flow modeling Articles

  • Requirements for transport network flow models used in reliability analysis

    The network reliability of transport systems has been intensively studied in the last two decades. When we discuss network reliability models, the following four categories of topics can be identified: routing and scheduling under uncertain conditions; flow models for degraded and congested networks; evaluation and measurement of reliability; network design and management. Of these, transport ...


    By Inderscience Publishers

  • The influence of ejector component efficiencies on performance of Ejector Expander Refrigeration Cycle and exergy analysis

    In order to identify the amounts and locations of irreversibility within the components of the cycle, exergy analysis is employed. A two-phase constant area ejector flow model was used. As the ejector component efficiencies increase, coefficient of performance and exergy efficiency increase. As a result, when the efficiencies of motive nozzle and diffuser are 100%, the efficiency of ejector ...


    By Inderscience Publishers

  • Compositional fluid tracking: an optimised approach to subsea fluid sampling

    The complex challenges and cost of intervention in acquiring representative subsea fluid sampling has necessitated an optimised novel approach to compositional fluid tracking to improve estimation of the local fluid properties for facility design optimisation and operations of subsea production systems. This enables computation of the local thermodynamic and hydrodynamic equilibrium in a ...


    By Inderscience Publishers

  • Entropy generation for unsteady natural convection and radiation within a tilted saturated porous channel

    The problem of entropy generation for unsteady natural convection and radiation in a tilted open-ended channel, submitted to uniform hot walls temperature and filled with an isotropic fluid saturated porous medium is outlined. The present study is carried out using the Darcy flow model. The local thermal equilibrium assumption is assumed. Viscous dissipation effects are taken into account. The ...


    By Inderscience Publishers

  • Transient stability and power flow model of the unified power flow controller for various control strategies

    This paper describes and validates transient stability and power flow model of a Unified Power Flow Controller (UPFC), and presents a detailed comparison of different controls strategies, proposing novel, efficient, and simple controls for this controller. The proposed model accurately represents the behaviour of the controller in quasi-steady state operating conditions, and hence is adequate for ...


    By Inderscience Publishers

  • A CFD study of the effect of venturi geometry on high pressure wet gas metering

    Venturi meter is increasingly being preferred as wet gas flow meter because of its simple construction and ease of operation. It has been found that the performance of venturi in single phase gas is very different from that of water. In this work, with a view to optimise the design, the effects of diameter, diameter ratio and convergent angle on the performance of a venturi meter for wet gas ...


    By Inderscience Publishers

  • Vent Flows in Fire Compartments with Large Openings

    The Kawagoe vent flow model has been widely used to study fully developed compartment fires. It is well known that the Kawagoe model is only adequate for compartments with relatively small openings because it overestimates the vent flow rates for compartments with large openings. For a compartment with a very wide opening occupying a large fraction of one wall, experimental observations show that ...


    By SAGE Publications Ltd

  • Considering line status in the dispatch process to minimise transmission congestion cost and maximise system usage

    In competitive electricity markets, energy locational marginal prices (LMPs) are commonly used to allocate energy payments and transmission congestion charges and credits. In these markets, energy prices and transmission pricing are highly affected by transmission constraints, where a congested transmission is accompanied by congestion costs, lower system utilisation, and higher energy prices due ...


    By Inderscience Publishers

  • Exergy analysis of Airlift Systems: experimental approach

    Airlift Systems (ALS) are widely used in various industrial applications. As the main part of the flow through ALS's upriser pipe, is formed by gas-liquid flow, the analysis of such systems will be accompanied by problems of two-phase flow modelling. Several effective variables are involved in ALS; thereupon comprehensive method is needed to consider these parameters. Exergy analysis can be ...


    By Inderscience Publishers

  • Multi-objective optimisation of cost–benefit of urban flood management using a 1D2D coupled model

    This paper presents a multi-objective optimisation (MOO) tool for urban drainage management that is based on a 1D2D coupled model of SWMM5 (1D sub-surface flow model) and BreZo (2D surface flow model). This coupled model is linked with NSGA-II, which is an Evolutionary Algorithm-based optimiser. Previously the combination of a surface/sub-surface flow model and evolutionary optimisation has been ...


    By IWA Publishing

  • Anatomy of personal information processing: application to the EU privacy directive

    The term 'processing' (in relation to personal data) and its derivatives occur 213 times in the EU Privacy Directive. Yet the directive defines it in imprecise language. This paper investigates the notion of Personal Information (PI) processing in terms of a flow model with four phases and 17 generic acts on PI. This provides fine-grained sub-processes of PI processing and the opportunity to ...


    By Inderscience Publishers

  • Modelling of unsteady cavitating flow

    A 2D numerical model is proposed in this paper to simulate unsteady cavitating flows around hydrofoil NACA66mod. The objective of this study is to define a numerical procedure to model the unsteady cavitating flow. The Reynolds–averaged Navier–Stokes equations are solved for the liquid and vapour mixture, which is considered as a single fluid with variable density which is expressed as function ...


    By Inderscience Publishers

  • A simple explicit model approximating the relationship between speed and density of vehicular traffic on urban roads

    With the increase in simulation of urban environments for the purpose of planning, modelling vehicular traffic has become important. Since empirical evidence on traffic flow is relatively sparse, models are being increasingly used for planning urban roads and environments. In this paper, a simple, explicit model is proposed to approximate the speed versus density of vehicular traffic flow. The ...


    By Inderscience Publishers

  • CFD modelling of electrohydrodynamic gas flow in an electrostatic precipitator

    Modelling of the flow velocity fields for electrohydrodynamic flow in a wire-to-plate type electrostatic precipitator was achieved. From calculations for the flow employing different flow models, the Chen-Kim k − ε turbulent model appeared to be the most appropriate choice to obtain a quantitative image of the resulting mean flow field and downstream wake flow of the rear wire, although this was ...


    By Inderscience Publishers

  • Wresting informational privacy from free speech

    This paper deals with the conflict between privacy rights and freedom of speech. Courts have upheld freedom of speech to the detriment of the privacy interest. Even when the information is false, courts have been reluctant to allow restrictions on the collection and dissemination of personal information. To establish a stronger case for privacy, we concentrate on a special type of privacy: ...


    By Inderscience Publishers

  • On the influence of sea-surface temperature on mesoscale flows: an example from the city of Athens

    The differences resulting in mesoscale flow estimations when using constant or varying (in time and space) sea-surface temperature information have been investigated, with the aid of appropriate air-flow simulations. Results suggest interesting interactions of land and sea surfaces with the atmosphere, which are expected to influence atmospheric flow modelling and air quality management in ...


    By Inderscience Publishers

  • 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 ...


    By Inderscience Publishers

  • A model and a simulator for disaster recovery

    The level of economic and social cost arising from large scale disasters has become apparent in recent years. One of the conclusions that can be drawn from recent experiences is that both corporations and regulators have difficulty in predicting both the post disaster scenario, and the results of management actions in these scenarios. This paper discusses an approach that could lead to ...


    By Inderscience Publishers

  • Resilience-based failure mode effects and criticality analysis for regional water supply system

    An alternative risk assessment method, known as failure mode effects and criticality analysis (FMECA), is demonstrated on the regional water supply systems (RWSS) in Tucson, AZ, USA that combines delivery of potable and reclaimed water and conveyance of wastewater to a developing area within the Tucson RWSS. The goal of FMECA is to examine the volumetric severity of a component failure on the ...


    By IWA Publishing

  • Using MINEDWto simulate pore pressure as input for FLAC3Dand 3DEC

    It has become common practice to create a three-dimensional (3-D) geomechanical model for the analysis of rock stability. One of the key inputs for a geomechanical model is the 3-D pore-pressure distribution. For complicated geologic settings under excavation, such as open pit walls and underground mine workings, pore pressures generally do not follow hydrostatic distributions with depth; ...


    By Itasca International, Inc

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