Combustion is a reactive oxidation process that releases energy bound in chemical
compounds used as fuels─ energy that is needed for power generation, transportation …

In a thermoacoustic system, such as a flame in a combustor, heat release oscillations couple
with acoustic pressure oscillations. If the heat release is sufficiently in phase with the …

Data assimilation, ie, upgrading a numerical model by using experimental observations, is
applied to adapt the performances of a simulation-based digital twin (DT) of a semi-industrial …

Because of physical assumptions and numerical approximations, low-order models are
affected by uncertainties in the state and parameters, and by model biases. Model biases …

Reduced-order models of flame dynamics can be used to predict and mitigate the
emergence of thermoacoustic oscillations in the design of gas turbine and rocket engines …

Reduced-order models based on level-set methods are widely used tools to qualitatively
capture and track the nonlinear dynamics of an interface. The aim of this paper is to develop …

Thermoacoustic oscillations arise because of the interaction between acoustic waves inside
a duct or a combustion chamber, and heat release rate oscillations at the flame or heater …

In this work, we introduce a new definition of observability for dynamical systems, formulated
on the principles of dynamic optimization. This definition gives rise to the concept of an …

We propose a novel learning-based surrogate data assimilation (DA) model for efficient
state estimation in a limited area. Our model employs a feedforward neural network for …

Thermoacoustic instabilities in turbulent combustors have disastrous consequences and
present notorious challenges in their modeling, prediction, and control. Such instabilities are …