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pro vyhledávání: '"Baars, A. J."'
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 rocket nozzle, in which four cameras were set up in a circular configura
Externí odkaz:
http://arxiv.org/abs/2311.10332
Autor:
Baars, Woutijn J., Ragni, Daniele
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 components, while the latter play a role in low-frequency intensity mo
Externí odkaz:
http://arxiv.org/abs/2310.01056
This work explores the dynamic response of a turbulent boundary layer to large-scale reactive opposition control, at a friction Reynolds number of $Re_\tau \approx 2\,240$. A hot-film is employed as the input sensor, capturing large-scale fluctuation
Externí odkaz:
http://arxiv.org/abs/2309.13929
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 relation to the spatio-temporal characteristics of the near-wall velocity and
Externí odkaz:
http://arxiv.org/abs/2308.07776
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--velocity coupling requires investigation to properly design a controller w
Externí odkaz:
http://arxiv.org/abs/2307.06449
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 model (IOIM) (Baars et al., Phys. Rev. Fluids 1 (5), 054406). The IOIM cap
Externí odkaz:
http://arxiv.org/abs/2304.13707
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 well as temperature in a range of stability conditions. These data per
Externí odkaz:
http://arxiv.org/abs/2110.07685
Akademický článek
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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, characterised by self-sustained shock oscillations, induces local uns
Externí odkaz:
http://arxiv.org/abs/1906.08500
Autor:
Baars, Woutijn J., Marusic, Ivan
Publikováno v:
Journal of Fluid Mechanics, Vol. 882, A25, 2020
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 scales. Definite scaling-trends for streamwise spectra have remained empiri
Externí odkaz:
http://arxiv.org/abs/1810.03100