Blar i NTNU Open på forfatter "Müller, Bernhard"

Viser treff 21-40 av 47

    • Immersed boundary method for the compressible Navier-Stokes equations using high order summation-by-parts difference operators 

      Khalili, Mohammadtaghi; Larsson, Martin; Müller, Bernhard (Chapter, 2017)
      A ghost-point immersed boundary method is devised for the compressible Navier–Stokes equations by employing high order summation-by-parts (SBP) difference operators. The immersed boundaries are treated as sharp interfaces ...

    • Immersed boundary method for viscous compressible flows around moving bodies 

      Khalili, Mohammadtaghi; Larsson, Martin; Müller, Bernhard (Journal article; Peer reviewed, 2018)
      A ghost-point immersed boundary method for the compressible Navier–Stokes equations with moving boundaries on fixed Cartesian grids is devised by employing high order summation-by-parts (SBP) difference operators. The ...

    • Improvement of Immersed Boundary Method for Biofluid Dynamics 

      Lindtveit, Terje Tybring (Master thesis, 2023)
      I denne masteroppgaven presenteres en høyordens skarp grenses "immersed boundary" metode utviklet for varmeligningen. Metoden er basert på en andre ordens "finite difference" løser hvor geometriene er representert ved hjelp ...

    • Influence of surfactants on the electrohydrodynamic stretching of water drops in oil 

      Ervik, Åsmund; Penne, Torstein Eidsnes; Hellesø, Svein Magne; Munkejord, Svend Tollak; Müller, Bernhard (Journal article; Peer reviewed, 2017)
      In this paper we present experimental and numerical studies of the electrohydrodynamic stretching of a sub-millimetre-sized salt water drop, immersed in oil with added non-ionic surfactant, and subjected to a suddenly ...

    • Interface Tracking for 3D Immersed Boundary Method in Biofluid Dynamics 

      Sommersel, Marcus (Master thesis, 2022)
      Obstruktiv søvnapné er et medisinsk problem forårsaket av kollaps i de øvre luftveiene som begrenser oksygentilførselen under søvn, som fører til økt dødelighet og senket livskvalitet. For øyeblikket finnes det kirurgiske ...

    • Investigation of CFD Simulations of Flow in the Upper Airways 

      Aasgrav, Elin (Master thesis, 2017)
      This Master s thesis extends previous work conducted in the collaboration project called Modelling of obstructive sleep apnea by fluid-structure interaction in the upper airways. The main objective of the current work was ...

    • Kartesiske grid metode for kompressibel strømning over oscillerende vingeprofiler. 

      Helverschou, Carsten Berge (Master thesis, 2013)
      Et program har blitt utviklet for å løse de todimensjonale kompressible Eulerligningenefor strømninger over et oscillerende flyprofil. En Kartesisk gitter-metode er blitt benyttet, som gjør det nødvendig å behandle ...

    • Large Time Step Explicit Schemes for Partial Differential Evolution Equations 

      Solberg, Anders Aase (Master thesis, 2016)
      We consider the large time step (LTS) method for hyperbolic conservation laws, originally proposed by LeVeque in a series of papers over thirty years ago. In particular we have designed a local multi-point LTS scheme, ...

    • Large time step HLL and HLLC schemes 

      Prebeg, Marin; Flåtten, Tore Halsne; Müller, Bernhard (Journal article; Peer reviewed, 2018)
      We present Large Time Step (LTS) extensions of the Harten-Lax-van Leer (HLL) and Harten-Lax-van Leer-Contact (HLLC) schemes. Herein, LTS denotes a class of explicit methods stable for Courant numbers greater than one. The ...

    • Large Time Step Methods for Hyperbolic Conservation Laws 

      Prebeg, Marin (Doctoral theses at NTNU;2017:285, Doctoral thesis, 2017)
      The HLL (Harten–Lax–van Leer) and HLLC (HLL–Contact) schemes are extended to LTS-HLL(C) schemes. The LTS-HLL-type schemes for scalar conservation laws are defined in the numerical viscosity, flux-difference splitting and ...

    • Large Time Step Methods for Hyperbolic Partial Differential Equations 

      Nygaard, Rolf (Master thesis, 2017)
      In this thesis we consider explicit finite volume methods that are not limited by the Courant-Friedrichs-Lewy (CFL) condition, referred to as large time step (LTS) methods. LeVequeproposed the first LTS method in the 1980 ...

    • Large Time Step Roe scheme for a common 1D two-fluid model 

      Prebeg, Marin; Flåtten, Tore; Müller, Bernhard (Journal article; Peer reviewed, 2017)
      We present the Large Time Step (LTS) extension of the Roe scheme and apply it to a standard two-fluid model. Herein, LTS denotes a class of explicit methods that are not limited by the CFL (Courant–Friedrichs–Lewy) condition, ...

    • Mathematical Modelling and Simulation of Flow in Collapsible Tubes 

      Akbar, Batool (Master thesis, 2022)
      Obstruktiv søvnapné (OSA) er en tilstand som midlertidig blokkerer luftstrømmen gjennom de øvre luftveiene under søvn for de som er rammet. Denne vanlige tilstanden kan redusere søvn og livskvalitet, og til og med føre til ...

    • Modeling and Simulation of Respiratory Flow 

      Hansen, Anna Helene Symington (Master thesis, 2019)
      I denne masteroppgaven presenteres, implementeres, testes og diskuteres en forenklet modell for å simulere respiratorisk strømning. Initialbetingelser og grensebetingelser for både stabile og ustabile strømninger er lagt ...

    • Models and numerical methods for two-phase flow of CO2 in pipes 

      Reinertsen, Aleksander (Master thesis, 2015)
      Key to the transport phase of carbon capture and storage (CCS) is understanding the behavior of liquid or supercritical CO2 in pipelines, and the consequences of cracks and pipe depressurization. It is therefore useful to ...

    • Numerical Simulation of Fluid- Structure Interaction 

      Aasli, Einar (Master thesis, 2021)
      I denne masteroppgaven blir en høyere ordens ghost point immersed boundary metode (GPIBM) designet for kompressibel strømning og fluid-strukturinteraksjon (fluid-structure in- teraction, FSI) applikasjoner redusert til ...

    • Numerical Study of the Interaction of Flow over Two Airfoils in Relative Motion 

      Tveiterås, Vebjørn (Master thesis, 2011)
      Computational fluid dynamics (CFD) was be used to investigate aspects of interaction of flow over two airfoils in relatie motion in detail.%Problem statement2D tandem airfoil setups were studied, where the leading airfoil ...

    • Numerisk simulering av strømning rundt vingeprofil NREL S826 ved moderate Reynoldstall ved hjelp av løsnet vivel simulering (DES) 

      Prytz, Eirk Rasmussen; Huuse, Øyvind (Master thesis, 2016)
      In this study computational fluid dynamics (CFD) was used to simulate the flow around the asymmetric NREL S826 airfoil. ANSYS Fluent v.16.2 was used as the CFD solver, while ANSYS Meshing was used for creating the grids. The ...

    • One-Dimensional Annular Diffuser Model for Preliminary Turbomachinery Design 

      Agromayor, Roberto; Müller, Bernhard; Nord, Lars O. (Journal article; Peer reviewed, 2019)
      Annular diffusers are frequently used in turbomachinery applications to recover the discharge kinetic energy and increase the total-to-static isentropic efficiency. Despite its strong influence on turbomachinery performance, ...

    • Patient specific numerical simulation of flow in the human upper airways 

      Jordal, Maria Rolstad (Master thesis, 2016)
      In this master thesis, a patient specific computational fluid dynamics (CFD) \nomenclature{CFD}{Computational Fluid Dynamics} study has been done on the air flow in the human upper airways before and after surgical ...