90 citations · 259 across the 17 of their papers we have counts for
17 papers
Convection velocities and velocity coupling of outer-scaled wall-pressure fluctuations in canonical turbulent boundary layers
Rahul Deshpande, Abdelrahman Hassanein, Woutijn J. Baars
This study shows that the turbulent velocities most strongly correlated with outer-scaled (-scaled) wall-pressure fluctuations beneath a zero-pressure-gradient boundary layer re…
Instantaneous convective heat transfer at the wall: a depiction of turbulent boundary layer structures
Firoozeh Foroozan, Andrea Ianiro, Stefano Discetti +1
We demonstrate the ability to experimentally measure fluctuations of the convective heat transfer coefficient at the wall in a turbulent boundary layer. For this, we measure two-di…
Scaling of wall-pressure--velocity correlations in high Reynolds number turbulent pipe flow
Giulio Dacome, Lorenzo Lazzarini, Alessandro Talamelli +2
An experimental study was conducted in the CICLoPE long-pipe facility to investigate the correlation between wall-pressure and turbulent velocity fluctuations in the logarithmic re…
Measuring time-resolved heat transfer fluctuations on a heated-thin foil in a turbulent channel airflow
Antonio Cuéllar, Enrico Amico, Jacopo Serpieri +4
We present an experimental setup to perform time-resolved convective heat transfer measurements in a turbulent channel flow with air as the working fluid. We employ a heated thin f…
Density Field Reconstruction of an Overexpanded Supersonic Jet using Tomographic Background-Oriented Schlieren
Joachim A. Bron, Woutijn J. Baars, Ferdinand F. J. Schrijer
A Tomographic Background-Oriented Schlieren (TBOS) technique is developed to aid in the visualization of compressible flows. An experimental setup was devised around a sub-scale ro…
Low-Frequency Intensity Modulation of High-Frequency Rotor Noise
Woutijn J. Baars, Daniele Ragni
Acoustic spectra of rotor noise yield frequency-distributions of energy within pressure time series. However, they are unable to reveal phase-relations between different frequency…
Opposition flow control for reducing skin-friction drag of a turbulent boundary layer
Giulio Dacome, Robin Mörsch, Marios Kotsonis +1
This work explores the dynamic response of a turbulent boundary layer to large-scale reactive opposition control, at a friction Reynolds number of . A hot-film…
Inner-scaled Helmholtz resonators with grazing turbulent boundary layer flow
Giulio Dacome, Renko Siebols, Woutijn J. Baars
Response details are presented of small-scale Helmholtz resonators excited by grazing turbulent boundary layer flow. A particular focus lies on scaling of the resonance, in relatio…
Reynolds-number scaling of wall-pressure--velocity correlations in wall-bounded turbulence
Woutijn J. Baars, Giulio Dacome, Myoungkyu Lee
Wall-pressure fluctuations are a practically robust input for real-time control systems aimed at modifying wall-bounded turbulence. The scaling behaviour of the wall-pressure--velo…
Quantifying inner-outer interactions in non-canonical wall-bounded flows
Mogeng Li, Woutijn J. Baars, Ivan Marusic +1
We investigate the underlying physics behind the change in amplitude modulation coefficient in non-canonical wall-bounded flows in the framework of the inner-outer interaction mode…
Scale-dependent inclination angle of turbulent structures in stratified atmospheric surface layers
Xuebo Li, Nicholas Hutchins, Xiaojing Zheng +2
A large-scale spanwise and wall-normal array of sonic anemometers in the atmospheric surface layer is used to acquire all three components of instantaneous fluctuating velocity as…
The large-scale footprint in small-scale Rayleigh-Bénard turbulence
Pieter Berghout, Woutijn Johannes Baars, Dominik Krug
Turbulent convection systems are known to give rise to prominent large scale circulation. At the same time, the `background' (or `small-scale') turbulence is also highly relevant a…
Near wall coherence in wall-bounded flows and implications for flow control
Milad Samie, Woutijn Baars, Amirreza Rouhi +4
Opposition-control of the energetic cycle of near wall streaks in wall-bounded turbulence, using numerical approaches, has shown promise for drag reduction. For practical implement…
Flow dynamics and wall-pressure signature in high-Reynolds number overexpanded nozzle with free shock separation
E. Martelli, L. Saccoccio, P. P. Ciottoli +3
A delayed detached eddy simulation (DDES) of an overexpanded nozzle flow with shock-induced separation is carried out at a Reynolds number equal to 1.7 10^7. The flow unsteadiness,…
Data-driven decomposition of the streamwise turbulence kinetic energy in boundary layers. Part 2. Integrated energy and
Woutijn J. Baars, Ivan Marusic
Scalings of the streamwise velocity energy spectra in turbulent boundary layers were considered in Part 1. A spectral decomposition analysis provided a means to separate out attach…
Data-driven decomposition of the streamwise turbulence kinetic energy in boundary layers. Part 1. Energy spectra
Woutijn J. Baars, Ivan Marusic
In wall-bounded turbulence, a multitude of coexisting turbulence structures form the streamwise velocity energy spectrum from the viscosity- to the inertia-dominated range of scale…
Vertical Coherence of Turbulence in the Atmospheric Surface Layer: Connecting the Hypotheses of Townsend and Davenport
Dominik Krug, Woutijn J. Baars, Nicholas Hutchins +1
Statistical descriptions of coherent flow motions in the atmospheric boundary layer have many applications in the wind engineering community. For instance, the dynamical characteri…