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2023

Identifying invariant solutions of wall-bounded three-dimensional shear flows using robust adjoint-based variational techniques

O. Ashtari; T. M. Schneider

Journal Of Fluid Mechanics

2023-12-12

Vol. 977 , p. A7.

DOI : 10.1017/jfm.2023.927

2023

Identifying invariant solutions of wall-bounded three-dimensional shear flows using robust adjoint-based variational techniques

Symmetry-reduced low-dimensional representation of large-scale dynamics in the asymptotic suction boundary layer

Predicting chaotic statistics with unstable invariant tori

Jacobian-free variational method for computing connecting orbits in nonlinear dynamical systems

2022

Invariant tori in dissipative hyperchaos

Variational methods for finding periodic orbits in the incompressible Navier Stokes equations

Constructing periodic orbits of high-dimensional chaotic systems by an adjoint-based variational method

Non-destructive Prediction of the Buckling Load of Cylindrical Shells

Exploiting Marginal Stability in Slow-Fast Quasilinear Dynamical Systems

2021

Periodic orbits exhibit oblique stripe patterns in plane Couette flow

Superspreading events suggest aerosol transmission of SARS-CoV-2 by accumulation in enclosed spaces

Modified snaking in plane Couette flow with wall-normal suction

A study of the double pendulum using polynomial optimization

Optimal perturbation growth on a breaking internal gravity wave

The effects of Prandtl number on the nonlinear dynamics of Kelvin-Helmholtz instability in two dimensions

2020

Nondestructive Prediction of the Buckling Load of Imperfect Shells

Invariant states in inclined layer convection. Part 2. Bifurcations and connections between branches of invariant states

Invariant states in inclined layer convection. Part 1. Temporal transitions along dynamical connections between invariant states

Interaction and breakup of droplet pairs in a microchannel Y-junction

Buckling instabilities and spatio-temporal dynamics of active elastic filaments

Self-similar invariant solution in the near-wall region of a turbulent boundary layer at asymptotically high Reynolds numbers

Koopman Analysis of Isolated Fronts and Solitons

Invariant solutions underlying small- and large-scale structures in turbulent boundary layers

2019

Origin of localized snakes-and-ladders solutions of plane Couette flow

Rational design of a high-throughput droplet sorter

Exact invariant solution reveals the origin of self-organized oblique turbulent-laminar stripes

Turbulent patterns in wall-bounded shear flows: invariant solutions and their bifurcations

Jumping dynamics of aquatic animals

2018

Distinct transition in flow statistics and vortex dynamics between low- and high-extent turbulent drag reduction in polymer fluids

Computing heteroclinic orbits using adjoint-based methods

High-throughput multiplexed fluorescence-activated droplet sorting

Edge states control droplet breakup in subcritical extensional flows

On Establishing Buckling Knockdowns for Imperfection-Sensitive Shell Structures

3D Boundary Element Simulation of Droplet Dynamics in Microchannels: How Droplets Squeeze Through Constrictions and Move in Electric Fields

2017

Stability Landscape of Shell Buckling

Fully localized post-buckling states of cylindrical shells under axial compression

2016

Spatio-temporal patterns in inclined layer convection

Homoclinic snaking in plane Couette flow: bending, skewing and finite-size effects

Localized travelling waves in the asymptotic suction boundary layer

2015

Infinite geometric frustration in a cubic dipole cluster

Femtosecond-laser hyperdoping silicon in an SF6 atmosphere: Dopant incorporation mechanism

Creating femtosecond-laser-hyperdoped silicon with a homogeneous doping profile

Elastocapillary coalescence of plates and pillars

2014

Turbulence Transition in Shear Flows and Dynamical Systems Theory

Complexity of localised coherent structures in a boundary-layer flow

Comoving frames and symmetry-related motions in parallel shear flows

Long-wavelength instability of coherent structures in plane Couette flow

Turbulent-laminar patterns in plane Poiseuille flow

Secondary instability and tertiary states in rotating plane Couette flow

Studying edge geometry in transiently turbulent shear flows

Increasing Lifetimes and the Growing Saddles of Shear Flow Turbulence

2013

Localized edge states in the asymptotic suction boundary layer

Turbulence Transition in the Asymptotic Suction Boundary Layer

In die richtigen Bahnen lenken – Wie Strömungsfelder komplexe Objekte formen können

Turbulente Muster

Edge states for the turbulence transition in the asymptotic suction boundary layer

2012

Periodic orbits near onset of chaos in plane Couette flow

Turbulenz und Chaos

Sequencing by Hybridization of Long Targets

Localization in transitional shear flows

2011

Algorithm for a Microfluidic Assembly Line

2010

Localized edge states for the transition to turbulence in shear flows

Localized edge states nucleate turbulence in extended plane {Couette} cells

Snakes and Ladders: Localized Solutions of Plane Couette Flow

Eliminating Turbulence in Spatially Intermittent Flows

Folded Edge of Turbulence in a Pipe