Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Illingworth, Simon J."'
Autor:
Ding, Jitong, Illingworth, Simon J.
We design a nonlinear estimator for channel flows at $Re_{\tau}=180$ and $590$. The nonlinear estimator uses a linear estimator structure based on the linearised Navier-Stokes equations and explicitly calculates the nonlinear forcing from the estimat
Externí odkaz:
http://arxiv.org/abs/2408.12827
We investigate nonlinear energy transfer for channel flows at friction Reynolds numbers of $Re_{\tau}=180$ and $590$. The key feature of the analysis is that we introduce a new variable, which quantifies the energy transferred from a source mode to a
Externí odkaz:
http://arxiv.org/abs/2408.05062
The predictions of resolvent analysis for turbulent channel flow are evaluated for a friction Reynolds number of Retau = 550. In addition to the standard resolvent operator with kinematic viscosity, a resolvent operator augmented with the Cess eddy v
Externí odkaz:
http://arxiv.org/abs/2205.11216
We consider estimation and control of the cylinder wake at low Reynolds numbers. A particular focus is on the development of efficient numerical algorithms to design optimal linear feedback controllers when there are many inputs (disturbances applied
Externí odkaz:
http://arxiv.org/abs/2105.04927
We consider linear feedback control of the two-dimensional flow past a cylinder at low Reynolds numbers, with a particular focus on the optimal placement of a single sensor and a single actuator. To accommodate the high dimensionality of the flow we
Externí odkaz:
http://arxiv.org/abs/2103.16802
Publikováno v:
Phys. Rev. Fluids 6, 024702 (2021)
Energy transfer mechanisms for vortex shedding behind a 2D cylinder at a Reynolds number of Re=100 are investigated. We first characterize the energy balances achieved by the true cylinder flow -- both for the flow as a whole and for each of its most
Externí odkaz:
http://arxiv.org/abs/2004.14534
We analyse the inter-scale transfer of energy for two types of plane Poiseuille flow: the P4U exact coherent state of Park and Graham (2015) and turbulent flow in a minimal channel. For both flows, the dominant energy-producing modes are streamwise-c
Externí odkaz:
http://arxiv.org/abs/2004.13266
An investigation of optimal feedback controllers' performance and robustness is carried out for vortex shedding behind a 2D cylinder at low Reynolds numbers. To facilitate controller design, we present an efficient modelling approach in which we util
Externí odkaz:
http://arxiv.org/abs/1909.04865
We consider linear feedback flow control of the largest scales in an incompressible turbulent channel flow at a friction Reynolds number of Re$_{\tau}$ = 2000. A linear model is formed by linearizing the Navier-Stokes equations about the turbulent me
Externí odkaz:
http://arxiv.org/abs/1906.07462
Publikováno v:
Phys. Rev. Fluids 5, 023901 (2020)
This paper considers single-sensor estimation of vortex shedding in cylinder wakes at $Re=100$ in simulations and at $Re=1036$ in experiments. A model based on harmonic decomposition is developed to capture the periodic dynamics of vortex shedding. T
Externí odkaz:
http://arxiv.org/abs/1905.00133