numerical modeling Articles

  • Danfoss drives keep Espoo water flowing

    Espoo is Finland’s second largest city, with over 200,000 inhabitants, and relies largely on Danfoss drives for its water supply. Espoo Water has 140 Danfoss drives, including VLT®5000, VLT®6000 and VLT®8000 AQUA models, located in three potable water plants, one waste-water plant and numerous booster ...

  • Modelling and measurements of the atmospheric boundary layer in Sofia, Bulgaria

    The evaluation of mesoscale model simulations against experimental data on the vertical profiles of mean meteorological parameters and surface turbulent momentum and heat fluxes for Sofia, Bulgaria, is presented. The simulation of the vertical profiles is currently a weak point in mesoscale modelling, and needs investigation in view of the numerous practical applications.Keywords: Bulgaria, ...


    By Inderscience Publishers

  • A risk management framework and model for pension investment funds

    Risk management in finance is an increasingly important area, which has been highlighted in the midst of the global credit crisis. In this paper, we propose a new risk management model for pension investment funds: a risk management framework and risk measure based on modelling the pension fund value as an option. We review risk management, discussing risk management frameworks and risk ...


    By Inderscience Publishers

  • Development of an integrated system for air pollutant dispersion modelling

    A complex expert system for air pollutant dispersion modeling (ScalEx) is currently being developed at Faculty of Technology and Metallurgy in Belgrade. The project goal is to develop a powerful software system as an engineering toolbox for modelling air pollutant dispersion under various conditions and terrain configurations. ScalEx is planned to be an integrated software system of the new ...


    By Inderscience Publishers

  • A comprehensive review of conduction-controlled rewetting: theoretical models and analyses

    This review deals with conduction-controlled rewetting analysis for water-cooled nuclear reactors following a hypothetical Loss-of-Coolant Accident (LOCA). The first part of the survey deals with analytical solutions for various rewetting models. This contains the solution for one- and two-dimensional models, rewetting models with and without precursory cooling, rewetting models for two- and ...


    By Inderscience Publishers

  • Analyzing the turbulent flow on steep open channels

    In channels with steep slopes, the flow is supercritical and the formation of roll waves is expected. In order to evaluate the flow behaviors in steep open channels, the Azad dam spillway is simulated numerically and its flow characteristics are compared with the physical model tests. In this study, the hydraulic variables including hydraulic depth and water surface profile are studied along ...


    By IWA Publishing

  • Numerical modelling of gas dispersion from road tunnels in urban environments: comparison with field experiment data

    Numerical computations and field experiments of the dispersion of a tracer gas from a road tunnel in Paris are compared. The Reynolds-averaged Navier-Stokes equations, combined with the k-ε turbulence model of Chen and Kim, are solved using the finite-volume code PHOENICS. Results are shown to be sensitive to the turbulence modelling and to the parameterisation of turbulence and drag forces ...


    By Inderscience Publishers

  • Modelling of air pollution from road traffic

    This paper presents the basic principles of the method of calculating air pollution from road traffic in an urban built-up area. The algorithm of the method is based on the numerical integration of stationary two-dimensional partial differential equations of turbulent diffusion, with boundary conditions for the street canyons. The method consists of two modules: KALIB and STREETS, which calculate ...


    By Inderscience Publishers

  • A numerical model of an Active Magnetic Regenerator for refrigeration at room temperature

    In this paper, a numerical model of an Active Magnetic Regenerator (AMR) for refrigeration at room temperature has been evaluated. The model is based on the equation of state of a homogeneous ferromagnetic with reference to the gadolinium used as magnetocaloric substance. In this way the curves of the magnetisation and of the specific heat at constant magnetic field and of the adiabatic ...


    By Inderscience Publishers

  • Dispersion of a passive pollutant in the vicinity of a U-shaped building

    The three-dimensional microscale numerical model MIMO was applied to calculate the dispersion of a passive pollutant in the vicinity of a U-shaped building. Three different locations of a non-buoyant source and six different wind directions were examined. The calculated concentrations were compared with concentrations measured in a boundary layer wind tunnel. The comparison shows a very good ...


    By Inderscience Publishers

  • Comparison between analytical models to simulate pollutant dispersion in the atmosphere

    We present a numerical and statistical comparison between ADMM and GILTT approaches to simulate pollutant dispersion in the Planetary Boundary Layer (PBL). The numerical and statistical comparison of the ADMM and GILTT results confirms the equivalence of these methods. However, the ADMM approach is more efficient under computational point of view regarding the issue of computational time and, ...


    By Inderscience Publishers

  • A new methodology for the optimal design of series of pipes in sewer systems

    The sewer network design problem consists of determining both the layout and the hydraulic design of the system. This paper aims to find an optimal hydraulic design for a specific layout consisting of a series of pipes. An optimal hydraulic design of a series of pipes is that which satisfies all the hydraulic, commercial, and construction constraints, while minimizing the construction costs. ...


    By IWA Publishing

  • Thermodynamic modelling and performance of variable-temperature heat reservoir absorption refrigeration cycle

    An irreversible variable-temperature heat reservoir four-temperature-level absorption refrigeration cycle model is established in this paper. The considered losses include heat resistances between heat reservoirs and working fluid, internal irreversibilities due to internal dissipation of the working fluid, and the heat leakages between the heat reservoirs and the surroundings. The general ...


    By Inderscience Publishers

  • A study of heat transfer effects on air pollution dispersion in street canyons by numerical simulations

    This study investigated thermal effects on the flow and dispersion of pollutant in urban street canyons. A heating module was introduced into the micro scale model MIMO for describing the thermal exchange between the air in the street and the buildings. Furthermore, the influence of wall temperatures and building shading on the in-street flow and its vertical transport is discussed. Results from ...


    By Inderscience Publishers

  • Dry deposition modelling in a Lagrangian dispersion model

    Revisions to the dry deposition scheme in the Lagrangian dispersion model, NAME, are described. Improvements are made for situations where material is not well mixed within the boundary layer and for sedimenting heavy particles. The revised scheme overcomes problems of computational noise, common in Lagrangian dispersion models, with a manageable or no increase to the computational cost. The ...


    By Inderscience Publishers

  • The use of super-efficiency analysis for strategy ranking

    The evaluation of strategic alternatives is particularly a difficult task. This difficulty is due to the complexities inherent in the evaluation process and the lack of structured information. Various analytical and normative models have helped decision makers in strategy selection; however, these models suffer from subjective judgements. This paper proposes an innovative method for ranking ...


    By Inderscience Publishers

  • Incorporating different endogenous learning formulations in MERGE

    This paper presents the implementation of endogenous technological change, following either a one-factor or a two-factor learning curve, in the MERGE model. We have indeed developed a new version of this model, called MERGE-ETL, to analyse the dynamics of endogenous technological learning (ETL) in the energy system. This paper describes first the basic formulation of MERGE-ETL, then the solving ...


    By Inderscience Publishers

  • A neural-network-based variance decomposition sensitivity analysis

    This paper describes the implementation of an artificial neural network for obtaining the numerous model output calculations within a variance decomposition scheme for performing the model sensitivity analysis with respect to both individual and grouped parameters. A case study concerning the identification of the input variables mostly contributing to model output uncertainty, with reference to ...


    By Inderscience Publishers

  • Validation of the Eulerian pollution transport model PolTran on the Kincaid data set

    The study represents the first performance of the model PolTran on the Kincaid data set. PolTran is a typical representative of the Eulerian models: two dimensional Eulerian advection scheme and numerical calculation of the vertical diffusion. The meteorological pre-processor uses the Kincaid measurements of wind and temperature at 10, 50 and 100 m and provides the dispersion model with wind and ...


    By Inderscience Publishers

  • Exergy transfer analysis of a pin fin in external flow

    Based on the non-equilibrium thermodynamic theory, a general exergy transfer model is developed to describe the exergy transfer characteristics of external convection by using Black Body Approach. This model is applied to the study of fin efficiency for exergy transfer, which is defined as the ratio of the actual exergy transfer rate to the ideal exergy transfer rate. Both the analytical ...


    By Inderscience Publishers

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you