulations, has been increasing
because of the large number of mesh cells and the use of high-order numerical schemes. In …

Ensemble-LES analysis of perturbation response of turbulent partially-premixed flames

M Hassanaly, V Raman - Proceedings of the Combustion Institute, 2019 - Elsevier
The response to small perturbations of the Sandia CH 4/air flame series is studied using a
dynamical systems formulation. Here, the Sandia D and E turbulent partially-premixed …

Lyapunov spectrum of forced homogeneous isotropic turbulent flows

M Hassanaly, V Raman - Physical Review Fluids, 2019 - APS
In order to better understand deviations from equilibrium in turbulent flows, it is meaningful to
characterize the dynamics rather than the statistics of turbulence. To this end, the Lyapunov …

A priori analysis of reduced description of dynamical systems using approximate inertial manifolds

M Akram, M Hassanaly, V Raman - Journal of Computational Physics, 2020 - Elsevier
The treatment of turbulent flows as finite-dimensional dynamical systems opens new paths
for modeling and development of reduced-order descriptions of such systems. For certain …

On the Application of Optimal Control Techniques to the Shadowing Approach for Time Averaged Sensitivity Analysis of Chaotic Systems

RE Gilbert, D Lasagna - SIAM Journal on Applied Dynamical Systems, 2024 - SIAM
Traditional sensitivity analysis methods fail for chaotic systems due to the unstable
characteristics of the linearized equations. To overcome these issues two methods have …

Using approximate inertial manifold approach to model turbulent non-premixed combustion

M Akram, V Raman - Physics of Fluids, 2021 - pubs.aip.org
The theory of inertial manifolds (IM) is used to develop reduced-order models of turbulent
combustion. In this approach, the dynamics of the system are tracked in a low-dimensional …

Computational tools for data-poor problems in turbulent combustion

M Hassanaly, V Raman - AIAA Scitech 2019 Forum, 2019 - arc.aiaa.org
Computational modeling is undergoing a revolution due to the influx of data. In the field of
propulsion and energy conversion systems, data-driven modeling is beginning to emerge as …

Extreme events in turbulent combustion

M Hassanaly - 2019 - deepblue.lib.umich.edu
The design of reliable combustors is a crucial aspect of propulsion and energy production
applications: a faulty engine could cost human lives and millions (if not billions) of dollars. In …