Antti Hellsten
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View article: Quantitative validation in indoor dispersion modeling: Comparing large-eddy simulation results with experimental measurements
Quantitative validation in indoor dispersion modeling: Comparing large-eddy simulation results with experimental measurements Open
Modeling indoor contaminant dispersion is crucial for exposure analysis in fields like occupant safety and infection prevention. Accurate predictions necessitate appropriate computational approaches because numerical solutions to turbulent…
View article: Ensembles in Urban Large Eddy Simulations with Changing Wind Direction
Ensembles in Urban Large Eddy Simulations with Changing Wind Direction Open
Differences between time-averaged and ensemble-averaged wind are studied for the case of changing wind direction. We consider a flow driven by a temporally turning pressure gradient in both an idealized case of a staggered cube array and a…
View article: Ensembles in Urban Large Eddy Simulations with Changing Wind Direction
Ensembles in Urban Large Eddy Simulations with Changing Wind Direction Open
Differences between time-averaged and ensemble-averaged wind are studied for the case of changing wind direction. We consider a flow driven by a temporally turning pressure gradient in both an idealized case of a staggered cube array and a…
View article: PLOTO: Improved IWW Resilience Using Predictive Modelling, Environmentally Sustainable and Emerging Digital Technologies and Tools
PLOTO: Improved IWW Resilience Using Predictive Modelling, Environmentally Sustainable and Emerging Digital Technologies and Tools Open
More than 37,000 km of waterways connect hundreds of cities and industrial regions in Europe. These inland waterways play an important role in the transport of goods. The EU-funded PLOTO project aims at studying the resilience of the infra…
View article: Impact of Forest Density on Atmospheric Boundary Layer Flow and Turbulence for Wind Energy Applications
Impact of Forest Density on Atmospheric Boundary Layer Flow and Turbulence for Wind Energy Applications Open
Nowadays, it is common to build a wind farm in forest area as wind-energy production is growing rapidly. However, surrounding forests change the local wind conditions drastically and thus there is a need to understand the interaction of lo…
View article: Correlated spatiotemporal downscaling of Euro‐<scp>CORDEX</scp> climatic data for infrastructure resilience assessment
Correlated spatiotemporal downscaling of Euro‐<span>CORDEX</span> climatic data for infrastructure resilience assessment Open
A methodology is presented for downscaling the Euro‐CORDEX climatic projections in order to derive spatially and temporally correlated weather fields that can be used for risk and resilience assessment of large‐scale asset portfolios or in…
View article: A baseline approach for downscaling the Euro-CORDEX data for wind risk assessment of the Metsovo village in Greece
A baseline approach for downscaling the Euro-CORDEX data for wind risk assessment of the Metsovo village in Greece Open
A methodology is presented for downscaling the wind projections of Euro-CORDEX in order to derive temporally and spatially correlated region-wide wind fields that can be used for assessing the wind risk for cultural heritage sites. The coa…
View article: D3.3 Dynamical downscaling of climate & atmospheric impacts
D3.3 Dynamical downscaling of climate & atmospheric impacts Open
This deliverable D3.3 “Dynamical downscaling of climate & atmospheric impacts” provides a description of high resolution modeling approach to downscale both meteorological and wind information for the four HYPERION pilot sites. The downsca…
View article: Combining Phi6 as a surrogate virus and computational large‐eddy simulations to study airborne transmission of SARS‐CoV‐2 in a restaurant
Combining Phi6 as a surrogate virus and computational large‐eddy simulations to study airborne transmission of SARS‐CoV‐2 in a restaurant Open
COVID-19 has highlighted the need for indoor risk-reduction strategies. Our aim is to provide information about the virus dispersion and attempts to reduce the infection risk. Indoor transmission was studied simulating a dining situation i…
View article: Resolving micro to mesoscale interactions between urban surface and a sea-breeze circulation using high resolution large-eddy simulations
Resolving micro to mesoscale interactions between urban surface and a sea-breeze circulation using high resolution large-eddy simulations Open
<p>After a century of rapid urbanization, the majority of the world&#8217;s population is now living within urban areas. Despite this, micro and mesoscale meteorological dynamics and processes within the urban boundary layer are …
View article: Numerical Investigation on the Effects of Forest Heterogeneity on Wind-Turbine Wake
Numerical Investigation on the Effects of Forest Heterogeneity on Wind-Turbine Wake Open
This work aims at investigating the effects of forest heterogeneity on a wind-turbine wake under a neutrally stratified condition. Three types of forests, homogeneous (idealized), a real forest having natural heterogeneity, and an idealize…
View article: Evaluating modelled winds over an urban area using ground‐based Doppler lidar observations
Evaluating modelled winds over an urban area using ground‐based Doppler lidar observations Open
Wind information in urban areas is essential for many applications related to air pollution, urban climate and planning, safety of drone‐related operations, and assessment of urban wind energy potential. These applications require accurate…
View article: High-resolution large-eddy simulation of indoor turbulence and its effect on airborne transmission of respiratory pathogens—Model validation and infection probability analysis
High-resolution large-eddy simulation of indoor turbulence and its effect on airborne transmission of respiratory pathogens—Model validation and infection probability analysis Open
High-resolution large-eddy simulation (LES) is exploited to study indoor air turbulence and its effect on the dispersion of respiratory virus-laden aerosols and subsequent transmission risks. The LES modeling is carried out with unpreceden…
View article: A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0
A nested multi-scale system implemented in the large-eddy simulation model PALM model system 6.0 Open
Large-eddy simulation (LES) provides a physically sound approach to study complex turbulent processes within the atmospheric boundary layer including urban boundary layer flows. However, such flow problems often involve a large separation …
View article: Sensitivity of spatial aerosol particle distributions to the boundary conditions in the PALM model system 6.0
Sensitivity of spatial aerosol particle distributions to the boundary conditions in the PALM model system 6.0 Open
High-resolution modelling is needed to understand urban air quality and pollutant dispersion in detail. Recently, the PALM model system 6.0, which is based on large-eddy simulation (LES), was extended with the detailed Sectional Aerosol mo…
View article: review comments
review comments Open
The authors developed an LES-LES nested multi-scale system in the PALM model.A key point is to keep unsteady turbulent behaviors in nesting LES-LES models.As far as I know, they developed the two-way coupling scheme in obstacle-resolving L…
View article: A Nested Multi-Scale System Implemented in the Large-EddySimulation Model PALM model system 6.0
A Nested Multi-Scale System Implemented in the Large-EddySimulation Model PALM model system 6.0 Open
Large-eddy simulation provides a physically sound approach to study complex turbulent processes within the atmospheric boundary layer including urban boundary layer flows. However, such flow problems often involve a large separation of tur…
View article: Supplementary material to "Sensitivity of spatial aerosol particle distributions to the boundaryconditions in the PALM model system 6.0"
Supplementary material to "Sensitivity of spatial aerosol particle distributions to the boundaryconditions in the PALM model system 6.0" Open
Table S1.Instrumentation.Abbreviations: PSD = aerosol particle size distribution, BC = black carbon, PM2.5 = particulate matter with aerodynamic diameter < 2.5 µm, LDSA = lung-deposited surface area.
View article: Sensitivity of spatial aerosol particle distributions to the boundaryconditions in the PALM model system 6.0
Sensitivity of spatial aerosol particle distributions to the boundaryconditions in the PALM model system 6.0 Open
High-resolution modelling is needed to understand urban air quality and pollutant dispersion in detail. Recently, the PALM model system 6.0, which is based on the large-eddy simulation (LES), was extended with a detailed aerosol module SAL…
View article: Overview of the PALM model system 6.0
Overview of the PALM model system 6.0 Open
In this paper, we describe the PALM model system 6.0. PALM (formerly an abbreviation for Parallelized Large-eddy Simulation Model and now an independent name) is a Fortran-based code and has been applied for studying a variety of atmospher…
View article: Study of Realistic Urban Boundary Layer Turbulence with High-Resolution Large-Eddy Simulation
Study of Realistic Urban Boundary Layer Turbulence with High-Resolution Large-Eddy Simulation Open
This study examines the statistical predictability of local wind conditions in a real urban environment under realistic atmospheric boundary layer conditions by means of Large-Eddy Simulation (LES). The computational domain features a high…
View article: De-Icing Fluid Flow-Off from a Flat Plate in an Accelerating Airstream
De-Icing Fluid Flow-Off from a Flat Plate in an Accelerating Airstream Open
De-icing fluid flow-off from a flat plate subjected to an accelerating airflow was studied both experimentally and using computational fluid dynamics (CFD) simulations. The experimental tests were carried out in Aalto University's Low Spee…
View article: Overview of the PALM model system 6.0
Overview of the PALM model system 6.0 Open
In this paper we describe the PALM model system 6.0. PALM is a Fortran based code and has been applied for studying a variety of atmospheric and oceanic boundary layers for about 20 years. The model is optimized for use on massively parall…