wind modeling Articles
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ADMS 5 Buildings Validation Robins and Castro Wind Tunnel Experiments
1 Introduction Experiments were conducted in a simulated boundary layer representative of a suburban, or slightly rougher, environment in neutral stability conditions at a model scale of 1/300 of full scale. Concentrations were measured close to a cube-shaped building for emissions above the centre of the building roof. Release heights varying from one to two-and-a-half times the building height ...
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Progresses in wind analysis and modelling
Renewable energy sources such as wind energy are copiously available without any limitation. Many studies have been done on wind and its effects due to its importance in human life. In this research, an attempt is preformed for describing the wide range of wind impacts. This paper has presented several fields of studies in related to wind modelling and frequency analysis. Some possible areas of ...
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Comparison of two different operational models for complex terrain in neutral flow
The estimation of pollutant concentration from sources in complex terrain is something very difficult to achieve in an operational situation. In this paper, we evaluate two different approaches of wind-field modelling. The first is a fully used, mass consistent, model (MINERVE) from Aria Technologies, based on the interpolation of wind data under the constraint of minimising flux divergence. The ...
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On the numerical asymmetry in calculating Coriolis terms through the splitting method in a mesoscale model
The asymmetry in calculating the Coriolis terms by Marchuk's splitting method is discussed. It was found that although some asymmetry is required for linear stability, this asymmetry should be kept to a minimum. Otherwise, for instance, if the diffusion terms are calculated in between the Coriolis terms in the u and v equations of motion, one gets cross-isobaric low-level winds, which are ...
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A model for simulating atmospheric dispersion in low-wind conditions
A practical model for low-wind conditions was derived by integration of an instantaneous three-dimensional Gaussian puff equation, in which wind speed was assumed to be zero and standard deviations of a smoke (σy and σz) were expressed as a linear function of the dispersion time. When the plume spreads σy and σz were assumed to be linear functions of dispersion time, the ...
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Wind modelling based on wind input data conditions using Weibull distribution
Weibull distribution can be used to model the wind speed distribution at a particular site and hence, it can help in wind resource assessment (WRA) of a site. By calculating the shape (k) and scale (c) parameters for Weibull distribution, the wind speed frequency curve for a site can be made. Once this wind speed distribution for site is determined, it can be convolved with the power curve for a ...
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Prediction of meteorological variables using artificial neural networks
In the present study, artificial neural network (ANN) models are developed to predict seven meteorological parameters such as maximum temperature, minimum temperature, relative humidity, wind speed, sunshine hours, dew point and evaporation individually. To predict each of the meteorological parameters, recurrent MISO-ANN network is used. Totally seven ANN models are developed and the development ...
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Green Networks Integrated Urban Infrastructure - Case Study
AECOM and Collective Architecture were commissioned to undertake a series of feasibility studies using best practice examples in urban infrastructure, sustainable drainage and inclusive urban planning for six future candidate sites across Local Authority areas in Scotland. As part of the process, various technical aspects of the sites were investigated to inform the decision-making process and ...
By Innovyze
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Estimates of lateral dispersion parameters in low wind speed conditions
Wind speed time series recorded during stable low wind speed conditions are typically non–stationary, with large horizontal oscillations, commonly known as meandering. In this paper, two wavelet–based methods are proposed to obtain lateral dispersion coefficients from such time series. These methods, associated with a specific wind model, have been tested by using wind velocities recorded, with ...
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Numerical simulations of the wind flow and ozone formation during the Heilbronn ozone experiment
The Heilbronn ozone experiment was aimed at investigating the impact of short-term local-scale interventions on peak ozone levels during summer smog periods. The measures taken were estimated to lead to considerable reductions of road traffic emissions, but to only smaller reductions of industrial emissions. Model simulations with the European Zooming Model (EZM) were performed for assessing the ...
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Pollution control by reduction of drag on cars and buses through platooning
Platooning is synchronised movement of two or more vehicles, as a unit, travelling at the same speed with relatively small inter-vehicle spacing. It is generally done in order to increase the highway capacity (vehicles/lane/hour). It was recognised early on that close follow up would likely decrease the average vehicle drag. The authors also expected minimisation of drag on cars and buses moving ...
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Verification of Wind-Driven Volatilization Models
Abstract Mass-transfer processes of paramount importance, such as reaeration and volatilization, occur at the air–water interface. Particularly, volatilization is intensively studied because it can be a relevant removal process for toxic contaminants from flowing and standing surface waters. The paper provides a comparison among predictive equations available from literature for standing waters ...
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Validation of a mass consistent flow model as part of a decision support system
In the context of real time (online) decision support systems for nuclear installations, atmospheric dispersion and deposition has to be calculated for a mesoscale area. Typically, the wind field in this area is influenced by topography. Therefore, simple Gaussian type modelling is not appropriate. Initiated and funded by the Bundesamt fur Strahlenschutz, simple (diagnostic mass consistent) flow ...
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Design of simulator for modelling of wind turbine and transfer of maximum power using buck-boost converter
A small wind turbine simulator based on a separately excited DC motor-permanent magnet synchronous generator (PMSG) set has been proposed to evaluate the performance of the small wind turbine model. A DC shunt motor is used to produce varying aerodynamic power by varying field current with the help of an IGBT switch. The simulator is an equivalent gearless wind turbine model that fluctuate ...
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Evaluation of a 3-D flow and pollutant dispersion modelling system to estimate climatological groundlevel concentrations in complex coastal sites
A three-dimensional modelling system, made by a mass-consistent wind field model and by a Lagrangian particle model, has been applied to a Mediterranean complex coastal site to describe the atmospheric dispersion of pollutants emitted by a thermal power plant. Different short-term episodes have been simulated to cover the seasonal climate variability. Model results have been compared with local ...
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Comparative modelling of a passive release from an L-shaped building using one, two and three-dimensional dispersion models
A comparative study has been made for the modelling of a passive release from an L-shaped building, in the presence of wind, using dispersion models of various complexities. Selected for the comparison were the one- and two-dimensional shallow layer models DISPLAY-1 and DISPLAY-2 and the full three-dimensional model ADREA-HF, all being part of the Dense Gas Dispersion Code Package, jointly ...
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Comparisons of dispersion calculations between TA Luft and a method based on a more complex model combination (FITNAH/LPDM)
Dispersion calculations for regulatory purposes in Germany have been based on a Gaussian-type model for more than 20 years. Within this procedure nearly 88 000 hourly consecutive meteorological situations are evaluated statistically and put into 1944 classes. For each of these classes surface concentrations are calculated and combined to a one-year mean surface concentration field. Another ...
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Modelling concentration fluctuations for operational purposes
We investigated the two first moments of the concentration distribution from a point source release thanks to wind tunnel measurements. The results were analysed with the statistical model from Yee et al. (1994). This model requires two parameters related to the larger scale velocity fluctuations and to the concentration variability due to smaller scale fluctuations respectively. A robust ...
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Evaluation of CFD model predictions of local dispersion from an area source on a complex industrial site
The CFD model Fluidyn-Panache was configured to model atmospheric transport from an area source. Modelled flow and turbulence were evaluated by comparison with on-site meteorological measurements, whilst atmospheric dispersion was compared with wind tunnel measurements. The results showed that higher rates of vertical and lateral dispersion were modelled than were determined in the wind tunnel, ...
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Statistical analysis of prognostic mesoscale flow model results in the frame of APSIS
Taking into account available observations, results of several mesoscale flow models applied to definite scenarios in the framework of the Athenian Photosmog Simulation Intercomparison Study (APSIS) are subjected to a statistical analysis as an attempt at model evaluation. The procedure is applied to the wind speed, the wind direction and the air temperature. For a comprehensive presentation, ...
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