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  • 1.
    Burger, Gregor
    et al.
    Unit of Environmental Engineering, University of Innsbruck.
    Bach, Peter M.
    Monash Infrastructure Research Institute, Monash University, Melbourne, VIC, Cooperative Research Centre (CRC) for Water Sensitive Cities.
    Urich, Christian
    Unit of Environmental Engineering, University of Innsbruck, CRC for Water Sensitive Cities, Monash University, Melbourne, VIC.
    Leonhardt, Günther
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water. Unit of Environmental Engineering, University of Innsbruck.
    Kleidorfer, Manfred
    Unit of Environmental Engineering, University of Innsbruck.
    Rauch, Wolfgang
    Unit of Environmental Engineering, University of Innsbruck.
    Designing and implementing a multi-core capable integrated urban drainage modelling Toolkit: Lessons from CityDrain32016In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 100, p. 277-289Article in journal (Refereed)
    Abstract [en]

    Integrated urban drainage modelling combines different aspects of the urban water system into a common framework. With increasing pressures of a changing climate, urban growth and economic constraints, the need for wider spread integration is necessary in the interest of a sustainable future. Greater complexity results in greater computational burden but modelling packages will, likewise, need to be flexible enough to allow incorporation of new algorithms. With advancements in modern information technology, a parallel implementation of such a modelling toolkit is mandatory while still leaving its users the flexibility of extensions. The design and implementation of the integrated modelling framework CityDrain3 shows that it is possible to write research code that is high-performance and extensible by many research projects. Three use case scenarios are presented to showcase the application of CityDrain3. The performance advantage of parallelization (up to 40 times compared to its predecessor) and the scalability of the framework are also demonstrated.

  • 2. Haoxue, Ma
    et al.
    Johansson, Henrik
    Orsborn, Kjell
    Uppsala universitet.
    Distribution and synchronisation of engineering information using active database technology2005In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 36, no 11-12, p. 720-728Article in journal (Refereed)
    Abstract [en]

    Today, work collaboration is normal practice in developing modern products. Engineering collaborative work involves a number of team members that need to share and exchange design ideas while working with engineering analysis tools such as mechanical computer aided engineering systems. This work presents the M-Sync prototype system that uses an active database approach to enable exchange of engineering information among distributed team members in a timely manner. The distributed data is fully accessible by the local member and is automatically synchronised between different places using a database management system that support event-condition-action (ECA) database rules. Only updates introduced at one location are distributed to other locations, thereby minimizing information transfer and enhancing performance. Members working at different locations can therefore work in a peer-to-peer (P2P) manner and interactively manipulate the same set of information at the same time.

  • 3.
    Hellström, Gunnar
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
    Marjavaara, Daniel
    Lundström, Staffan
    Parallel CFD simulations of an original and redesigned hydraulic turbine draft tube2007In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 38, no 5, p. 338-344Article in journal (Refereed)
    Abstract [en]

    The design of hydraulic turbine draft tubes has traditionally been based on simplified analytic methods, model and full-scale experiments. In the recent years the use of numerical methods such as computational fluid dynamics (CFD) has increased in the design process, due to the rapid escalation in computer performance. Today with parallel computer architectures, new aspects of flow can be considered. However, several problems have still to be solved before CFD can routinely be applied in product development. This paper aims to investigate the parallel performance of commercial CFD software on homogeneous computer networks, as common solutions encountered in the industry today. In addition, the efficiency improvements obtained in earlier experiments by modifying the shape of the draft tube will be considered, to deduce if the improvements can be captured with aid of CFD. Results from both the steady and the unsteady CFD simulations show that almost full scalability is obtained with the commercial CFD software CFX-5.7.1. Furthermore, no noticeable improvement in the pressure recovery factor or the flow field is noticed in the CFD simulations as compared to experiments. The discrepancy may be to the applied inlet boundary conditions and/or the turbulence model.

  • 4. Johansson, Henrik
    et al.
    Åström, Peter
    Orsborn, Kjell
    Kungliga tekniska högskolan, KTH.
    A system for information management in simulation of manufacturing processes2004In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 35, no 10-11, p. 725-733Article in journal (Refereed)
    Abstract [en]

    A system has been developed to manage simulation information of manufacturing processes, such as mesh information, boundary conditions and process parameters. The goal is to enable information sharing and exchange to make it possible to simulate a whole chain of manufacturing processes, and thereby predict how a modification in one manufacturing process affects the characteristics of the final product. The system has been used to predict successful simulation of a cutting process using mesh information and process parameters. An object-relational database management system is embedded in the system that uses a conceptual EXPRESS schema as database schema. The database management system is lightweight main-memory resident and incorporates an extensible and object-oriented query language. Uniform storage using database technology enables information manipulation independently of any specific simulation tool.

  • 5.
    Mattsson, Hans
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Axelsson, Kennet
    Luleå University of Technology.
    Klisinski, M.
    Luleå University of Technology.
    On a constitutive driver as a useful tool in soil plasticity1999In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 30, no 8, p. 511-528Article in journal (Refereed)
    Abstract [en]

    A mathematical basis for the development of constitutive drivers in soil plasticity has been proposed by the authors. A constitutive driver is here understood as a computer program, containing a number of selected constitutive models, in which different laboratory and field tests can be simulated and model parameters optimised. As a pilot study of the mathematical concept, a constitutive driver for soils, in the form of a PC-program, has been developed. The paper discusses this particular program, i.e. its structure, the mathematical basis, included soil models and some application examples, to give an idea of how a general and user-friendly constitutive driver can be designed. Such a program can be used for practical, research and educational purposes. In fact, it is believed that so many important applications for constitutive drivers exist that it would be beneficial if such programs were easily accessible as complementary programs in commercial software.

  • 6.
    Nyström, Mattias
    et al.
    Luleå tekniska universitet.
    Orsborn, Kjell
    Uppsala universitet.
    Computational database technology for component mode synthesis2004In: Advances in Engineering Software, ISSN 0965-9978, E-ISSN 1873-5339, Vol. 35, no 10-11, p. 735-45Article in journal (Refereed)
    Abstract [en]

    The present work show how object relational database management system technology can be used to support an finite element analysis process that includes component mode synthesis using the Craig–Bampton method for calculating reduced mass and stiffness matrices. A general object-oriented model for accessing matrix data independent of matrix representation is presented. The model is used to express the calculations of the reduced stiffness and mass matrices in a declarative query language and thereby letting the database decide how to execute the operations and manage the memory.

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