Sökning: "multiphase flow"

Visar resultat 1 - 5 av 26 uppsatser innehållade orden multiphase flow.

  1. 1. CFD Simulation of Fluid Flow During Laser Metal Wire Deposition using OpenFOAM : 3D printing

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Jennifer Lundkvist; [2019]
    Nyckelord :;

    Sammanfattning : The focus of this work was to simulate the fluid flow within a melt pool geometry, during an additive manufacturing process, implementing the CFD software OpenFOAM version 1806. Two separate models were created and run during this work, the first using a temperature mapping from a finite element (FE) model and the second being a free-standing model with Gaussian distributed laser beam striking down on the top surface. LÄS MER

  2. 2. CFD-simulations of urea-waterspray in an after-treatment systemusing Star-CCM+

    Master-uppsats, KTH/Mekanik

    Författare :Emelie Trigell; [2018]
    Nyckelord :after-treatment systems; selective catalytic reaction SCR ; AdBlue; multiphase flow; multi-component liquid; Unsteady Reynolds Average Navier Stokes RANS ; wall film formation; solid deposits; efterbehandlingssystem; selektiva katalytiska reaktioner; AdBlue; flerfasstr ¨ommning; flerkomponentvätska; Unsteady Reynolds Average Navier Stokes; väggfilm; avlagringar;

    Sammanfattning : The legislation has forced the vehicle industry to reduce tail-end emissions. The air pollutant nitrogen oxide (NOX) has been shown to have a negative impact on human health and the environment. One of the key technologies to reduce the levels of NOX emitted from a vehicle is by implementing an after-treatment system. LÄS MER

  3. 3. CFD simulation of dip-lubricated single-stage gearboxes through coupling of multiphase flow and multiple body dynamics : an initial investigation

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Nasir Imtiaz; [2018]
    Nyckelord :transmissions; churning losses; CFD; STAR-CCM ; FZG gearbox; planetary gearbox; RBM; MRF; unsteady framework; VOF; immiscible; overset meshing technique;

    Sammanfattning : Transmissions are an essential part of a vehicle powertrain. An optimally designed powertrain can result in energy savings, reduced environmental impact and increased comfort and reliability. Along with other components of the powertrain, efficiency is also a major concern in the design of transmissions. LÄS MER

  4. 4. Modelling of the gas flow in fluidized beds

    H-uppsats, Chalmers tekniska högskola/Institutionen för energi och miljö

    Författare :Federica Gioia; [2017]
    Nyckelord :CCS; Emissions; Fluidized bed; Gas mixing; Multiphase flow;

    Sammanfattning : Fluidized bed technology plays an important role in the transition of the current energy system to full sustainability, both as main first choice for thermochemical biomass conversion (which is considered CO2 neutral) and as basis for chemical looping combustion (CLC), which is considered to be the second generation of carbon capture applications, since it allows CO2 capture with no inherent energy penalty.The aim of the work is to formulate and implement a proper description of the gas flow inside a fluidized bed, covering a variety of scales and applications. LÄS MER

  5. 5. A Cut Finite Element Method for Partial Differential Equations on Evolving Surfaces

    Master-uppsats, KTH/Numerisk analys, NA

    Författare :Johan Wärnegård; [2016]
    Nyckelord :;

    Sammanfattning : This thesis deals with cut finite element methods (CutFEM) for solving partial differential equations (PDEs) on evolving interfaces. Such PDEs arise for example in the study of insoluble surfactants in multiphase flow. In CutFEM, the interface is embedded in a larger mesh which need not respect the geometry of the interface. LÄS MER