Closed-loop turbulence control is a critical enabler of aerodynamic drag reduction, lift
increase, mixing enhancement, and noise reduction. Current and future applications have …

This article reviews linear instability analysis of flows over or through complex two-
dimensional (2D) and 3D geometries. In the three decades since it first appeared in the …

THE field of fluid mechanics involves a range of rich and vibrant problems with complex
dynamics stemming from instabilities, nonlinearities, and turbulence. The analysis of these …

Dynamic mode decomposition (DMD) is an Arnoldi-like method based on the Koopman
operator. It analyzes empirical data, typically generated by nonlinear dynamics, and …

This work studies the application of a reinforcement learning (RL)-based flow control
strategy to the flow past a cylinder confined between two walls to suppress vortex shedding …

The objective of this article is to review some developments in the use of adjoint equations in
hydrodynamic stability theory. Adjoint-based sensitivity analysis finds both analytical and …

Thermoacoustic combustion instability is one of the most challenging operational issues in
several high-performance, low-emissions combustion technologies, including gas turbines …

Coherent features of a turbulent Mach 0.9, Reynolds number jet are educed from a high-
fidelity large eddy simulation. Besides the well-known Kelvin–Helmholtz instabilities of the …

The tandem two-cylinder configuration is frequently employed in engineering structures. Its
fluid force and vortex shedding are significantly greater than those of widely studied single …

This review article addresses the dynamics and control of low-frequency unsteadiness, as
observed in some aerodynamic applications. It presents a coherent and rigorous linearized …