Gaute Linga

Gaute Linga
University of Oslo · Department of Physics

Doctor of Philosophy

About

22
Publications
4,782
Reads
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150
Citations
Additional affiliations
April 2019 - present
University of Oslo
Position
  • PostDoc Position
Description
  • PoreLab, The Njord Centre
September 2018 - March 2019
SINTEF
Position
  • Researcher
June 2015 - August 2018
University of Copenhagen
Position
  • PhD Student
Education
January 2013 - July 2013
Sorbonne Université
Field of study
  • Physics
August 2009 - June 2014
Norwegian University of Science and Technology
Field of study
  • Physics and Mathematics

Publications

Publications (22)
Article
Full-text available
Transport of solutes through channels with rough boundaries is abundant in natural and engineered settings. However, it is not known currently what the consequences of an abruptly alternating boundary are for the solute dispersion, in particular when advected by inertial fluid flow. To investigate this, we compute numerically the time-asymptotic lo...
Preprint
Transport in multiphase flow through porous media plays a central role in many biological, geological, and engineered systems. Whereas solute and particle dispersion has been extensively studied in single-phase flow, less is known about dispersion in multiple flowing fluid phases in porous media. Here, we use numerical simulations of transport in i...
Preprint
Using 3D direct numerical simulations of the Navier--Stokes equations, we study the effect of wall roughness on the onset of turbulence in channel flow. The dependence of the friction factor on the Reynolds number, $\mathrm{Re}$, is found to follow a generalized Forchheimer law, which interpolates between the laminar and inertial asymptotes. The tr...
Article
Self-assembly of ordered nanometer-scale patterns is interesting in itself, but its practical value depends on the ability to predict and control pattern formation. In this paper we demonstrate theoretically and numerically that engineering of extrinsic as well as intrinsic substrate geometry may provide such a controllable ordering mechanism for b...
Article
Full-text available
We discuss how to introduce local time-step refinements in a sequential implicit method for multiphase flow in porous media. Our approach relies heavily on causality-based optimal ordering, which implies that cells can be ordered according to total fluxes after the pressure field has been computed, leaving the transport problem as a sequence of ord...
Article
Transport of electrolytic solutions under influence of electric fields occurs in phenomena ranging from biology to geophysics. Here, we present a continuum model for single-phase electrohydrodynamic flow, which can be derived from fundamental thermodynamic principles. This results in a generalized Navier–Stokes–Poisson–Nernst–Planck system, where f...
Preprint
Full-text available
Self-assembly of ordered nanometer-scale patterns is interesting in itself, but its practical value depends on the ability to predict and control pattern formation. In this paper we demonstrate theoretically and numerically that engineering of extrinsic as well as intrinsic substrate geometry may provide such a controllable ordering mechanism for b...
Article
Full-text available
Bernaise (Binary Electrohydrodynamic Solver) is a flexible high-level finite element solver of two-phase electrohydrodynamic flow in complex geometries. Two-phase flow with electrolytes is relevant across a broad range of systems and scales, from "lab-on-a-chip" devices for medical diagnostics to enhanced oil recovery at the reservoir scale. For th...
Article
Full-text available
We review and extend a hierarchy of relaxation models for two-phase flow. The models are derived from the non-equilibrium Baer–Nunziato model, which is endowed with relaxation source terms to drive it towards equilibrium. The source terms cause transfer of volume, heat, mass and momentum due to differences between the phases in pressure, temperatur...
Article
The wetting properties of immiscible two-phase systems are crucial in applications ranging from laboratory-on-a-chip devices to field-scale oil recovery. It has long been known that effective wetting properties can be altered by the application of an electric field; a phenomenon coined as electrowetting. Here, we consider theoretically and numerica...
Preprint
Full-text available
Bernaise (Binary ElectRohydrodyNAmIc SolvEr) is a flexible high-level finite element solver of two-phase electrohydrodynamic flow in complex geometries. Two-phase flow with electrolytes is relevant across a broad range of systems and scales, from 'lab-on-a-chip' devices for medical diagnostics to enhanced oil recovery at the reservoir scale. For th...
Preprint
Full-text available
Transport of electrolytic solutions under influence of electric fields occurs in phenomena ranging from biology to geophysics. Here, we present a continuum model for single-phase electrohydrodynamic flow, which can be derived from fundamental thermodynamic principles. This results in a generalized Navier--Stokes--Poisson--Nernst--Planck system, whe...
Preprint
The wetting properties of immiscible two-phase systems are crucial in a wide range of applications, from lab-on-a-chip devices to field-scale oil recovery. It has long been known that effective wetting properties can be altered by the application of an electric field; a phenomenon coined as electrowetting. Here, we consider theoretically and numeri...
Article
Full-text available
In low-permeability rock, fluid and mineral transport occur in pores and fracture apertures at the scale of micrometers and below. At this scale, the presence of surface charge, and a resultant electrical double layer, may considerably alter transport properties. However, due to the inherent non-linearity of the governing equations, numerical and t...
Article
Full-text available
Equations of state (EoS) are essential in the modeling of a wide range of industrial and natural processes. Desired qualities of EoS are accuracy, consistency, computational speed, robustness and predictive ability outside of the domain where they have been fitted. In this work, we review present challenges associated with established models, and g...
Article
Full-text available
In a porous rock, the spatial distribution of the pore space induces a strong heterogeneity in fluid flow rates and in the stress distribution in the rock mass. If the rock microstructure evolves through time, for example by dissolution, fluid flow and stress will evolve accordingly. Here, we consider a core sample of porous limestone that has unde...
Article
Full-text available
Flow of CO2 in wells is associated with substantial variations in thermophysical properties downhole, due to the coupled transient processes involved: complex flow patterns, density changes, phase transitions, and heat transfer to and from surroundings. Large temperature variations can lead to thermal stresses and subsequent loss of well integrity,...
Article
Full-text available
The creep deformation and eventual breaking of polymeric samples under a constant tensile load F is investigated by molecular dynamics based on a particle representation of the fiber bundle model. The results of the virtual testing of fibrous samples consisting of 40000 particles arranged on Nc=400 chains reproduce characteristic stages seen in the...
Article
We consider nozzle flow models for two-phase flow with phase transfer. Such models are based on energy considerations applied to the frozen and equilibrium limits of the underlying relaxation models. In this paper, we provide an explicit link between the mass flow rate predicted by these models and the classical subcharacteristic condition of Chen,...
Article
Full-text available
We consider a hierarchy of models for two-phase flow. The models are derived from the full non-equilibrium Baer–Nunziato model endowed with relaxation source terms to drive it towards equilibrium. These source terms cause transfer of volume, heat, mass and momentum due to differences between the phases in pressure, temperature, chemical potential a...
Thesis
We introduce a particle-based model of an idealized polymeric bundle, whose properties are investigated by means of molecular dynamics simulations. We analyse in particular the effect of applying a tensile stress, stretching and eventually breaking the bundle. The simulation results show that, despite its simplicity, the model captures characteris...

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Projects

Projects (3)
Project
Efficient simulation of electrohydrodynamic flows in complex geometries.
Project
The laminar-turbulent transition in wall bounded shear flows exhibits a complex spatio-temporal scenario. Despite many efforts, a detailed understanding of the interaction among the scales excited at the onset of turbulence remains elusive. We investigate the stability of localized turbulent patches (puffs) under noisy perturbations induced by wall irregular geometry. We aim at assessing the effects of both amplitude and spatial distributions of wall roughness on the statistical properties of puffs splitting-decaying processes.