The Experts below are selected from a list of 177102 Experts worldwide ranked by ideXlab platform

Xi Jiang - One of the best experts on this subject based on the ideXlab platform.

  • a review of Physical Modelling and numerical simulation of long term geological storage of co2
    Applied Energy, 2011
    Co-Authors: Xi Jiang
    Abstract:

    Numerical simulations are essential to the understanding of the long-term geological storage of CO2. Physical Modelling of geological storage of CO2 has been based on Darcy's law, together with the equations of conservation of mass and energy. Modelling and simulations can be used to predict where CO2 is likely to flow, to interpret the volume and spatial distribution of CO2 under storage conditions, and to optimise injection operations. The state of the art of Physical Modelling and numerical simulation of CO2 dispersion is briefly reviewed in this paper, which calls for more accurate and more efficient Modelling approaches. A systematic evaluation of the numerical methods used and a comparison between the streamline based methods and the grid based methods would be valuable. Multi-scale Modelling may prove to be of great value in predicting the long-term geological storage of CO2, while highly accurate numerical methods such as high-order schemes may be employed in numerical simulations of CO2 dispersion for local transport calculations. (C) 2011 Elsevier Ltd. All rights reserved.

  • a review of Physical Modelling and numerical simulation of long term geological storage of co2
    Applied Energy, 2011
    Co-Authors: Xi Jiang
    Abstract:

    Numerical simulations are essential to the understanding of the long-term geological storage of CO2. Physical Modelling of geological storage of CO2 has been based on Darcy’s law, together with the equations of conservation of mass and energy. Modelling and simulations can be used to predict where CO2 is likely to flow, to interpret the volume and spatial distribution of CO2 under storage conditions, and to optimise injection operations. The state of the art of Physical Modelling and numerical simulation of CO2 dispersion is briefly reviewed in this paper, which calls for more accurate and more efficient Modelling approaches. A systematic evaluation of the numerical methods used and a comparison between the streamline based methods and the grid based methods would be valuable. Multi-scale Modelling may prove to be of great value in predicting the long-term geological storage of CO2, while highly accurate numerical methods such as high-order schemes may be employed in numerical simulations of CO2 dispersion for local transport calculations.

  • Physical Modelling and advanced simulations of gas liquid two phase jet flows in atomization and sprays
    Progress in Energy and Combustion Science, 2010
    Co-Authors: Xi Jiang, G A Siamas, K Jagus, T G Karayiannis
    Abstract:

    Abstract This review attempts to summarize the Physical models and advanced methods used in computational studies of gas–liquid two-phase jet flows encountered in atomization and spray processes. In traditional computational fluid dynamics (CFD) based on Reynolds-averaged Navier–Stokes (RANS) approach, Physical Modelling of atomization and sprays is an essential part of the two-phase flow computation. In more advanced CFD such as direct numerical simulation (DNS) and large-eddy simulation (LES), Physical Modelling of atomization and sprays is still inevitable. For multiphase flows, there is no model-free DNS since the interactions between different phases need to be modelled. DNS of multiphase flows based on the one-fluid formalism coupled with interface tracking algorithms seems to be a promising way forward, due to the advantageous lower costs compared with a multi-fluid approach. In LES of gas–liquid two-phase jet flows, subgrid-scale (SGS) models for complex multiphase flows are very immature. There is a lack of well-established SGS models to account for the interactions between the different phases. In this paper, Physical Modelling of atomization and sprays in the context of CFD is reviewed with Modelling assumptions and limitations discussed. In addition, numerical methods used in advanced CFD of atomization and sprays are discussed, including high-order numerical schemes. Other relevant issues of Modelling and simulation of atomization and sprays such as nozzle internal flow, dense spray, and multiscale Modelling are also briefly reviewed.

Claude Cadoz - One of the best experts on this subject based on the ideXlab platform.

  • Physical Modelling Concepts for a Collection of Multisensory Virtual Musical Instruments
    2015
    Co-Authors: James Leonard, Claude Cadoz
    Abstract:

    This paper discusses how haptic devices and Physical Modelling can be employed to design and simulate multisensory virtual musical instruments, providing the musician with joint audio, visual and haptic feedback. After briefly reviewing some of the main use-cases of haptics in Computer Music, we present GENESIS-RT, a software and hardware platform dedicated to the design and real-time haptic playing of virtual musical instruments using mass-interaction Physical Modelling. We discuss our approach and report on advancements in Modelling various instrument categories, including Physical models of percussion, plucked and bowed instruments. Finally, we comment on the constraints, challenges and new possibilities opened by Modelling haptic virtual instruments with our platform, and discuss common points and differences in regards to classical Digital Musical Instruments.

  • Self-Sustained Vibrating Structures Physical Modelling by Means of Mass-Interaction Networks
    2007
    Co-Authors: François Poyer, Claude Cadoz
    Abstract:

    GENESIS is a sound synthesis and musical creation environment based on the mass-interaction CORDIS-ANIMA Physical Modelling formalism. It has got the noteworthy property that it allows to work both on sound itself and on musical composition in a single coherent environment. In this paper we present the first results of a study that is carried out with GENESIS on a particular type of models: self-sustained oscillating structures. By trying to build Physical models of real instruments like bowed strings or woodwinds, our aim is to develop and analyse generic tools that can be used for the production of self-sustained oscillations on every mass-interaction network built with GENESIS. But, if the family of the self-sustained oscillating structures is very interesting to create rich timbres, it can also play a new and fundamental role at the level of the temporal macrostructure of the music (that of the gesture and the instrumental performance, as well as the composition). Indeed, it is possible, as we will propose in this paper, to use the relatively complex motion of a bowed macro- structure in a musical composition way, as a musical events generator.

  • Production of Immersive Musical Architecture by Physical Modelling of Self-Sustained Oscillating Structures
    2007
    Co-Authors: François Poyer, Claude Cadoz
    Abstract:

    This paper presents the first results of a study on Physical Modelling of self-sustained oscillating structures, that was carried out with the sound synthesis and musical creation environment GENESIS. This study aims at producing sounds with rich timbre and, at a compositional level, at building immersive complex musical architectures. Indeed, based on the mass-interaction CORDIS-ANIMA Physical Modelling formalism, GENESIS has got the noteworthy property that it allows to work both on sound itself and on musical composition in a single coherent environment. So generic tools to model self-sustained oscillating structures are developed and analysed in order to work on rich timbres and on the temporal macrostructure of the music, that is of the gesture and the instrumental performance, as well as the composition. In fact, we use the complex motion of a bowed macrostructure as a musical events generator which behaviour may simulate an expressive "instrumental performance" and lead to evocative and immersive musical architectures.

  • Physical Modelling as a Proposed Framework for the Conception the Design and the Implementation of Sound Transformations
    2007
    Co-Authors: Alexandros Kontogeorgakopoulos, Claude Cadoz
    Abstract:

    Since the early days of electronic and computer music, a variety of methods dedicated to the processing of musical signals have been proposed, designed and developed by musicians and sound engineers. Every underlying technique and technology that has been used for the realization of the audio processing systems offered different types of sound transformations and proposed new ways of control. The advent of signal processing by digital computers stimulated deeply the researchers in this domain for the conception of new audio effects. On the other hand, Modelling and digital simulation formalisms have been principally used for the merely imitation and emulation of older sound processing systems. The aim of this article is to propose an approach for the conception, the design and the implementation of digital audio effects based on Physical Modelling.

  • Sound Synthesis and Musical Composition by Physical Modelling of Self-Sustained Oscillating Structures
    2007
    Co-Authors: François Poyer, Claude Cadoz
    Abstract:

    In this paper, we present the first results of a study that is carried out with the sound synthesis and musical creation environment GENESIS on self-sustained oscillating structures models. Based on the mass-interaction CORDIS-ANIMA Physical Modelling formalism, GENESIS has got the noteworthy property that it allows to work both on sound itself and on musical composition in a single coherent environment. By taking as a starting point the analysis of real self-sustained instruments like bowed strings or woodwinds, our aim is to develop generic tools that enable to investigate a wide family of Physical models: the self-sustained oscillating structures. But, if this family is able to create rich timbres, it can also play a new and fundamental role at the level of the temporal macrostructure of the music (the gesture and the instrumental performance level, as well as the composition one). So we propose also in this paper to use the relatively complex motion of a bowed macrostructure as a musical events generator, in order to work with the musical composition possibilities of this type of models.

Graham Symonds - One of the best experts on this subject based on the ideXlab platform.

  • Shoreline response to multi-functional artificial surfing reefs: A numerical and Physical Modelling study
    Coastal Engineering, 2006
    Co-Authors: Roshanka Ranasinghe, Ian L Turner, Graham Symonds
    Abstract:

    The results of a series of 2DH numerical and 3D scaled Physical Modelling tests indicate that processes governing shoreline response to submerged structures, such as artificial surfing reefs, are different from those associated with emergent offshore breakwaters. Unlike the case of emergent offshore breakwaters, where shoreline accretion (salient development) is expected under all structural/environmental conditions, the principal mode of shoreline response to submerged structures can vary between erosive and accretive, depending on the offshore distance to the structure. The predominant wave incidence angle and structure crest level also have important implications on the magnitude of shoreline response, but not on the mode of shoreline response (i.e. erosion vs. accretion). Based on the results obtained here, a predictive empirical relationship is proposed as a preliminary engineering tool to assess shoreline response to submerged structures. Crown Copyright © 2006.

Fu-ping Gao - One of the best experts on this subject based on the ideXlab platform.

  • Physical Modelling of local scour at twin piles under combined waves and current
    Coastal Engineering, 2019
    Co-Authors: Fu-ping Gao
    Abstract:

    Abstract Under the actions of ocean waves and current, severe local scour can be induced around pile groups, significantly compromising the safety of marine structures. A series of flume tests were conducted for Physical Modelling the local scouring process around twin piles in the cohesionless soils under combined waves and currents, and compared with the pure current case. The effects of non-dimensional pile spacing (G/D) and flow skew angle (α) on the scour depth and time scale of scour around twin piles are intensively examined. The experimental observations indicate that the influence of pile spacing on the scour depth development is much more significant for the side-by-side (α = 90ο) arrangement than that for the tandem arrangement (α = 0°). With the increase of flow skew angle α, the maximum scour depth is remarkably enhanced within the examined range 0 ≤ G/D ≤ 3.0. When G/D = 3.0, the pile group effect on the time scale is generally negligible for pure current cases, whereas a prominent pile-group effect can still be observed for combined wave-current cases, especially for the side-by-side arrangement. A parameter of "equivalent pile diameter" is then introduced for evaluating the maximum scour depth at the twin piles with the previous formulas for the single pile. Based on the existing and present experimental data, the empirical formula of dimensionless equivalent pile diameter as the function of G/D and α is established to predict the maximum scour depth at the twin piles.

D. Z. Zhu - One of the best experts on this subject based on the ideXlab platform.

  • Physical Modelling of pool and weir fishways with rock weirs
    River Research and Applications, 2017
    Co-Authors: C. Kupferschmidt, D. Z. Zhu
    Abstract:

    The flow characteristics of pool and weir fishways with rock weirs were studied through Physical Modelling. Detailed flow measurements were obtained using an acoustic Doppler velocimeter to understand how weir geometry, discharge, and bed slope affect flow patterns, velocity, turbulence kinetic energy, turbulence intensity, and Reynolds shear stresses in the fishway. The weir geometries used in this study are similar to those typically used for river restoration projects. The use of a V-shaped rock weir was found to reduce the mean streamwise velocity in the pools by about 20% but more than double the maximum velocity magnitude. Two stage–discharge relationships were developed using the standard weir equation and a modified discharge coefficient to account for both flow over the weir and orifice flow through the base of the weir. The use of V-shaped rock weirs has the potential to offer significant advantages in assisting multispecies fish migration. The results of this study can be applied to the hydrotechnical design of pool and weir fishways with rock weirs and for river restoration projects.