numerical modeling Articles

  • Numerical modeling of geomembranes

    SoilVision Systems Ltd. is pleased to announce the addition of internal boundary conditions which can be used to represent geomembrane materials. The new feature was implemented in response to requests from customers and represents a significant improvement for the numerical modeling of a number of different scenarios involving geomembranes. More specifically, the geomembrane internal boundary ...


    By SoilVision Systems Ltd.

  • The problem of judgement in constructing numerical models for policy analysis

    In many different fields it is now commonplace for complex numerical models to be constructed with a view to illuminating public policy issues. The analysts who construct these models have to make many decisions on how to represent the issues numerically, and they sometimes seek expert advice in this task. In this paper we first justify our assertion that modelling problems of this nature involve ...


    By Inderscience Publishers

  • Numerical Modeling of a Thermal Conductivity Matric Suction Sensor

    Thermal conductivity matric suction sensors appear to be a promising device for the measurement of suction in soil. The technique indirectly measures matric suction by measuring the thermal conductivity of a ceramic block. This paper uses both a spherical and a cylindrical porous medium to simulate the heat flow in a thermal conductivity matric suction sensor. It is found that, although the ...


    By ASTM International

  • Two-dimensional numerical modeling of wood transport

    The transport of wood material in rivers has been the subject of various studies in recent years. Most research has focused on the ecological and geomorphologic role of wood, its recruitment processes and spatial distribution in streams. In this study, we focused on wood transport dynamics, and we have developed a numerical model to simulate wood transport coupled with a two-dimensional (2D) ...


    By IWA Publishing

  • On the formulation of environmental fugacity models and their numerical solutions

    Multimedia models based on chemical fugacity, solved numerically, play an important role in investigating and quantifying the environmental fate of chemicals such as persistent organic pollutants (POPs). These models have been utilised extensively in the study of the local and global distribution of chemicals in the environment. This paper describes potential sources of error that may arise ...


    By John Wiley & Sons, Ltd.

  • Numerical modelling: a tool for better constructed wetland design?

    There is a need for a simplified computer-based design tool for subsurface flow constructed wetlands (CWs) which is based on process-based numerical models. Parameters of existing design guidelines and rules have been derived from experiments under specific conditions. Therefore designing CWs using these parameters is limited to these conditions (i.e. temperature, wastewater composition, filter ...


    By IWA Publishing

  • Numerical model of urban aerodynamics and pollution dispersion

    For analysis of atmospheric processes in the urban environment, the microscale meteorological and dispersion model M2UE is suggested, which takes into account a complex character of aerodynamics in non-uniform urban relief. The three-dimensional version of the model includes a system of Reynolds equations, two-equation k-ε model of turbulence and the 'advection-diffusion' equation to simulate ...


    By Inderscience Publishers

  • Hurricane MK cyclone system for PM emission reduction on a 2.5MWth biomass boiler at Britton Timbers. (8 760m3/h at 328°C) - Case Study

    Foreword Advanced Cyclone Systems, S.A. (ACS) designed and supplied a Hurricane Cyclone System type MK for particulate matter reduction from the flue gas of a biomass boiler in Australia. The boiler was installed at Britton Timbers, a diversified company with interests in timber harvesting, sawmilling, international timber import and export, and distribution. From humble ...

  • Numerical prediction of damping in structures with frictional joints

    In many vehicle and space structures, friction in bolted joints is the primary source of energy dissipation during vibrations. Several simplified finite element models have proven their capacity to describe the energy dissipation owing to micro-slip in joints. However, these simplified models require extensive physical testing in order to extract model parameters. This paper proposes a ...


    By Inderscience Publishers

  • Numerical investigation of sodium droplet ignition in the atmospheric air

    The ignition behaviour of sodium droplets in the atmospheric air has been studied numerically with two available models of pre–ignition stage combustion. Surface reaction is very important in the pre–ignition stage, and the different reaction rate–controlling processes involved in this stage are explained using the shrinking core model. The droplet ignition behaviour is studied by considering the ...


    By Inderscience Publishers

  • Numerical simulations of street canyon ventilation and pollutant dispersion

    The relationship among air exchange rate (ACH), pollutant exchange rate (PCH) and friction factor ( f ) is proposed in this study to evaluate the performance of ventilation and pollution removal of hypothetical urban areas. Urban areas were simplified to arrays of idealised, repeated two-dimensional (2D) street canyons of different building-height-to-street-width (aspect) ratios (ARs) and ...


    By Inderscience Publishers

  • Numerical Simulations on Aerodynamics of Thermally Induced Plumes

    Since the physics of air entrainment is not yet clearly understood, most of the fire plume expressions reported in the literature were derived empirically. Experiments with different fire geometry, fuels, and ambient conditions would be difficult when trying to derive comprehensive plume temperature and velocity fields from existing theories. Computational fluid dynamics (CFD), a practical ...


    By SAGE Publications

  • Meteorological data from numerical weather prediction or observations for dispersion modelling

    Synoptic observations of wind speed, direction, cloud cover, precipitation and temperature are inputs to regulatory dispersion modelling. Numerical Weather Prediction (NWP) data generated by national meteorological services are easily formatted for dispersion models. Changing from observations to NWP data raises concerns amongst regulators and model users – how might impact assessments differ if ...


    By Inderscience Publishers

  • A method of evaluating the topographical effect on atmospheric dispersion using a numerical model

    A method of evaluating topographical effects on exhaust gas dispersion using a numerical model is proposed. The numerical model consists of a turbulence closure model and a Lagrangian particle dispersion model. The topographical effect was evaluated in terms of the ratios of maximum concentration and the distance of the point of maximum concentration from the source on the topography to the ...


    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

  • Numerical study of some high PM10 level episodes

    The study examines the ability of US EPA Models-3 system to reproduce air pollution episodes and to evaluate the role of different processes in the PM10 pattern formation. The case study focuses on three major PM10 episodes, that occurred over Germany in February and March of 2003. The emission input is prepared on the basis of the TNO inventory. The simulated PM10 concentrations are compared ...


    By Inderscience Publishers

  • Probabilistic analysis of open stope stability using numerical modelling

    A probabilistic approach is presented for the analysis of open stope stability. The approach considers the inherent variability and uncertainty which are typical of rock mass properties. In this study, a series of numerical analyses were performed using FLAC to study the stability of open stopes while taking into account the variability in the rock mass properties. The rock mass was divided into ...


    By Inderscience Publishers

  • Development and validation of a fully modular platform for numerical modelling of air pollution: POLAIR

    This paper describes a three-dimensional chemistry transport model, POLAIR, with a special focus on numerical aspects. POLAIR is a fully modular eulerian model. Several different chemical mechanisms are available, which can deal with photochemistry (Racm, Radm, etc.), continental impact (e.g. passive transport), mercury, aerosols, etc. POLAIR is designed to enable simulations from regional scales ...


    By Inderscience Publishers

  • Systematic approach to numerical simulation and modelling of shale gas reservoirs

    With the rapid development of unconventional resources in the USA and its contribution by diminishing energy dependency on foreign supplies, reservoir simulation technology is facing new challenges in providing key information to be utilised for long-term development decisions. Therefore, growth in shale gas reservoir development necessitated new approach to reservoir simulation. In this paper, ...


    By Inderscience Publishers

  • 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 ...


    By Inderscience Publishers

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