Search for dissertations about: "large-scale diffusion"

Showing result 11 - 15 of 61 swedish dissertations containing the words large-scale diffusion.

  2. 11. Low-energy buildings : energy use, indoor climate and market diffusion

    Author : Johannes Persson; Stefan Grönkvist; Svend Svendsen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; building energy simulations; energy efficiency gap; energy use; indoor climate; low-energy buildings;

    Abstract : Low-energy buildings have, in recent years, gained attention and moved towards a large-scale introduction in the residential sector. During this process, national and international criteria for energy use in buildings have become stricter and the European Union has through the Energy Performance of Buildings Directive imposed on member states to adapt their building regulations for ‘Nearly Zero Energy Buildings’, which by 2021 should be standard for new buildings. READ MORE

  4. 12. High Performance Finite Element Methods with Application to Simulation of Vertical Axis Wind Turbines and Diffusion MRI

    Author : Van Dang Nguyen; Johan Hoffman; Johan Jansson; Mats Larson; KTH; []
    Keywords : High performance finite element method; computational diffusion MRI; turbulent flow; vertical axis wind turbine; Cloud computing.; högprestanda finita elementmetod; beräkningsdiffusionsmagnetresonanstomografi; turbulent flöde; vertikalaxlad vindturbin; datormolnberäkning; Tillämpad matematik och beräkningsmatematik; Applied and Computational Mathematics; Biological Physics; Biologisk fysik; Computer Science; Datalogi; Engineering Mechanics; Teknisk mekanik; Mathematics; Matematik; Biological and Biomedical Physics; Biologisk och biomedicinsk fysik;

    Abstract : Finite element methods have been developed over decades, and together with the growth of computer power, they become more and more important in dealing with large-scale simulations in science and industry.The objective of this thesis is to develop high-performance finite element methods, with two concrete applications: computational fluid dynamics (CFD) with simulation of turbulent flow past a vertical axis wind turbine (VAWT), and computational diffusion magnetic resonance imaging (CDMRI). READ MORE

  5. 13. Interrogating Diffusional Mass and Charge Transport in Catalytic Metal-Organic Frameworks

    Author : Ben A. Johnson; Sascha Ott; Nicolas Plumeré; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; metal-organic frameworks; molecular catalysis; reaction-diffusion; electrochemistry; water oxidation; charge transport;

    Abstract : Molecular catalysts are efficient and selective for the electrochemical conversion of small molecules for energy conversion. Application of molecular species in a large-scale industrial setting requires stabilization in a heterogeneous support material. READ MORE

  6. 14. Multiscale models and simulations for diffusion and interaction in heterogeneous domains

    Author : Omar Malcolm Richardson; Adrian Muntean; Björn Engquist; Karlstads universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; multiscale modeling; finite element methods; interacting particle sytems; population dynamics; non-equilibrium dynamics; Matematik; Mathematics;

    Abstract : We investigate multiscale and multiphysics models for evolution systems in heterogeneous domains, with a focus on multiscale diffusions. Although diffusion is often studied in terms of continuum observables, it is a consequence of the motion of individual particles. READ MORE

  7. 15. REACTIVE TRANSPORT MODELLING OF DISSOLVED CO2 IN POROUS MEDIA : Injection into and leakage from geological reservoirs

    Author : Nawaz Ahmad; Anders Wörman; Auli Niemi; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CO2 geological storage and safety; leakage of brine saturated with dissolved CO2; reactive transport; fracture; advection; dispersion and diffusion; sorption; carbonate minerals kinetic reactions; calcite; dolomite; siderite; porosity; permeability; heat transport; Land and Water Resources Engineering; Mark- och vattenteknik;

    Abstract : The geological sequestration of carbon dioxide (CO2) is one of the options of controlling the greenhouse gas emissions. However, leakage of CO2 from the storage reservoir is a risk associated with geological sequestration. Over longer times, large-scale groundwater motion may cause leakage of dissolved CO2 (CO2aq). READ MORE