Alan Robins
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View article: Predicting internal boundary layer growth following a roughness change in thermally neutral and stable boundary layers
Predicting internal boundary layer growth following a roughness change in thermally neutral and stable boundary layers Open
This study uses the diffusion analogy (Miyake, Sci. Rep. , 5R-6, 1965, Univ. of Washington, Seattle, USA) to predict the full growth behaviour of internal boundary layers (IBLs) induced by a roughness change for neutrally – and especially …
View article: urbisphere - ASSURE: Bristol: Across-Scale processeS in URban Environments on our way to coupling dynamic cities and climate
urbisphere - ASSURE: Bristol: Across-Scale processeS in URban Environments on our way to coupling dynamic cities and climate Open
Worsening local and global environmental conditions from climate change affect most of the world’s urban population. To develop sustainable, resilient and healthy environments in the face of these challenge requires support from improved m…
View article: Wind Tunnel Modelling of Flow and Pollutant Dispersion in a Heterogeneous Urban Area
Wind Tunnel Modelling of Flow and Pollutant Dispersion in a Heterogeneous Urban Area Open
Understanding air flow and pollutant dispersion in heterogeneous urban environments is essential for improving urban climate models and air quality predictions. This study presents results from wind tunnel experiments on investigating disp…
View article: Observations of tall-building wakes using a scanning Doppler lidar
Observations of tall-building wakes using a scanning Doppler lidar Open
High-rise buildings, increasingly a feature of many large cities, impact local atmospheric flow conditions. Tall-building wakes affect air quality downstream due to turbulent mixing and require parameterisation in dispersion models. Previo…
View article: Wake Characteristics of Multiscale Buildings in a Turbulent Boundary Layer
Wake Characteristics of Multiscale Buildings in a Turbulent Boundary Layer Open
Urban forms characterised by multi-scale roughness can drastically modify the wind structure within cities affecting both pedestrian comfort and air quality at street level, however, for simplicity, most urban flow studies focus on cuboid …
View article: A Gaussian-plume based Monte Carlo method for calculating radiation dose in the near field of buildings
A Gaussian-plume based Monte Carlo method for calculating radiation dose in the near field of buildings Open
A Monte Carlo (MC) programme was written using the dose point kernel method to calculate doses in the roof zone of a building from nearby releases of radioactive gases. A Gaussian Plume Model (GPM) was parameterised to account for near-fie…
View article: Statistical properties of neutrally and stably stratified boundary layers in response to an abrupt change in surface roughness
Statistical properties of neutrally and stably stratified boundary layers in response to an abrupt change in surface roughness Open
We conducted experimental investigations on the effect of stable thermal conditions on rough-wall boundary layers, with a specific focus on their response to abrupt increases in surface roughness. For stably stratified boundary layers, a n…
View article: Comment on egusphere-2024-937
Comment on egusphere-2024-937 Open
Abstract. High-rise buildings, increasingly a feature of many large cities, impact local atmospheric flow conditions. Tall building wakes affect air quality downstream due to turbulent mixing and require parametrization in dispersion model…
View article: Observations of Tall-Building Wakes Using a Scanning Doppler Lidar
Observations of Tall-Building Wakes Using a Scanning Doppler Lidar Open
High-rise buildings, increasingly a feature of many large cities, impact local atmospheric flow conditions. Tall building wakes affect air quality downstream due to turbulent mixing and require parametrization in dispersion models. Previou…
View article: Experimental study of the turbulent characteristics in the wake of tall building clusters
Experimental study of the turbulent characteristics in the wake of tall building clusters Open
This manuscript mainly explores the characteristics of turbulence quantities in the wake of tall building clusters of different array size ( $N$ ) and building spacing ( $W_S$ ) arranged in an aligned and regular grid in the flow direction…
View article: Wake Characterization of Building Clusters Immersed in Deep Boundary Layers
Wake Characterization of Building Clusters Immersed in Deep Boundary Layers Open
Wind tunnel experiments were conducted to understand the effect of building array size ( N ), aspect ratio ( AR ), and the spacing between buildings ( $$W_S$$ ) on the mean structure and decay of their wakes. Arrays of size 3 $$\times …
View article: Wake Characterization of Building Clusters Immersed in Atmospheric Boundary Layers
Wake Characterization of Building Clusters Immersed in Atmospheric Boundary Layers Open
Wind tunnel experiments were conducted to understand the effect of building array size ( N ), aspect ratio ( AR ), and the spacing between building ( W S ) on the mean structure and decay of their wakes. Arrays of size 3×3, 4×4,and 5×5, AR…
View article: Neutrally- and stably-stratified boundary layers adjustments to a step change in surface roughness
Neutrally- and stably-stratified boundary layers adjustments to a step change in surface roughness Open
In this work, we study the development of the internal boundary layer (IBL) induced by a surface roughness discontinuity, where the downstream surface has a roughness length greater than that upstream. The work is carried out in the EnFlo …
View article: Group riding: Cyclists exposure to road vehicle emissions in urban environments
Group riding: Cyclists exposure to road vehicle emissions in urban environments Open
A series of wind tunnel experiments were conducted in the University of Surrey's Environmental Flow wind tunnel with a 1:50 scale of a typical London street canyon to assess the exposure of cyclists riding in a group to the emissions of po…
View article: Neutrally- and Stably-Stratified Boundary Layers Adjustments to a Step Change in Surface Roughness
Neutrally- and Stably-Stratified Boundary Layers Adjustments to a Step Change in Surface Roughness Open
In this work, we study the development of the internal boundary layer (IBL) induced by a surface roughness discontinuity, where the downstream surface has a roughness length greater than that upstream. The work is carried out in the EnFlo …
View article: High Resolution Modelling of Traffic Emissions Using the Large Eddy Simulation Code Fluidity
High Resolution Modelling of Traffic Emissions Using the Large Eddy Simulation Code Fluidity Open
The large eddy simulation (LES) code Fluidity was used to simulate the dispersion of NOx traffic emissions along a road in London. The traffic emissions were represented by moving volume sources, one for each vehicle, with time-varying emi…
View article: Drag Reduction of a Circular Cylinder Through the Use of an Architectured Lattice Material
Drag Reduction of a Circular Cylinder Through the Use of an Architectured Lattice Material Open
Materials with periodic architectures exhibit many beneficial characteristics such as high specific stiffness thanks to the material placement along the stress paths and the nano-scale strength amplification achieved through the use of hie…
View article: Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part II
Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part II Open
This dataset contains Part II of a series of wind-tunnel flow measurements in a 1:200 scale model of a part of the London Borough of Southwark. Part I of the dataset is also published on Zenodo. The data published here (Part II) accompanie…
View article: Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part II
Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part II Open
This dataset contains Part II of a series of wind-tunnel flow measurements in a 1:200 scale model of a part of the London Borough of Southwark. Part I of the dataset is also published on Zenodo. The data published here (Part II) accompanie…
View article: Variability of physical meteorology in urban areas at different scales: implications for air quality
Variability of physical meteorology in urban areas at different scales: implications for air quality Open
AQ in cities varies in time and space with the atmosphere's physical state. UBL seasonal–diurnal variations (Beijing, Paris) will impact AQ. Isolated and clusters of tall buildings affect flow and pollutant exchange (London, Beijing).
View article: Wake Characteristics of Tall Buildings in a Realistic Urban Canopy
Wake Characteristics of Tall Buildings in a Realistic Urban Canopy Open
The presence of tall buildings in cities affects momentum and scalar exchange within and above the urban canopy. As wake effects can be important over large distances, they are crucial for urban-flow modelling on and across different spatia…
View article: Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part I
Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part I Open
This dataset contains the first part of a series of wind-tunnel flow measurements in a 1:200 scale model of a part of the London Borough of Southwark. The data published here accompanies analyses in Hertwig et al. (2019): D. Hertwig, H.L. …
View article: Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part I
Dataset: Impact of tall buildings and building-height variability on flow within and above a complex urban canopy in London - Part I Open
This dataset contains the first part of a series of wind-tunnel flow measurements in a 1:200 scale model of a part of the London Borough of Southwark. The data published here accompanies analyses in Hertwig et al. (2019): D. Hertwig, H.L. …
View article: Natural ventilation in cities: the implications of fluid mechanics
Natural ventilation in cities: the implications of fluid mechanics Open
Research under the Managing Air for Green Inner Cities (MAGIC) project uses measurements and modelling to investigate the connections between external and internal conditions: the impact of urban airflow on the natural ventilation of a bui…
View article: Validation Study for an Atmospheric Dispersion Model, Using Effective Source Heights Determined from Wind Tunnel Experiments in Nuclear Safety Analysis
Validation Study for an Atmospheric Dispersion Model, Using Effective Source Heights Determined from Wind Tunnel Experiments in Nuclear Safety Analysis Open
For more than fifty years, atmospheric dispersion predictions based on the joint use of a Gaussian plume model and wind tunnel experiments have been applied in both Japan and the U.K. for the evaluation of public radiation exposure in nucl…