7 papers
Coherent structures modeling in stenotic transitional flow via resolvent analysis
Alexandre Villié, Simon Demange, Kilian Oberleithner
This study investigates the capability of linear modeling to characterize the transitional dynamics in an axisymmetric stenosis and attempts a low-order representation of the turbu…
Uncovering Turbulent Dynamics in Stenotic Flows from 4D-flow MRI Measurements via Resolvent Analysis and Data Assimilation
Aleaxndre Villié, Alexandre Villié, Simon Demange +3
This study presents a hybrid experimental and computational framework that couples in vitro 4D phase-contrast magnetic resonance imaging (4D-flow MRI) measurements with data assimi…
Spectral analysis of attached and separated turbulent flows over a Gaussian-shaped bump
Roman Klopsch, Lukas M. Fuchs, Georgios Rigas +2
We investigate the broadband turbulent dynamics of attached and separated flows over a Gaussian bump, focusing on the origin of low-frequency coherent structures. The analysis comb…
Impact of perturbed eddy-viscosity modeling on stability and shape sensitivity of the hydro-turbine vortex rope using linearized Reynolds-averaged Navier-Stokes equations
Jens S. Müller, Sophie J. Knechtel, Kilian Oberleithner
This study investigates the influence of a perturbed eddy-viscosity model on linear stability and shape sensitivity of the global vortex rope mode arising in a hydro-turbine flow u…
Standing-Wave Dynamics in Low-Frequency Breathing of a Turbulent Separation Bubble
Lukas M. Fuchs, Ben Steinfurth, Jakob G. R. von Saldern +2
This study investigates the low-frequency dynamics of a turbulent separation bubble (TSB) over a backward-facing ramp, with a focus on large-scale coherent structures associated wi…
Identification of structures driving trailing-edge noise. Part II -- Numerical investigation
Zhenyang Yuan, Simon Demange, Kilian Oberleithner +2
The aim of the present work is to investigate the mechanisms of broadband trailing-edge noise generation to improve prediction tools and control strategies. We focus on a NACA 0012…