Mean flow
View article: Analysis of Structural Responses of a Horizontal Axis Wind Turbine at Maximum Aerodynamic Performance
Analysis of Structural Responses of a Horizontal Axis Wind Turbine at Maximum Aerodynamic Performance Open
This numerical analysis investigates the interplay between fluid dynamics and structural mechanics within a horizontal axis wind turbine. Tip speeds ranging from 1 to 8.1 are explored, focusing on blade structural responses at maximum aero…
View article: The elliptic–parabolic Patlak–Keller–Segel system and volume-preserving mean curvature flows
The elliptic–parabolic Patlak–Keller–Segel system and volume-preserving mean curvature flows Open
The Patlak–Keller–Segel system of equations (PKS) is a classical example of an aggregation-diffusion equation. It describes the aggregation of some organisms via chemotaxis, limited by some nonlinear diffusion. It is known that for some ch…
View article: Impact of magnetic islands on plasma flow and turbulence in W7-X
Impact of magnetic islands on plasma flow and turbulence in W7-X Open
The effect of magnetic islands on plasma flow and turbulence has been experimentally investigated in the stellarator W7-X. Magnetic configurations with the 5/5 magnetic island positioned at the plasma edge, inside the last closed flux surf…
View article: Wake instability past a sphere settling in a strongly stratified flow
Wake instability past a sphere settling in a strongly stratified flow Open
The wake of a body moving across the isopycnals of a strongly stratified fluid is characterized by the presence of an intense jet which, under certain circumstances, may become unstable. To get insight into the phenomenology of this instab…
View article: Latent-space variational data assimilation in two-dimensional turbulence
Latent-space variational data assimilation in two-dimensional turbulence Open
Starting from limited measurements of a turbulent flow, data assimilation (DA) attempts to estimate all the spatio-temporal scales of motion. Success is dependent on whether the system is observable from the measurements, or how much of th…
View article: Latent-space variational data assimilation in two-dimensional turbulence
Latent-space variational data assimilation in two-dimensional turbulence Open
Starting from limited measurements of a turbulent flow, data assimilation (DA) attempts to estimate all the spatio-temporal scales of motion. Success is dependent on whether the system is observable from the measurements, or how much of th…
View article: A Dynamic Subgrid-Scale Model Based on Liutex Theory for Wall-Bounded Turbulent Flows
A Dynamic Subgrid-Scale Model Based on Liutex Theory for Wall-Bounded Turbulent Flows Open
Accurate subgrid-scale (SGS) modeling remains a major challenge in large eddy simulation (LES), particularly for wall-bounded turbulent flows with strong near-wall anisotropy. This study proposes a novel SGS model based on Liutex theory, f…
View article: Vector Flow Imaging in Layered Models With a High Speed of Sound Contrast Using Pulse-Echo Ultrasound and Photoacoustics
Vector Flow Imaging in Layered Models With a High Speed of Sound Contrast Using Pulse-Echo Ultrasound and Photoacoustics Open
In this study, we develop vector flow imaging techniques for multi-layered models with a high wavespeed contrast using photoacoustic and ultrasonic imaging. We use refraction-corrected delay-and-sum image reconstruction (RC-DAS), which enf…
View article: Vector Flow Imaging in Layered Models With a High Speed of Sound Contrast Using Pulse-Echo Ultrasound and Photoacoustics
Vector Flow Imaging in Layered Models With a High Speed of Sound Contrast Using Pulse-Echo Ultrasound and Photoacoustics Open
In this study, we develop vector flow imaging techniques for multi-layered models with a high wavespeed contrast using photoacoustic and ultrasonic imaging. We use refraction-corrected delay-and-sum image reconstruction (RC-DAS), which enf…
View article: Scaling law for the slow flow of an unstable mechanical system coupled to a nonlinear energy sink
Scaling law for the slow flow of an unstable mechanical system coupled to a nonlinear energy sink Open
In this paper one first shows that the slow flow of a mechanical system with one unstable mode coupled to a Nonlinear Energy Sink (NES) can be reduced, in the neighborhood of a fold point of its critical manifold, to a normal form of the d…
View article: A Dynamic Subgrid-Scale Model Based on Liutex Theory for Wall-Bounded Turbulent Flows
A Dynamic Subgrid-Scale Model Based on Liutex Theory for Wall-Bounded Turbulent Flows Open
Accurate subgrid-scale (SGS) modeling remains a major challenge in large eddy simulation (LES), particularly for wall-bounded turbulent flows with strong near-wall anisotropy. This study proposes a novel SGS model based on Liutex theory, f…
View article: Adjoint Optimization for Hyperloop Aerodynamics
Adjoint Optimization for Hyperloop Aerodynamics Open
This work investigates how the vehicle-to-tube suspension gap governs compressible flow physics and operating margins in Hyperloop-class transport at 10 kPa. To our knowledge, this is the first study to apply adjoint aerodynamic optimizati…
View article: A Statistical Model of Turbulent Flow and Dispersion Based on General Principles of Physics
A Statistical Model of Turbulent Flow and Dispersion Based on General Principles of Physics Open
The traditional way to model the statistics of turbulent flow and dispersion is through averaged conservation equations, in which the turbulent transport terms are described by semi-empirical expressions. A new development has been reporte…
View article: Oceanic internal tides: do they get phased at the Equator?
Oceanic internal tides: do they get phased at the Equator? Open
Low-mode baroclinic tides play a major role in ocean dynamics, especially for energy redistribution and deep ocean mixing. These internal waves, generated by tidal flow over submarine topography, can propagate for thousands of kilometres a…
View article: Different Alternate Bar Dynamics Under Different Channel Width and Flow Conditions
Different Alternate Bar Dynamics Under Different Channel Width and Flow Conditions Open
Alternate bars are highly mobile features that play a critical role in river morphodynamics at the reach scale. Previous studies have highlighted discharge, slope, sediment size, and initial channel width as key factors in their developmen…
View article: Oceanic internal tides: do they get phased at the Equator?
Oceanic internal tides: do they get phased at the Equator? Open
Low-mode baroclinic tides play a major role in ocean dynamics, especially for energy redistribution and deep ocean mixing. These internal waves, generated by tidal flow over submarine topography, can propagate for thousands of kilometres a…
View article: Hydroacoustic Absorption and Amplification by Turbulence
Hydroacoustic Absorption and Amplification by Turbulence Open
Acoustic waves propagating through fluid media are significantly influenced by turbulence. This paper experimentally investigates the influence of underwater turbulence on the propagation characteristics of acoustic waves, revealing that a…
View article: Hydroacoustic Absorption and Amplification by Turbulence
Hydroacoustic Absorption and Amplification by Turbulence Open
Acoustic waves propagating through fluid media are significantly influenced by turbulence. This paper experimentally investigates the influence of underwater turbulence on the propagation characteristics of acoustic waves, revealing that a…
View article: Noise prediction of a controlled diffusion airfoil at high angle-of-attack
Noise prediction of a controlled diffusion airfoil at high angle-of-attack Open
Direct Numerical Simulations (DNS) of the compressible flow over a Controlled Diffusion (CD) airfoil are conducted at a high geometrical angle-of-attack of 15°. To obtain far field noise predictions, the compressible DNS results are couple…
View article: Flux-controlled wall model for large eddy simulation integrating the compressible law of the wall
Flux-controlled wall model for large eddy simulation integrating the compressible law of the wall Open
Recent advances in velocity and temperature transformations have enabled recovery of the law of the wall in compressible wall-bounded turbulent flows. Building on this foundation, a flux-controlled wall model (FCWM) for Large Eddy Simulati…
View article: Flux-controlled wall model for large eddy simulation integrating the compressible law of the wall
Flux-controlled wall model for large eddy simulation integrating the compressible law of the wall Open
Recent advances in velocity and temperature transformations have enabled recovery of the law of the wall in compressible wall-bounded turbulent flows. Building on this foundation, a flux-controlled wall model (FCWM) for Large Eddy Simulati…
View article: Flux-controlled wall model for large eddy simulation integrating the compressible law of the wall
Flux-controlled wall model for large eddy simulation integrating the compressible law of the wall Open
Recent advances in velocity and temperature transformations have enabled recovery of the law of the wall in compressible wall-bounded turbulent flows. Building on this foundation, a flux-controlled wall model (FCWM) for large eddy simulati…
View article: Monotonicity of Perelman $\mathcal{W}$-Entropy of Mean Curvature Flow
Monotonicity of Perelman $\mathcal{W}$-Entropy of Mean Curvature Flow Open
In this paper, we study Perelman' s $ \mathcal{W}$ entropy for mean curvature flow in $\mathbb{R}^{n+1}$. Analogously to Perelman's $\mathcal{W}$-entropy defined for Ricci flow, K. Ecker in \cite{Ecker07} defined a functional $\mathcal{W}$…
View article: Monotonicity of Perelman $\mathcal{W}$-Entropy of Mean Curvature Flow
Monotonicity of Perelman $\mathcal{W}$-Entropy of Mean Curvature Flow Open
In this paper, we study Perelman' s $ \mathcal{W}$ entropy for mean curvature flow in $\mathbb{R}^{n+1}$. Analogously to Perelman's $\mathcal{W}$-entropy defined for Ricci flow, K. Ecker in \cite{Ecker07} defined a functional $\mathcal{W}$…
View article: Dataset to "D4.1 Parameterisation" for the ReZilient project: "Redox-mediated hybrid zinc-air flow batteries for more resilient integrated power systems"
Dataset to "D4.1 Parameterisation" for the ReZilient project: "Redox-mediated hybrid zinc-air flow batteries for more resilient integrated power systems" Open
This repository contains the results for the molecular dynamics simulations described in the report D4.1 Parameterisation for the ReZilient project: "Redox-mediated hybrid zinc-air flow batteries for more resilient integrated power systems…
View article: Dataset to "D4.1 Parameterisation" for the ReZilient project: "Redox-mediated hybrid zinc-air flow batteries for more resilient integrated power systems"
Dataset to "D4.1 Parameterisation" for the ReZilient project: "Redox-mediated hybrid zinc-air flow batteries for more resilient integrated power systems" Open
This repository contains the results for the molecular dynamics simulations described in the report D4.1 Parameterisation for the ReZilient project: "Redox-mediated hybrid zinc-air flow batteries for more resilient integrated power systems…
View article: Formation of turbulent secondary vortex street in absence of vortex shedding instability
Formation of turbulent secondary vortex street in absence of vortex shedding instability Open
This work investigates the formation mechanism of the turbulent secondary vortex street (SVS) which appears in the far wake of bluff bodies, when the (primary) Kármán vortex street is absent. The turbulent wakes of four types of highly por…
View article: Guided-jet waves generated by an acoustic source in a jet at a Mach number of 0.95
Guided-jet waves generated by an acoustic source in a jet at a Mach number of 0.95 Open
The guided-jet waves (GJWs) that may be trapped into a jet are investigated by simulating the propagation of the waves generated by an acoustic source on the axis of a jet at a Mach number of 0.95. The flow is modelled as a cylindrical she…
View article: Evaluating flow-induced damping by solving a perturbation flutter problem
Evaluating flow-induced damping by solving a perturbation flutter problem Open
Flow-induced damping and flutter share a similar mechanical origin related to the energy exchange between a structure and the fluid flowing over it [1]. Whereas the flutter of flags, plates, and filaments has been studied extensively in th…
View article: Sheared flow profile effects on acoustic impedance eduction in small 3D ducts
Sheared flow profile effects on acoustic impedance eduction in small 3D ducts Open
We investigate the influence of sheared grazing flow on acoustic propagation in three-dimensional rectangular ducts. We particularly focus on small ducts typical of most experimental impedance eduction facilities, for which the flow profil…