73 citations · 236 across the 14 of their papers we have counts for
15 papers
Efficient three-dimensional variational data assimilation of multi-plane PIV data
Uttam Cadambi Padmanaban, Samaresh Midya, Ping He +2
We perform three-dimensional variational data assimilation (3DVar) using a discrete adjoint approach to optimise the time-averaged momentum equations. The experimental data consist…
To stall-cell or not to stall-cell: Variational data assimilation of 3D mean flow past a stalled airfoil
Uttam Cadambi Padmanaban, Craig Thompson, Bharathram Ganapathisubramani +1
The full-field reconstruction of three-dimensional (3D) turbulent flows from sparse experimental measurements remains a significant challenge, particularly for flows exhibiting com…
Assimilating rough features: A data-driven framework to infer rough wall properties from sparse experimental data
Martina Formichetti, Uttam Cadambi Padmanaban, Ping He +2
Surface roughness influences turbulent boundary layers (TBLs) primarily through the roughness function and the equivalent sand-grain roughness height \(k_s\). Direct determi…
Mixed data-source transfer learning for a turbulence model augmented physics-informed neural network
Christian Toma, Bharathram Ganapathisubramani, Sean Symon
Physics-informed neural networks (PINNs) have recently emerged as a promising alternative for extracting unknown quantities from experimental data. Despite this potential, much of…
Searching for Invariant Solutions to Wall-Bounded Flows using Resolvent-Based Optimisation
Thomas Burton, Sean Symon, Davide Lasagna
We present a robust optimisation framework for computing invariant solutions of wall-bounded flows by recasting the Navier-Stokes equations as a variational problem as established…
Three-dimensional variational data assimilation of separated flows using time-averaged experimental data
Uttam Cadambi Padmanaban, Bharathram Ganapathisubramani, Sean Symon
We present a novel framework for assimilating planar PIV experimental data using a variational approach to enhance the predictions of the Spalart-Allmaras RANS turbulence model. Ou…
Effects of fetch length on turbulent boundary layer recovery past a step-change in surface roughness
Martina Formichetti, Dea D. Wangsawijaya, Sean Symon +1
Recent studies focusing on the response of turbulent boundary layers (TBL) to a step-change in roughness have provided insight into the scaling and characterisation of TBLs and the…
Resolvent-Based Optimisation for Approximating the Statistics of a Chaotic Lorenz System
Thomas Burton, Sean Symon, Ati Sharma +1
We propose a novel framework for approximating the statistical properties of turbulent flows by combining variational methods for the search of unstable periodic orbits with resolv…
Resolvent analysis of a swimming foil
Jonathan M. O. Massey, Sean Symon, Bharathram Ganapathisubramani +1
This study employs resolvent analysis to explore the dynamics and coherent structures in the boundary layer of a foil that swims via a travelling wave undulation. A modified NACA f…
Energy transfer in turbulent channel flows and implications for resolvent modelling
Sean Symon, Simon J. Illingworth, Ivan Marusic
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…
Energy transfer mechanisms and resolvent analysis in the cylinder wake
Bo Jin, Sean Symon, Simon J. Illingworth
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…
A tale of two airfoils: resolvent-based modelling of an oscillator vs. an amplifier from an experimental mean
Sean Symon, Denis Sipp, Beverley J. McKeon
The flows around a NACA 0018 airfoil at a Reynolds number of 10250 and angles of attack of alpha = 0 (A0) and alpha = 10 (A10) are modelled using resolvent analysis and limited exp…
The role of parasitic modes in nonlinear closure via the resolvent feedback loop
Kevin Rosenberg, Sean Symon, Beverley J. McKeon
We use the feedback loop of McKeon \& Sharma (2010), where the nonlinear term in the Navier-Stokes equations is treated as an intrinsic forcing of the linear resolvent operator, to…
Coherent structures in the linearized impulse response of turbulent channel flow
Sabarish B. Vadarevu, Simon J. Illingworth, Ivan Marusic
We study the evolution of velocity fluctuations due to an isolated spatio-temporal impulse using the linearized Navier-Stokes equations. The impulse is introduced as an external bo…
On non-normality and classification of amplification mechanisms in stability and resolvent analysis
Sean Symon, Kevin Rosenberg, Scott T. M. Dawson +1
We seek to quantify non-normality of the most amplified resolvent modes and predict their features based on the characteristics of the base or mean velocity profile. A 2-by-2 model…