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Feedback control of unstable steady states of flow past a flat plate using reduced-order estimators
We present an estimator-based control design procedure for flow control, using reduced-
order models of the governing equations linearized about a possibly unstable steady state …
order models of the governing equations linearized about a possibly unstable steady state …
[کتاب][B] Transport barriers and coherent structures in flow data: advective, diffusive, stochastic and active methods
G Haller - 2023 - books.google.com
Transport barriers are observed inhibitors of the spread of substances in flows. The
collection of such barriers offers a powerful geometric template that frames the main …
collection of such barriers offers a powerful geometric template that frames the main …
Exact theory of unsteady separation for two-dimensional flows
We use a dynamical systems approach to extend Prandtl's steady separation criterion to two-
dimensional unsteady flows with no-slip boundaries. Viewing separation profiles as non …
dimensional unsteady flows with no-slip boundaries. Viewing separation profiles as non …
Optimal control of mixing in Stokes fluid flows
Motivated by the problem of microfluidic mixing, optimal control of advective mixing in Stokes
fluid flows is considered. The velocity field is assumed to be induced by a finite set of …
fluid flows is considered. The velocity field is assumed to be induced by a finite set of …
Finite-time Lagrangian transport analysis: stable and unstable manifolds of hyperbolic trajectories and finite-time Lyapunov exponents
We consider issues associated with the Lagrangian characterisation of flow structures
arising in aperiodically time-dependent vector fields that are only known on a finite time …
arising in aperiodically time-dependent vector fields that are only known on a finite time …
Drag reduction of a bluff body using adaptive control methods
A classical actuator is used to control the drag exerted on a bluff body at large Reynolds
number (R e= 20000). The geometry is similar to a backward-facing step whose separation …
number (R e= 20000). The geometry is similar to a backward-facing step whose separation …
Detecting vortex formation and shedding in cylinder wakes using Lagrangian coherent structures
The wake behind a circular cylinder is studied to investigate the complex vortex shedding
physics in the near-wake region. Both the Q criterion and a Lagrangian coherent structure …
physics in the near-wake region. Both the Q criterion and a Lagrangian coherent structure …
Direct Lyapunov exponent analysis enables parametric study of transient signalling governing cell behaviour
Computational models aid in the quantitative understanding of cell signalling networks. One
important goal is to ascertain how multiple network components work together to govern …
important goal is to ascertain how multiple network components work together to govern …
DG-FTLE: Lagrangian coherent structures with high-order discontinuous-Galerkin methods
We present an algorithm for the computation of finite-time Lyapunov exponent (FTLE) fields
using discontinuous-Galerkin (dG) methods in two dimensions. The algorithm is designed to …
using discontinuous-Galerkin (dG) methods in two dimensions. The algorithm is designed to …
Tracking coherent structures in massively-separated and turbulent flows
Coherent vortex structures are tracked in simulations of massively-separated and turbulent
flows. Topological Lagrangian saddle points are found using intersections of the positive …
flows. Topological Lagrangian saddle points are found using intersections of the positive …