Callum Atkinson
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View article: Investigation of the effects of superhydrophobic surface treatment on the dynamics of the flow in the near wake of a sphere using spatial dynamic mode decomposition
Investigation of the effects of superhydrophobic surface treatment on the dynamics of the flow in the near wake of a sphere using spatial dynamic mode decomposition Open
Viscous drag results from the fluid at a surface having zero relative velocity, a phenomenon known as the no-slip condition. Superhydrophobic surfaces, when submerged in water, trap a layer of air in their surface texture, partially replac…
View article: Study of the Turbulent/Non-turbulent Interface of Zero-Pressure-Gradient Turbulent Boundary Layer Using the Uniform Momentum Zone Concept
Study of the Turbulent/Non-turbulent Interface of Zero-Pressure-Gradient Turbulent Boundary Layer Using the Uniform Momentum Zone Concept Open
This paper investigates the turbulent--non-turbulent interface (TNTI) in a zero-pressure-gradient turbulent boundary layer (ZPG-TBL) using a novel, threshold-free method based on the uniform momentum zone (UMZ) concept. Requiring only plan…
View article: Interplay of scales during the spatial evolution of energy-containing motions in wall-bounded turbulent flows
Interplay of scales during the spatial evolution of energy-containing motions in wall-bounded turbulent flows Open
This article extends the previous investigation of the spatial evolution of energy-containing motions in wall-bounded turbulent flows (Kannadasan et al. , J. Fluid Mech. , vol. 955, 2023, R1) by examining their scale-interactions through s…
View article: Energy transfer in the formation and evolution of energy-containing motions in turbulent boundary layers
Energy transfer in the formation and evolution of energy-containing motions in turbulent boundary layers Open
This paper examines using direct numerical simulation (DNS) the recovery of the energy-containing scales of motion (energy-containing motions) when these are removed at the inflow boundary condition of a flat plate zero-pressure gradient t…
View article: Investigating the use of 3-component-2-dimensional particle image velocimetry fields as inflow boundary condition for the direct numerical simulation of turbulent channel flow
Investigating the use of 3-component-2-dimensional particle image velocimetry fields as inflow boundary condition for the direct numerical simulation of turbulent channel flow Open
Direct numerical simulation (DNS) of turbulent wall-bounded flows requires long streamwise computational domains to establish the correct spatial evolution of large-scale structures with high fidelity. In contrast, experimental measurement…
View article: Direct numerical simulation of a thermal turbulent boundary layer: an analogy to simulate bushfires and a testbed for artificial intelligence remote sensing of bushfire propagation
Direct numerical simulation of a thermal turbulent boundary layer: an analogy to simulate bushfires and a testbed for artificial intelligence remote sensing of bushfire propagation Open
Direct numerical simulation of a turbulent thermal boundary layer (TTBL) can perform the role of an analogy to simulate bushfires that can serve as a testbed for artificial intelligence (AI) enhanced remote sensing of bushfire propagation.…
View article: Simultaneous investigation of flow and thermal fields inside a square duct with a built-in heated circular cylinder
Simultaneous investigation of flow and thermal fields inside a square duct with a built-in heated circular cylinder Open
Air-based cooling methods are widely used for heat exchange and thermal management, due to their potential for heat removal with minimal complexity and operating costs. However, the physical mechanisms involved in these processes are not y…
View article: Investigating the use of 3-component - 2-dimensional particle image velocimetry fields as inflow boundary condition for the direct numerical simulation of turbulent channel flow
Investigating the use of 3-component - 2-dimensional particle image velocimetry fields as inflow boundary condition for the direct numerical simulation of turbulent channel flow Open
Direct numerical simulation (DNS) of turbulent wall-bounded flows requires long streamwise computational domains to establish the correct spatial evolution of large-scale structures with high fidelity. In contrast, experimental measurement…
View article: Investigating the Linear Dynamics of the Near-Field of a Turbulent High-Speed Jet Using Dual-Particle Image Velocimetry (PIV) and Dynamic Mode Decomposition (DMD)
Investigating the Linear Dynamics of the Near-Field of a Turbulent High-Speed Jet Using Dual-Particle Image Velocimetry (PIV) and Dynamic Mode Decomposition (DMD) Open
The quest for the physical mechanisms underlying turbulent high-speed jet flows is underpinned by the extraction of spatio-temporal coherent structures from their flow fields. Experimental measurements to enable data decomposition need to …
View article: Characterisation of a self-similar turbulent boundary layer near separation measured using high-spatial-resolution two-component - two-dimensional particle image velocimetry
Characterisation of a self-similar turbulent boundary layer near separation measured using high-spatial-resolution two-component - two-dimensional particle image velocimetry Open
This paper report on the design of an experiment to establish an experimental self-similar adverse pressure gradient (APG) turbulent boundary layer (TBL) flow at the verge of separation in order to characterise its statistical structure an…
View article: Spectral analysis of the evolution of energy-containing eddies
Spectral analysis of the evolution of energy-containing eddies Open
Energy-containing eddies (energy-eddies) are the elementary structures of wall turbulence that carry most of the kinetic energy and momentum. Despite the consensus that energy-eddies can self-sustain at each relevant length scale, their pr…
View article: Intense large-scale motions in zero and adverse pressure gradient turbulent boundary layers
Intense large-scale motions in zero and adverse pressure gradient turbulent boundary layers Open
Proper orthogonal decomposition (POD) is used to study coherent structures in wall-bounded turbulent flows. The present study uses POD in turbulent boundary layers to determine the contributions of the intense large-scale motions (LSMs) to…
View article: High Spatial Resolution 2C-2D PIV Measurements Using A 47 MPx Sensor Of High Reynolds Number Turbulent Boundary Layer Flow
High Spatial Resolution 2C-2D PIV Measurements Using A 47 MPx Sensor Of High Reynolds Number Turbulent Boundary Layer Flow Open
In the past decade, advances in electronics technology have made larger imaging sensors available to the experimental fluid mechanics community. These advancements have enabled the measurement of 2-component 2-dimensional (2C-2D) velocity …
View article: novel method to accurately align the laser sheet for planar and stereoscopic PIV
novel method to accurately align the laser sheet for planar and stereoscopic PIV Open
Several techniques including two-dimensional (2D) and three-dimensional (3D) calibration are used for the calibration of two-component two-dimensional (2C-2D) particle image velocimetry (PIV) and three-component two-dimensional (3C-2D) ste…
View article: Investigation of Large Scale Motions in Zero and Adverse Pressure Gradient Turbulent Boundary Layers Using High-Spatial-Resolution PIV
Investigation of Large Scale Motions in Zero and Adverse Pressure Gradient Turbulent Boundary Layers Using High-Spatial-Resolution PIV Open
Particle image velocimetry (PIV) has been used to capture the high-spatial-resolution (HSR) two-component, two-dimensional (2C-2D) velocity fields of a zero-pressure-gradient (ZPG) turbulent boundary layer (TBL) and of an adverse-pressure-…
View article: PIV Measurements of the Wake Formation from a Rough Flat Plate
PIV Measurements of the Wake Formation from a Rough Flat Plate Open
Wake flows are prevalent in a wide range of engineering applications and their behaviour can significantly impact engineering design and performance. A considerable body of work exists on smooth body wake structures and flows over rough bo…
View article: Analysis of the Contribution of Large Scale Motions to the Skin Friction of a Zero-Pressure-Gradient Turbulent Boundary Layer Using the Renard-Deck Decomposition
Analysis of the Contribution of Large Scale Motions to the Skin Friction of a Zero-Pressure-Gradient Turbulent Boundary Layer Using the Renard-Deck Decomposition Open
Coherent flow structures in turbulent boundary layers have been an active field of research for many decades, as they might be the key to reveal the mechanics of turbulence production and transport in turbulent shear flows. Renard and Deck…
View article: Three-dimensional density measurements of a heated jet using laser-speckle tomographic background-oriented schlieren
Three-dimensional density measurements of a heated jet using laser-speckle tomographic background-oriented schlieren Open
Three-dimensional density field measurement techniques can be used to understand the complex heat transfer and mixing processes that occur in turbulent flows. Tomographic background-oriented schlieren (BOS) is an optical technique that can…
View article: On assuring the accurate alignment of laser sheets for planar and stereoscopic PIV
On assuring the accurate alignment of laser sheets for planar and stereoscopic PIV Open
Several calibration techniques have been proposed in the literature for the calibration of two-component two-dimensional (2C-2D) particle image velocimetry (PIV) and three-component two-dimensional (3C-2D) stereoscopic PIV (SPIV) systems. …
View article: On assuring the accurate alignment of laser sheets for planar and\n stereoscopic PIV
On assuring the accurate alignment of laser sheets for planar and\n stereoscopic PIV Open
Several calibration techniques have been proposed in the literature for the\ncalibration of two-component two-dimensional (2C-2D) particle image velocimetry\n(PIV) and three-component two-dimensional (3C-2D) stereoscopic PIV (SPIV)\nsystem…
View article: Investigation of Large Scale Motions in Zero and Adverse Pressure Gradient Turbulent Boundary Layers Using High-Spatial-Resolution PIV
Investigation of Large Scale Motions in Zero and Adverse Pressure Gradient Turbulent Boundary Layers Using High-Spatial-Resolution PIV Open
High-spatial-resolution (HSR) two-component, two-dimensional particle-image-velocimetry (2C-2D PIV) measurements of a zero-pressure-gradient (ZPG) turbulent boundary layer (TBL) and an adverse-pressure-gradient (APG)-TBL were taken in the …
View article: Effect of limited near-wall inlet data on the direct numerical simulation of turbulent channel flow
Effect of limited near-wall inlet data on the direct numerical simulation of turbulent channel flow Open
Direct numerical simulation (DNS) of turbulent flows require a large computational domain and a long simulation time to capture and evolve the large-scale structures and attain a statistically stationary state. In contrast, experimental me…