Agency: European Commission | Branch: FP7 | Program: MC-ITN | Phase: PEOPLE-2007-1-1-ITN | Award Amount: 6.21M | Year: 2009
Understanding and controlling of interfacial phenomena in multiphase fluid dynamics remains one of the main challenges at the crossroad of Mathematics, Physics, Chemistry and Engineering. Examples include film flows, spreading and dewetting of (complex) liquids including suspensions, polymer solutions, liquid crystals, colloids and biofluids. Such systems are central for technological advances in the chemical, pharmaceutical, environmental and food industries and are crucial for the development of Microfluidics and Nanostructuring. The level of detail required by multi-scale flows with interfacial phenomena renders full-scale analyses practically impossible. In fact, such approaches often fail to describe even the results of simple experiments. MULTIFLOW will develop low-dimensional models capable of describing complex interfacial flows coupling different time and length scales. Based on the nature of the dominant mechanism, the scientific program will examine three generic classes: from nano- to macroscale, these are dominated by surface forces, reaction-diffusion, and advection. They are also affected by phase transitions, capillarity, chemical reactions, complex rheology and self-structuring. The strength of the network is its integration of all scientific disciplines, technical skills and expertise necessary to support the multi-scale nature of the envisaged research topics. By fostering the mobility and interdisciplinarity of a strong group of early-stage researchers through a set of well-defined objectives and effective networking between different institutions, disciplines and industries, the ultimate goals of this network are: (i) to create a multi-disciplinary, highly innovative and intersectorial training pool in the field of multi-scale interfacial fluid dynamics; (ii) to generate new tools and techniques for the theoretical-numerical-experimental investigation of such flows, which will be made available to the wider European Community.
Agency: European Commission | Branch: FP7 | Program: MC-ITN | Phase: FP7-PEOPLE-ITN-2008 | Award Amount: 2.58M | Year: 2009
Thermal management in innovative technology is a major problem to be solved, especially in novel electronic devices, such as further miniaturized microchips, hard disks and interfaces between biological structures (e.g. nerve cells) and semiconductor microstructures. In this Initial Training Network (ITN) we will train young researchers through an experimental/technological and theoretical approach to the application of a new highly efficient magnetic mode of thermal conduction for thermal management. This magnetic heat transport was discovered by members of this consortium and occurs in novel quasi-one dimensional insulating oxides. The crucial point of this project is that around room temperature the magnetic heat conductivity (of the order 100 W/Km) is as efficient as metallic heat conduction. Moreover, compared to conventional materials with high thermal conductivity, these novel compounds offer essential advantages: a) They are electrically insulating, b) heat is conducted primarily along one direction and c) heat is carried by localized spins which could allow for tunable heat conductivity at room temperature by manipulation of the spins with magnetic fields or light. Our scientific goal of exploiting this novel mode of heat transport for thermal management will be the basis for the research training in this ITN, which consists of 7 academic and 2 level-1 industrial partners. In order to tackle this scientific challenge in an multidisciplinary approach (physics, chemistry, materials science, computational science, electronic media), the fellows in our ITN will be trained on cutting edge experimental and theoretical techniques. In addition to training-through-research, the fellows will receive individual and collective training measures covering both scientific and complementary skills. We are especially dedicated to applying state-of-the-art training through electronic media which will reinforce the effectiveness and availability of training within this ITN.
Agency: European Commission | Branch: FP7 | Program: CP | Phase: FoF-ICT-2013.7.1 | Award Amount: 5.41M | Year: 2013
Simulation can significantly improve the competitive position of manufacturing and engineering companies by reducing their costs and resulting in more efficient development, production, procurement, logistics or financial processes. However, the take-up of simulation software by SMEs has until now been low due to high barriers of entry that include hardware prices, licensing costs and technical expertise. The CloudSME project will develop a cloud-based, one-stop-shop solution that will significantly lower these barriers, provide a scalable platform for small or larger scale simulations, and enable the wider take-up of simulation technologies in manufacturing and engineering SMEs. The CloudSME Simulation Platform will support end user SMEs to utilise customised simulation applications in the form of Software-as-a-Service (SaaS) based provision. Moreover, simulation software service providers and consulting companies will have access to a Platform-as-a-Service (PaaS) solution that enables them to quickly assemble custom simulation solutions in the cloud for their clients. The CloudSME Simulation Platform will be built on existing and proven technologies provided by the project partners and partially developed in previous European projects. Building on existing technology will enable the project to deliver its results quickly. The project consortium includes experienced partners, incorporating 12 SMEs, from cloud hardware and platform providers, to simulation software providers, end users and technology integrators. To guarantee greater impact of the developed solution, additional use-cases will be provided by a further 10 partners following an open call after the first year of the project. The CloudSME Simulation Platform will dramatically change the way in which manufacturing/engineering SMEs utilise simulation solutions today, and will provide new business opportunities not only to end-user SMEs, but also to simulation software and cloud service providers.\nA typical experimental scenario in the project is based around an insole design simulation program developed by one of the partners, used for designing tailored insoles for sports footwear and for people with foot problems. The end user company in the project has patented a method for scanning feet in 3D and the experiment will involve linking this to a cloud-based version of the simulation software to design insoles and simulate the interaction of feet and insoles. In turn, this design is loaded into a CNC machine to manufacture the insoles. The aim of the cooperation is to establish a portal through which scans can be uploaded to the cloud-based software service which then validates the scanned image to produce the design. The experiment will explore the extent to which the service supporting the lifecycle of tailored insole production can be achieved. This will immediately lead to extensions of the software for checking images within other industries unrelated to the footwear business.
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: Fission-2008-2.1.2 | Award Amount: 10.31M | Year: 2009
The target of the proposed NURISP Collaborative Project is to make new and significant steps towards a European Reference Simulation Platform for applications relevant to present PWR and BWR and to future reactors. The roadmap of this Simulation Platform will be proposed to be part of the future Strategic Research Agenda of the Sustainable Nuclear Energy Technology Platform (SNE-TP). The first step towards this ambitious target has been made during the FP6 NURESIM Integrated Project. The NURISP project will start from this basis and develop further the already common and well-proven NURESIM informatics platform. It will also strengthen and enlarge the united team of top level international experts already federated during the NURESIM project and it will transform it into a European pole of excellence in reactor safety computation. The platform will provide a more accurate representation of the physical phenomena by developing and incorporating into best estimate codes the latest advances in core physics, two-phase thermal-hydraulics and fuel modelling. The project will also develop significant capacities for multiscale and multiphysics calculations, and for deterministic and statistical sensitivity and uncertainty analysis, facilitating their use in a generic environment. The individual models, solvers and codes integrated into the platform will be verified, validated and demonstrated through benchmarks (some of them using NEA or IAEA databanks) corresponding to present and future PWR, VVER and BWR challenging applications. Through the Users Group, European Nuclear Utilities, Vendors, Technical Safety Organisations, Regulators, Universities and Research Labs will be able to share this reference tool, contribute to its qualification, and develop its potential; thus enabling an effective European Research Area to take a worldwide leading position in the numerical simulation of nuclear reactors.
Agency: European Commission | Branch: H2020 | Program: RIA | Phase: NFRP-01-2014 | Award Amount: 6.64M | Year: 2015
The thermal-hydraulics Simulations and Experiments for the Safety Assessment of Metal cooled reactor (SESAME) project supports the development of European liquid metal cooled reactors (ASTRID, ALFRED, MYRRHA, SEALER). The project focusses on pre-normative, fundamental, safety-related, challenges for these reactors with the following objectives: Development and validation of advanced numerical approaches for the design and safety evaluation of advanced reactors; Achievement of a new or extended validation base by creation of new reference data; Establishment of best practice guidelines, Verification & Validation methodologies, and uncertainty quantification methods for liquid metal fast reactor thermal hydraulics. The SESAME project will improve the safety of liquid metal fast reactors by making available new safety related experimental results and improved numerical approaches. These will allow system designers to improve the safety relevant equipment leading to enhanced safety standards and culture. Due to the fundamental and generic nature of SESAME, developments will be of relevance also for the safety assessment of contemporary light water reactors. By extending the knowledge basis, SESAME will allow the EU member states to develop robust safety policies. At the same time, SESAME will maintain and further develop the European experimental facilities and numerical tools. The consortium of 25 partners provides American-European-wide scientific and technological excellence in liquid metal thermal hydraulics, as well as full alignment with ESNII and with NUGENIA where of interest. A close interaction with the European liquid metal cooled reactor design teams is foreseen involving them in the Senior Advisory Committee. They will actively advise on the content of the project and will be the prime end-users, ensuring their innovative reactor designs will reach highest safety standards using frontier scientific developments.
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: Fission-2009-2.3.1 | Award Amount: 10.59M | Year: 2010
For the long-term development of nuclear power, innovative nuclear systems such as Gen-IV reactors and transmutation systems need to be developed for meeting future energy challenges. Thermal-hydraulics is recognized as a key scientific subject in the development of innovative reactor systems. This project is devoted to important crosscutting thermal-hydraulic issues encountered in various innovative nuclear systems, such as advanced reactor core thermal-hydraulics, single phase mixed convection and turbulence, specific multiphase flow, and code coupling and qualification. The main objectives of the project are: Generation of a data base for the development and validation of new models and codes describing the selected crosscutting thermal-hydraulic phenomena. This data base contains both experimental data and data from direct numerical simulations (DNS). Development of new physical models and modeling approaches for more accurate description of the crosscutting thermal-hydraulic phenomena such as heat transfer and flow mixing, turbulent flow modeling for a wide range of Prandtl numbers, and modeling of flows under strong influence of buoyancy. Improvement of the numerical engineering tools and establishment of a numerical platform for the design analysis of the innovative nuclear systems. This platform contains numerical codes of various classes of spatial scales, i.e. system analysis, sub-channel analysis and CFD codes, their coupling and the guidelines for their applications. The project will achieve optimum usage of available European resources in experimental facilities, numerical tools and expertise. It will establish a new common platform of research results and research infrastructure. The main outcomes of the project will be a synergized infrastructure for thermal-hydraulic research of innovative nuclear systems in Europe.
Agency: European Commission | Branch: FP7 | Program: CP | Phase: Fission-2012-2.1.1 | Award Amount: 9.33M | Year: 2013
After the 2011 disaster that occurred in Japan, improvement of nuclear safety appears more clearly as a paramount condition for further development of nuclear industry. The NURESAFE project addresses engineering aspects of nuclear safety, especially those relative to design basis accidents (DBA). Although the Japanese event was a severe accident, in a process of defense-in-depth, prevention and control of DBA is obviously one of the priorities in the process of safety improvement. In this respect, the best simulation software are needed to justify the design of reactor protection systems and measures taken to prevent and control accidents. The NURESAFE project addresses safety of light water reactors which will represent the major part of fleets in the world along the whole 21st century. The first objective of NURESAFE is to deliver to European stakeholders a reliable software capacity usable for safety analysis needs and to develop a high level of expertise in the proper use of the most recent simulation tools. Nuclear reactor simulation tools are of course already widely used for this purpose but more accurate and predictive software including uncertainty assessment must allow to quantify the margins toward feared phenomena occurring during an accident and they must be able to model innovative and more complex design features. This software capacity will be based on the NURESIM simulation platform created during FP6 NURESIM project and developed during FP7 NURISP project which achieved its goal by making available an integrated set of software at the state of the art. The objectives under the work-program are to develop practical applications usable for safety analysis or operation and design and to expand the use of the NURESIM platform. Therefore, the NURESAFE project concentrates its activities on some safety relevant situation targets. The main outcome of NURESAFE will be the delivery of multiphysics and fully integrated applications.
Labois M.,ASCOMP GmbH |
Lakehal D.,ASCOMP GmbH
Nuclear Engineering and Design | Year: 2011
A new turbulence modelling approach (Very-Large Eddy Simulation; V-LES) is developed and compared to conventional RANS and LES for a flow across a tube bundle. The method, which belongs to the large-scale simulation category, represents a good compromise between efficiency and precision, and may thus be used for industrial problems for which LES remains computationally expensive under high to very-high Reynolds number flow conditions. It can also be used for gas-liquid two-phase flows such as pressurized thermal shocks. The method is a sort of blend between U-RANS and LES, in that it resolves very large structures - way larger than the grid size - and models all subscale of turbulence using a two-equation model, by reference to RANS. The original model is shown here to share the same characteristics as the Detached Eddy Simulation (DES) approach, in that when the filter width is smaller than the wall-distance at which viscous effects are negligible (fμ = 1), the fixed filter width is replaced by the wall distance. First conclusions to be drawn from its extension here is that the flow must be resolved in three-dimensions, under transient conditions, with refined grids. Sensitivity to various computational parameters has been addressed: grid, filter width, domain size, and inflow conditions. This modelling strategy is proved to provide the flow unsteadiness in three-dimensions, while saving computational cost compared to LES. The method is computationally efficient (it can be applied using an implicit solver which permits a higher CFL than with LES; typically 1 versus 0.1), and numerically robust. The computational cost decreases with increasing filter width, though at the expenses of the quality of the results. © 2011 Elsevier B.V. All rights reserved.
Lakehal D.,ASCOMP GmbH
Nuclear Engineering and Design | Year: 2010
The paper centres on the use of the so-defined LEIS approach (Large-Eddy & Interface Simulation) for turbulent multifluid flows present in thermal-hydraulics applications. Interfacial flows involving deformable, sheared fronts separating immiscible fluids are shown to be within reach of this new approach, featuring direct resolution of turbulence and sheared interface deformations within the interface tracking (ITM) framework, such as level sets and VOF. In this technique supergrid turbulence and interfacial scales are directly solved whereas the sub-grid (SGS) parts are modelled, at least the turbulence part of it. First results are shown (feasibility), and difficulties and open issues are discussed. The connection between these two particular scales will also be discussed, and potential modelling routes evoked, including combining two-fluid and ITM, local grid refinement, or combing particle tracking and ITM for sub-grid inclusions smaller than the grid size. © 2009 Elsevier B.V. All rights reserved.
Lakehal D.,ASCOMP GmbH |
Labois M.,ASCOMP GmbH
International Journal of Multiphase Flow | Year: 2011
The paper presents a modelling strategy for phase-change heat transfer in turbulent interfacial two-phase flow. The computational framework is based on interface tracking ITM (level set approach), combined with large-scale prediction of turbulence, a new methodology known as Large-Eddy & Interface Simulation (LEIS), where super-grid scale turbulence and interfaces are directly solved, whereas the sub-scale parts are modelled. Because steady-state flow conditions are difficult to attain, recourse is made of the Very Large-Eddy Simulation (V-LES) instead of LES, where the flow-dependent cut-off filter is larger and independent from the grid. The computational approach is completed by a DNS-based interfacial phase-change heat transfer model built within the Surface Divergence (SD) theory. The original SD model is found to return better results when modified to account for scale separation, i.e. to segregate low-Re from high-Re number flow portions in the same flow. The model was first validated for an experiment involving a smooth to wavy turbulent, stratified steam-water flow in a 2D channel (Lim et al., 1984, Condensation measurement of horizontal concurrent steam-water flow, ASME J. Heat Transfer 106, 425-432.), revealing that the original SD model performs better for high interfacial shear rates. This screening phase also demonstrated that the most critical issue is the accurate prediction of the interfacial shear using ITM. The model was then applied successfully to predict condensing steam in the event of emergency core cooling in a Pressurized Water Reactor (PWR), where water is injected into the cold leg during a postulated loss-of-coolant-accident. The simulation results agree fairly well with the COSI (short for COndensation at Safety Injections) data (Janicot and Bestion, 1993, Condensation modelling for ECC injection, Nucl. Eng. Des. 145, 37-45). © 2011 Elsevier Ltd.