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  • 1.
    Do-Quang, Minh
    et al.
    KTH.
    Amberg, Gustav
    KTH.
    Numerical simulation of the coupling problems of a solid sphere impacting on a liquid free surface2010Ingår i: Mathematics and Computers in Simulation, ISSN 0378-4754, E-ISSN 1872-7166, Vol. 80, nr 8, s. 1664-1673Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a model, using a phase-field method, that is able to simulate the motion of a solid sphere impacting on a liquid surface, including the effects of capillary and hydrodynamic forces. The basic phenomena that were the subject of our research effort are the small scale mechanism such as the wetting property of the solid surface which control the large scale phenomena of the interaction. The coupled problem during the impact will be formulated by the inclusion of the surface energies of the solid surface in the formulation, which gives a reliable prediction of the motion of solid objects in/on/out of a liquid surface and the hydrodynamic behaviours at small scales when the inertia of fluid is less important than its surface tension. Numerical results at different surface wettabilities and impact conditions will be presented and compared with the experiments of Duez el al. [C. Duez, C. Ybert, C. Clanet, L. Bocquet, Nat. Phys. 3 (2007) 180-183] and Lee and Kim [D. Lee. H. Kim, Langmuir 24 (1) (2008) 142]. (C) 2009 IMACS. Published by Elsevier B.V. All rights reserved.

  • 2.
    Engblom, S.
    et al.
    Uppsala University.
    Do-Quang, Minh
    KTH.
    Amberg, Gustav
    KTH.
    Tornberg, Anna-Karin
    KTH.
    On diffuse interface modeling and simulation of surfactants in two-phase fluid flow2013Ingår i: Communications in Computational Physics, ISSN 1815-2406, E-ISSN 1991-7120, Vol. 14, nr 4, s. 879-915Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An existing phase-fieldmodel of two immiscible fluids with a single soluble surfactant present is discussed in detail. We analyze the well-posedness of the model and provide strong evidence that it is mathematically ill-posed for a large set of physically relevant parameters. As a consequence, critical modifications to the model are suggested that substantially increase the domain of validity. Carefully designed numerical simulations offer informative demonstrations as to the sharpness of our theoretical results and the qualities of the physical model. A fully coupled hydrodynamic test-case demonstrates the potential to capture also non-trivial effects on the overall flow.

  • 3. Jää-Aro, Kai-Mikael
    Implementing a CFD steering system for immersive environments2003Ingår i: CAVE Programming Workshop 2003, 2003Konferensbidrag (Övrigt vetenskapligt)
  • 4.
    Jää-Aro, Kai-Mikael
    et al.
    KTH.
    Engquist, Erik
    Visualization2005Ingår i: Introduction to High-Performance Computing—material for the PDC summerschool 2005 / [ed] Andersson, Ulf, Stockholm: Kungliga Tekniska högskolan, 2005Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 5.
    Jää-Aro, Kai-Mikael
    et al.
    KTH.
    Weber, Tomas
    Specification of methods of displaying CFD data, Specification of immersive user interface: VIRTUALFIRES : Deliverables 4.1 & 4.22002Rapport (Övrigt vetenskapligt)
  • 6. Lebedeva, Natalia F.
    et al.
    Zinovyev, Pavel V.
    Far Eastern Federal University. School of Natural Sciences. Department of Algebra, Geometry and Analysis.
    To a problem of allocation of surfaces of break in numerical methods dynamics of deformable medium2003Ingår i: Proceedings of the XXXI Summer School "Advanced Problems in Mechanics", St. Petersburg: Institute of Problems of Mechanical Engineering , 2003, s. 100-Konferensbidrag (Refereegranskat)
  • 7. Lebedeva (Лебедева), Natalia F.
    Одномерная автомодельная задача распространения ударных возмущений по несжимаемой упругой среде1993Ingår i: Проблемы естествознания и производства : Серия 5, Естественнонаучная, Vol. 113, s. 30-33Artikel i tidskrift (Refereegranskat)
  • 8. Lebedeva (Лебедева), Natalia F.
    et al.
    Burenin (Буренин), Anatoly A.
    Zinovyev (Зиновьев), Pavel V.
    Использование лучевой прифронтовой асимптотики в конструировании разностных схем расчетов динамики упругой среды2003Ingår i: СОВРЕМЕННЫЕ ПРОБЛЕМЫ МЕХАНИКИ И ПРИКЛАДНОЙ МАТЕМАТИКИ: материалы международной школы-семинараВоронежский государственный университет, Воронеж: Воронежский Государственный Университет , 2003, s. 38-46Konferensbidrag (Refereegranskat)
  • 9. Lebedeva (Лебедева), Natalia F.
    et al.
    Leuhina (Леухина), Yulia P.
    Mancibora (Манцибора), Aleksandr A.
    Одномерная задача взаимодействия плоско поляризованных сдвиговых ударных волн в несжимаемой упругой среде1996Ingår i: Проблемы естествознания и производства : Серия 5, Естественнонаучная, Vol. 117, s. 29-32Artikel i tidskrift (Refereegranskat)
  • 10. Lebedeva (Лебедева), Natalia F.
    et al.
    Zinovyev (Зиновьев), Pavel V.
    Использование прифронтовых разложений в конечно-разностной аппроксимации уравнений деформируемых сред2001Ingår i: Дальневосточная математическая школа-семинар имени академика Е. В. Золотова, Владивосток, 17-23 сент. 2001 г.: Тез. докл. / [ed] А. А. Илларионов; А. Ю. Чеботарев, Владивосток: Дальнаука , 2001, s. 75-76Konferensbidrag (Refereegranskat)
  • 11.
    Normark, Maria
    KTH.
    Using technology for real-time coordination of work: a study of work and artifact use in the everyday activities at SOS Alarm2002Licentiatavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Work in control rooms, or so-called Centers of coordination, places demands both on humans and technology. The people working there have to be able to make quick decisions as well as be alert during less busy times. The work has to be coordinated within the group, since the operators are much depending on each other's work. This places special demands on the technology; it should be fast, trustworthy and easy to manipulate so that the complexity of the work is reduced. This type of work has been a source of interest in the research area of Computer Supported Cooperative Work, especially so since the needs for real-time coordination is great in these settings.

    SOS Alarm is a company that is responsible for managing the telephone calls made to the emergency number 112 in Sweden. They have 20 centers covering Sweden. This thesis present an overview of the SOS operators work; how they coordinate the information and tasks between them; how the technology supports that work. This study presents a fully computerized setting, compared to many other studies of centers of coordination that are not.

    This ethnographic workplace study has been inspired by ethnomethodological perspectives as well as earlier field studies of work and technology use. Its main results are a description of the work practice and technology at two centers, implications for design of a new computer aided dispatch system that is currently developed at SOS Alarm and general design ideas for control rooms.

  • 12. Svensson, Gert
    et al.
    Jää-Aro, Kai-Mikael
    VIRTUALFIRES – realtidssimulering och visualisering av brandförlopp i tunnlar2003Konferensbidrag (Övrigt vetenskapligt)
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