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Flow
Scopus
ISSN 2633-4259 · Cambridge University Press · 126 articles in the index
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Journal Article
Data-driven modelling for on-demand flow prescription in fan-array wind tunnels
Fan-array wind tunnels are an emerging technology to prescribe wind fields through grids of individually controllable fans. This design is especially suited for the turbulent, dynamic, non-uniform flow conditions found close to the ground, and has enabled applications from entomology to flight on…
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Journal Article
Unsteady three-dimensional interaction between propeller tip vortices and a downstream turbulent boundary layer
This study quantifies the viscous interaction between propeller tip vortices and a turbulent boundary layer developing over a semi-elliptic leading-edge plate, located downstream. The experimental wind-tunnel set-up is designed to be representative of the tractor–propeller–wing configuration. Using…
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Journal Article
Design and experiment of a novel vertical axis wind turbine with adaptive Darrieus–Savonius hybrid blades
Wind energy is a sustainable and plentiful form of clean energy. The vertical axis wind turbine (VAWT) is one type of cost-effective, acoustically quieter and lightweight turbines. The two mainstream types of VAWTs – Darrieus (lift type) and Savonius (drag type) – have contradictory strengths and…
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Journal Article
Flow over a cylinder with a small triangular bump
The surface pressure distribution over a circular cylinder with a small, full-span, triangular bump is examined. The geometry of the bump is an isosceles triangle, the height of which is varied from 1.33 % to 5.33 % of the diameter of the cylinder and positioned between $60^{\circ }$ and…
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Journal Article
Coherent Rayleigh–Brillouin scattering: influences of intermolecular potentials and chirp rates
Chirped coherent Rayleigh–Brillouin scattering (CRBS) is a flow diagnostic technique that offers high signal-to-noise ratios and nanosecond temporal resolution. To extract information of dilute gas flow, experimental spectra must be compared with theoretical predictions derived from the Boltzmann…
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Journal Article
Interpretable latent modelling of canopy geometry for aerodynamic drag inference
We develop a data-driven approach to infer aerodynamic drag directly from canopy geometry by learning interpretable low-dimensional latent representations of canopy configurations, without resolving the flow field. A PixelCNN-based variational autoencoder with latent disentanglement regularisation…
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Journal Article
Biglobal input–output analysis of separated flow over a periodic hill
This paper performs a biglobal input–output analysis of the separated flow over a periodic hill to understand the flow sensitivity to disturbances. We use the volume penalty method to model the solid body of the periodic hill, which is implemented in a spectral solver to obtain the two-dimensional…
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Journal Article
Unsteady loss mechanisms in a boundary layer ingestion fan under inlet distortion
Boundary layer ingestion (BLI) propulsion can improve aircraft aerodynamic efficiency, but also introduces inlet distortion that affects fan flow and stability. This study investigates the resulting unsteady flow response and loss mechanisms by performing a parallel comparison of unsteady…
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Journal Article
Coupled analytical modelling of long-wave radiation and convection in rooms to enable better prediction of the thermal stratification
Indoor environments are continuously subject to the effects of thermal radiation: short-wave radiation that brings in solar heat, and long-wave radiation that acts to redistribute heat. However, the effects of the latter are often overlooked. To fully understand and predict the effects of long-wave…
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Journal Article
Regime boundary for bubble-swarm dispersion in subsea gas releases
Subsea gas releases can produce visible surface patches whose size is much larger than the stochastic lateral wandering of individual bubbles during ascent. This distinction is important when laboratory measurements of bubble-swarm dispersion are extrapolated to environmental releases. Here we…
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Journal Article
Clustering the flow: a data-driven framework for pattern discovery in fluid dynamics
Clustering techniques provide a powerful framework for analysing complex flow dynamics while reducing computational costs in large-scale simulations. In this work, we propose a clustering-based approach using vector quantisation principal component analysis (VQPCA) to identify structural…
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Journal Article
Diffusiophoresis and diffusioosmosis in a junction device with a long microchannel: colloid dynamics and particle characterisation
The dynamics of carboxyl-modified polystyrene colloidal particles of varying size and zeta potential were investigated in a microfluidic junction device where merging electrolyte streams generated a steady-state salt concentration gradient. The device featured a long microchannel downstream of the…
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Journal Article
Hydrodynamics of laminar jet apparatuses for gas–liquid mass transfer experiments
Laminar jet apparatuses (LJAs) are employed to study gas–liquid mass transfer and thereby provide insights into the design of technical separation and reaction equipment. The hydrodynamics of the laminar jet determines the operating window of such apparatuses and must therefore be understood for…
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Journal Article
Transonic deep stall of a free-to-pitch rigid wing
This work presents a combined numerical and experimental investigation of a rigid wing free to pitch in a transonic flow at Mach 0.8. The wing exhibits small-amplitude oscillations around an equilibrium point in deep stall, where a large separation region develops on the suction side…
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Journal Article
Numerical analysis of offshore wind-farm-induced drag effects on coastal upwelling dynamics
Wind farms extract momentum from the atmospheric flow, generating wind-speed deficits both within the plant, and extending downstream. When located offshore, these deficits modulate air–sea coupling, potentially impacting coastal upwelling in sensitive regions. We investigate impacts of wind farms…
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Journal Article
Measurement of dynamic permeability in grazing flows for porous trailing edges
Porous trailing edges attenuate hydrodynamic pressure fluctuations that scatter as trailing-edge noise, with their effectiveness governed by their material parameters. Conventional measurements of permeability rely on steady-flow rigs, which cannot capture the dynamic response of this parameter…
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Journal Article
Turbulent flow past idealised arrays of photovoltaic panels: an experimental study
We experimentally investigated the turbulent flow in a water channel developing past a two-dimensional array of photovoltaic panels, with varying incidence angle and spacing. Particle image velocimetry revealed two distinct regimes, depending on the incidence angle, while the dependence on…
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Journal Article
Experimental study on haemodynamics downstream of a venous needle in haemodialysis
Needling of arteriovenous fistulas is a critical aspect of vascular access in haemodialysis, where a particular concern is the venous return needle strongly perturbing local haemodynamics. To isolate and characterise these effects, controlled experiments are performed in an idealised geometry…
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Journal Article
Spatial development of multi-orifice synthetic jets
This study presents the first systematic experimental investigation of the streamwise evolution of multi-orifice synthetic jets (MOSJs) driven by a single actuator. A centred hexagonal arrangement of seven circular orifices is examined using particle image velocimetry. Four cases are studied in…