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  • 1.
    Björk, Elisabeth
    et al.
    RISE, Innventia.
    Athley, Karin
    RISE, Innventia.
    Thomsson, Lars
    RISE, Innventia.
    Advanced techniques to study filler flocs in high shear environments2012Conference paper (Refereed)
  • 2. Carlsson, A.
    et al.
    Håkansson, K.
    Kvick, M.
    Lundell, F.
    RISE, Innventia.
    Söderberg, L.D.
    RISE, Innventia.
    Evaluation of steerable filter for detection of fibers in flowing suspensions2011In: Experiments in Fluids, ISSN 0723-4864, E-ISSN 1432-1114, no 4, p. 987-996Article in journal (Refereed)
  • 3.
    Danielsson, Sverker
    et al.
    RISE, Innventia.
    Holm, Richard
    RISE, Innventia.
    Öhman, Fredrik
    Lipnizki, Frank
    A novel approach for applied membrane filtration on processing flows2012Conference paper (Refereed)
  • 4.
    Faia, Pedro M.
    et al.
    University of Coimbra, Portugal; CEMUC Centre of Mechanical Engineering, Portugal.
    Krochak, Paul
    RISE, Innventia.
    Costa, Harold
    University of Coimbra, Portugal; CEMUC Centre of Mechanical Engineering, Portugal.
    Lundell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Silva, Rui
    University of Coimbra, Portugal; CIEPQPF Research Centre on Chemical Process and Forest Products, Portugal.
    Garcia, Fernando A. P.
    University of Coimbra, Portugal; CIEPQPF Research Centre on Chemical Process and Forest Products, Portugal.
    Rasteiro, Maria Graca
    University of Coimbra, Portugal; CIEPQPF Research Centre on Chemical Process and Forest Products, Portugal.
    A comparative study of magnetic resonance imaging, electrical impedance tomography and ultrasonic doppler velocimetry for semi-dilute fibre flow suspension characterisation2016In: International Journal of Computational Methods & Experimental Measurements, ISSN 2046-0546, E-ISSN 2046-0554, Vol. 4, no 2, p. 165-175Article in journal (Refereed)
    Abstract [en]

    Experimental comparisons between imaging techniques serve to provide confidence in the validity of each technique for the study of multiphase flow systems. Such cross-validation can establish the limitations of each technique quantitatively. In the present paper, the authors report efforts made on the characterization of semi-dilute, mono-dispersed suspensions of rayon fibres in turbulent water flow using Magnetic Resonance Imaging (MRI), Ultrasound Velocity Profiling (UVP) and Electrical Impedance Tomography (EIT). Increasing flow velocities and fibre concentration were studied using these three experimental techniques. For lower fibre concentrations more uniform distributions were observed and as flow velocity increased fibre agglomerations were found in the centre region of the pipe.

  • 5.
    Gram, Annika
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk. KTH Royal Institute of Technology, Sweden.
    Silfwerbrand, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk. KTH Royal Institute of Technology, Sweden.
    Lagerblad, Björn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk. KTH Royal Institute of Technology, Sweden.
    Particle motion in fluid: Analytical and numerical study2016In: Applied Rheology, ISSN 1430-6395, E-ISSN 1617-8106, Vol. 26, no 2Article in journal (Refereed)
    Abstract [en]

    Particle motion in fluid is discussed for one-particle systems as well as for dense suspensions, such as cementitious materials. The difference in large particle motion between larger particles and behaviour of fines (<125 μm) is explained, motion of one particle is shown by numerical simulation. It is concluded and highlighted that it is the particular motion of the fines that to a large extent contribute to the rheological properties of a suspension. It is also shown why larger ellipsoidal particles do not necessarily contribute to the increase of viscosity.

  • 6. Haldenwang, R.
    et al.
    Sutherland, A.P.N.
    Fester, V.G.
    Holm, R.
    RISE, Innventia.
    Chhabra, R.P.
    Sludge pipe flow pressure drop prediction using composite power-law friction factor-Reynolds number correlations based on different non-Newtonian Reynolds numbers2012In: Water S.A., ISSN 0378-4738, E-ISSN 1816-7950, no 4, p. 615-622Article in journal (Refereed)
  • 7. Håkansson, K.M.O.
    et al.
    Kvick, M.
    Lundell, F.
    RISE, Innventia.
    Prahl Wittberg, L.
    Söderberg, L.D.
    RISE, Innventia.
    Measurement of width and intensity of particle streaks in turbulent flows2013In: Experiments in Fluids, ISSN 0723-4864, E-ISSN 1432-1114, no 6, article id 1555Article in journal (Refereed)
  • 8.
    Jonasson, Hans G.
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad, Ljud och vibration.
    Storeheier, Svein
    SINTEF.
    Nord 2000. New Nordic prediction method for rail traffic noise2001Report (Other academic)
    Abstract [en]

    A new Nordic method to predict rail traffic noise is proposed. It is based on a complete

    separation of source emission and sound propagation. Each train is modelled as a number

    of point sources each with a certain sound power with or without directivity. The source

    model is connected to point source sound propagation theory to yield the sound pressure

    level in an arbitrary receiver position. The propagation model is based on accurate

    analytical models and it is capable of predicting propagation effects both with and

    without the influence of meteorological parameters. In this first version the prediction

    method has to rely on old data for the noise emission of trains.

  • 9.
    Jonasson, Hans G.
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Storeheier, Svein
    SINTEF.
    Nord 2000. New nordic prediction method for road traffic noise2001Report (Other academic)
    Abstract [en]

    A new Nordic method to predict road traffic noise is proposed. It is based on a complete

    separation of source emission and sound propagation. Each vehicle is modelled as a

    number of point sources each with a certain sound power with or without directivity. The

    source model is connected to point source sound propagation theory to yield the sound

    pressure level in an arbitrary receiver position. The propagation model is based on

    accurate analytical models and it is capable of predicting propagation effects both with

    and without the influence of meteorological parameters.

  • 10.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Holm, Richard
    Hirota, Masato
    Lundell, Fredrik
    Söderberg, Daniel
    A comparative study of semi-dilute fibre suspension flow using magnetic resonance imaging and ultrasonic Doppler velocimetry: differences between fluid and fibre motion2013Conference paper (Refereed)
  • 11. Li, Ying Zhen
    Study of fire and explosion hazards of alternative fuel vehicles in tunnels2018Report (Other academic)
    Abstract [en]

    An investigation of fire and explosion hazards of different types of alternativefuel vehicles in tunnels is presented. The different fuels are divided into four types:liquid fuels, liquefied fuels, compressed gases, and electricity, and detailed parameters are obtained. Three types offire hazards for the alternativefuel vehicles: pool fires, jet fires and fireballs are identified andinvestigated in detail. Fromthe perspective of pool fire size, the liquid fuels pose equivalent or evenmuch lower fire hazards compared to the traditionally used fuels, but theliquefied fuels may pose higher hazards. For pressurized tanks, the fires are generally much larger in size butshorter in duration. The gas releases from pressure relief devices and the resulting jet firesare highly transient. Forhydrogen vehicles, the fire sizes are significantly higher compared to CNGtanks, while flame lengths only slighter longer. Investigation of the peakoverpressure in case of an explosion in a tunnel was also carried out. Theresults showed that, for the vehicles investigated, the peak overpressure of tankrupture and BLEVE are mostly in a range of 0.1 to 0.36 bar at 50 m away. Thesituations in case of cloud explosion are mostly much more severe andintolerable. These hazards need to be carefully considered in both vehiclesafety design and tunnel fire safety design. Further researches on thesehazards are in urgent need.

  • 12.
    Li, Ying Zhen
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Ingason, Haukur
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Analysis of Muskö tunnel fire flows with automatic sprinkler activation2017Report (Other academic)
    Abstract [en]

    The focus of the present study is analyzing the best position of a sprinkler nozzle in a tunnel cross-section in the Muskö tunnel, south of Stockholm, Sweden. Activation of the sprinklers installed along the centerline and along the sidewall is investigated through analysis of full scale experiments and by three dimensional numerical modelling. Then the tunnel velocity is analyzed by one dimensional numerical modelling for various fire locations in the Muskö tunnel. For both activating the automatic sprinklers nearby the fire and avoiding activation of the sprinklers further downstream, the automatic sprinklers are recommended to be installed along the centerline of the tunnel. It has also been found that the tunnel velocity varies significantly with the fire location. When the fire is on the left side of the tunnel, the flow velocity mostly remains in a range of 1 m/s (positive or negative) within the first 10 minutes, which helps early activation of the automatic sprinklers. When the fire is on the right side of the tunnel, the flow velocity mostly remains within a range of -1 m/s and 1 m/s within the first 5 minutes, and the velocity mostly increases to 2 m/s at around 10 min. Therefore, the scenario for fire located on the left side is better than that for fire on the right side, especially when it is located between the middle of the right section and the right portal. As one typical case with fire on the right side, the tunnel velocity maintains at 1 m/s for the first 5 min and gradually increases to 2 m/s at 10 min. Under such conditions, the automatic sprinkler system is expected to perform well. 

  • 13.
    Li, Ying Zhen
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Ingason, Haukur
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Jiang, Lei
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Influence of tunnel slope on smoke control2018Report (Other academic)
    Abstract [en]

    The critical velocity and backlayering length in sloped tunnels are investigated by numerical simulations using FDS. Simulation in two full-scale tunnels, with negative slopes ranging up to -18 % and heat release rates from 5 to 100 MW were carried out.

    The results show that NFPA 502 equation significantly overestimates the effect of negative slopes.

    The equation proposed by Atkinson and Wu is found to be in closer agreement with the results. A simplified correlation, i.e. Eq. (12), is proposed and recommended for practical use.

    The previous correlation for dimensionless backlayering length, Eq. (3), is valid for tunnels of various slopes and aspect ratios, and can be used for prediction of backlayering length.

  • 14. Lundell, F.
    et al.
    Söderberg, L.D.
    RISE, Innventia.
    Alfredsson, P.H.
    Fluid mechanics of papermaking2011In: Annual Review of Fluid Mechanics, ISSN 0066-4189, E-ISSN 1545-4479, p. 195-217Article in journal (Refereed)
  • 15.
    Olsson, Jörgen
    RISE, Sweden; Linneaus Universtiy, Sweden.
    Low Frequency Impact Sound in Timber Buildings: Simulations and Measurements2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    An increased share of construction with timber is one possible way of achieving more sustainable and energy-efficient life cycles of buildings. The main reason is that wood is a renewable material and buildings require a large amount of resources. Timber buildings taller than two storeys were prohibited in Europe until the 1990s due to fire regulations. In 1994, this prohibition was removed in Sweden.

        Some of the early multi-storey timber buildings were associated with more complaints due to impact sound than concrete buildings with the same measured impact sound class rating. Research in later years has shown that the frequency range used for rating has not been sufficiently low in order to include all the sound characteristics that are important for subjective perception of impact sound in light weight timber buildings. The AkuLite project showed that the frequency range has to be extended down to 20 Hz in order to give a good quality of the rating. This low frequency range of interest requires a need for knowledge of the sound field distribution, how to best measure the sound, how to predict the sound transmission levels and how to correlate numerical predictions with measurements.

        Here, the goal is to improve the knowledge and methodology concerning measurements and predictions of low frequency impact sound in light weight timber buildings. Impact sound fields are determined by grid measurements in rooms within timber buildings with different designs of their joist floors. The measurements are used to increase the understanding of impact sound and to benchmark different field measurement methods. By estimating transfer functions, from impact forces to vibrations and then sound pressures in receiving rooms, from vibrational test data, improved possibilities to correlate the experimental results to numerical simulations are achieved. A number of excitation devices are compared experimentally to evaluate different characteristics of the test data achieved. Further, comparisons between a timber based hybrid joist floor and a modern concrete floor are made using FE-models to evaluate how stiffness and surface mass parameters affect the impact sound transfer and the radiation.

        The measurements of sound fields show that light weight timber floors in small rooms tend to have their highest sound levels in the low frequency region, where the modes are well separated, and that the highest levels even can occur below the frequency of the first room mode of the air. In rooms with excitation from the floor above, the highest levels tend to occur at the floor levels and in the floor corners, if the excitation is made in the middle of the room above. Due to nonlinearities, the excitation levels may affect the transfer function in low frequencies which was shown in an experimental study. Surface mass and bending stiffness of floor systems are shown, by simulations, to be important for the amount of sound radiated.

        By applying a transfer function methodology, measuring the excitation forces as well as the responses, improvements of correlation analyses between measurements and simulations can be achieved.

  • 16.
    Roussel, Nicolas
    et al.
    University of Paris-Est, France.
    Gram, Annika
    RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Hållbara byggnadsverk.
    Cremonesi, Massimiliano
    Polytechnic University of Milan, Italy.
    Ferrara, Liberato
    Polytechnic University of Milan, Italy.
    Krenzer, Knut
    IAB Weimar GmbH, Germany.
    Mechtcherine, Viktor
    TU Dresden, Germany.
    Shyshko, Sergiy
    TU Dresden, Germany.
    Skocec, Jan
    Heidelberg Cement Technology Center GmbH, Germany.
    Spangenberg, Jon
    DTU Technical University of Denmark, Denmark.
    Svec, Oldrich
    DTU Technical University of Denmark, Denmark.
    Nyholm Thrane, Lars
    Danish Technological Institute, Denmark.
    Vasilic, Ksenija
    BAM Federal Institute for Material Research and Testing, Germany.
    Numerical simulations of concrete flow: A benchmark comparison2016In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 79, p. 265-271Article in journal (Refereed)
    Abstract [en]

    First, we define in this paper two benchmark flows readily usable by anyone calibrating a numerical tool for concrete flow prediction. Such benchmark flows shall allow anyone to check the validity of their computational tools no matter the numerical methods and parameters they choose. Second, we compare numerical predictions of the concrete sample final shape for these two benchmark flows obtained by various research teams around the world using various numerical techniques. Our results show that all numerical techniques compared here give very similar results suggesting that numerical simulations of concrete filling ability when neglecting any potential components segregation have reached a technology readiness level bringing them closer to industrial practice.

  • 17.
    Silva, Rui
    et al.
    University of Coimbra, Portugal.
    Garcia, Fernando A. P.
    University of Coimbra, Portugal.
    Faia, Pedro M.
    University of Coimbra, Portugal; CEMUC Centre of Mechanical Engineering, Portugal.
    Krochak, Paul
    RISE, Innventia.
    Söderberg, Daniel
    KTH Royal Institute of Technology, Sweden.
    Lundell, Fredrik
    KTH Royal Institute of Technology, Sweden.
    Rasteiro, Maria Graca
    University of Coimbra, Portugal.
    Validating dilute settling suspensions numerical data through MRI, UVP and EIT measurements2016In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, Vol. 50, p. 35-48Article in journal (Refereed)
    Abstract [en]

    The measurement of fluid dynamic quantities are of great interest both for extending the range of validity of current correlations to be used in equipment design and for verification of fundamental hydrodynamic models. Studies where comparisons are made between imaging techniques serve to provide confidence on the validity of each technique for the study of multiphase flow systems. The advantage of cross-validation is that it can help establish the limitations of each technique and the necessary steps towards improvement. A small amount of comparative studies are found in the literature and none of them reports the study of settling particles suspension flow using simultaneously Ultrasonic Velocity Profiling (UVP), Magnetic Resonance Imaging (MRI) and Electrical Impedance Tomography (EIT), at least not to the best of the authors knowledge. In the present paper the authors report efforts made on the characterization of dilute suspensions of glass particles in turbulent flow, with increasing flow velocities and particles concentrations, in a pilot rig at a laboratorial scale, using both MRI, EIT and UVP: direct comparisons of EIT, MRI and UVP measurements acquired and mixture model numerical simulations are presented and the level of agreement explored.

  • 18.
    Sjölund, Johannes
    et al.
    RISE - Research Institutes of Sweden, ICT, SICS. Luleå University of Technology, Sweden.
    Mattias, Vesterlund
    RISE - Research Institutes of Sweden, ICT, SICS.
    Nicolas, Delbosc
    Dassault Systemes Madrid, Spain.
    Khan, Amirul
    University of Leeds, UK.
    Summers, Jon
    RISE - Research Institutes of Sweden, ICT, SICS. University of Leeds, UK.
    Validated thermal air management simulations ofdata centers using remote graphics processing units2018Conference paper (Refereed)
    Abstract [en]

    Simulation tools for thermal management of datacenters help to improve layout of new builds or analyse thermalproblems in existing data centers. The development of LBMon remote GPUs as an approach for such simulations is discussedmaking use of VirtualGL and prioritised multi-threadedimplementations of an existing LBM code. The simulation isconfigured to model an existing and highly monitored test datacenter. Steady-state root mean square averages of measured andsimulated temperatures are compared showing good agreement.The full capability of this simulation approach is demonstratedwhen comparing rack temperatures against a time varyingworkload, which employs time-dependent boundary conditions.

  • 19.
    Söderberg, D.
    RISE, Innventia.
    Fluid dynamic challenges of future nano cellulose fiber processes2011Conference paper (Refereed)
  • 20. Tammisola, O.
    et al.
    Lundell, F.
    RISE, Innventia.
    Schlatter, P.
    Wehrfritz, A.
    Söderberg, L.D.
    RISE, Innventia.
    Global linear and nonlinear stability of viscous confined plane wakes with co-flow2011In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, p. 397-434Article in journal (Refereed)
  • 21. Tammisola, O.
    et al.
    Lundell, F.
    RISE, Innventia.
    Söderberg L., D
    RISE, Innventia.
    Surface tension-induced global instability of planar jets and wakes2012In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, p. 632-658Article in journal (Refereed)
  • 22. Tammisola, O.
    et al.
    Lundell, F.
    RISE, Innventia.
    Söderberg, L.D.
    RISE, Innventia.
    Effect of surface tension on global modes of confined wake flows2011In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, no 1, article id 14108Article in journal (Refereed)
  • 23. Wittberg, L.P.
    et al.
    Björkman, M.
    Khokhar, G.
    Mohlin, U.-B.
    RISE, Innventia.
    Dahlkild, A.
    Flow conditions in the grooves of a Low-Consistency refiner2012In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, no 2, p. 173-183Article in journal (Refereed)
  • 24.
    Xu, Hui
    et al.
    Imperial College London, UK.
    Cantwell, Chris D.
    Imperial College London, UK.
    Monteserin, Carlos
    DTU Technical University of Denmark, Denmark.
    Eskilsson, Claes
    RISE - Research Institutes of Sweden, Safety and Transport, Safety. Aalborg University, Denmark.
    Engsig-Karup, Allan P.
    DTU Technical University of Denmark, Denmark.
    Sherwin, Spencer J.
    Imperial College London, UK.
    Spectral/hp element methods: Recent developments, applications, and perspectives2018In: Journal of Hydrodynamics, ISSN 1001-6058, E-ISSN 1000-4874, Vol. 30, no 1, p. 1-22Article in journal (Refereed)
    Abstract [en]

    The spectral/hp element method combines the geometric flexibility of the classical h-type finite element technique with the desirable numerical properties of spectral methods, employing high-degree piecewise polynomial basis functions on coarse finite element-type meshes. The spatial approximation is based upon orthogonal polynomials, such as Legendre or Chebychev polynomials, modified to accommodate a C0 - continuous expansion. Computationally and theoretically, by increasing the polynomial order p , high-precision solutions and fast convergence can be obtained and, in particular, under certain regularity assumptions an exponential reduction in approximation error between numerical and exact solutions can be achieved. This method has now been applied in many simulation studies of both fundamental and practical engineering flows. This paper briefly describes the formulation of the spectral/hp element method and provides an overview of its application to computational fluid dynamics. In particular, it focuses on the use of the spectral/hp element method in transitional flows and ocean engineering. Finally, some of the major challenges to be overcome in order´to use the spectral/hp element method in more complex science and engineering applications are discussed

  • 25.
    Yang, L.
    RISE, Innventia.
    A physical model for liquid movement into a porous substrate under the action of a pressure pulse2013In: Nordic Pulp and Paper Research Journal, ISSN 0283-2631 , no 1, p. 94-100Article in journal (Refereed)
1 - 25 of 25
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