Blar i Bergen Open Research Archive på forfatter "Alyaev, Sergey"
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3-D induction log modelling with integral equation method and domain decomposition pre-conditioning
Saputera, Durra Handri; Jakobsen, Morten; van Dongen, Koen W. A.; Jahani, Nazanin; Eikrem, Kjersti Solberg; Alyaev, Sergey (Journal article; Peer reviewed, 2024)The deployment of electromagnetic (EM) induction tools while drilling is one of the standard routines for assisting the geosteering decision-making process. The conductivity distribution obtained through the inversion of ... -
Adaptive Multiscale Methods Based on A Posteriori Error Estimates
Alyaev, Sergey (Master thesis, 2010-06-01)We give an overview of different methods for solving highly heterogeneous elliptic problems with multiscale structure and no intuitive scale separation. We compare different finite element variational multiscale methods ... -
Analysis of Control Volume Heterogeneous Multiscale Methods for Single Phase Flow in Porous Media
Alyaev, Sergey; Keilegarden, Eirik; Nordbotten, Jan Martin (Peer reviewed; Journal article, 2014)The standard approximation for the flow-pressure relationship in porous media is Darcy's law that was originally derived for infiltration of water in fine homogeneous sands. Ever since there have been numerous attempts to ... -
Fractal structures in freezing brine
Alyaev, Sergey; Keilegavlen, Eirik; Nordbotten, Jan Martin; Pop, Iuliu Sorin (Peer reviewed; Journal article, 2017-09)The process of initial ice formation in brine is a highly complex problem. In this paper, we propose a mathematical model that captures the dynamics of nucleation and development of ice inclusions in brine. The primary ... -
Multiscale analysis of selected problems in fluid dynamics
Alyaev, Sergey (Doctoral thesis, 2017-02-03)The world around us is inherently multiscale. The variety of different models depending on the reference scale is particularly diverse in problems of fluid-solid systems. For those systems, the geometry, effective parameters ... -
Multiscale Simulation of Non-Darcy Flows
Alyaev, Sergey; Keilegarden, Eirik; Nordbotten, Jan Martin (Chapter; Peer reviewed, 2012-06)In this work we present control volume multiscale methods which address problems on the interaction between pore scale and Darcy scale. For the case when linear equations govern the ow on the pore scale our solution converges ... -
A numerical study of flow field and particle deposition in nasal channels with deviant geometry
Thune, Eveline Løvaas; Kosinski, Pawel Jan; Balakin, Boris; Alyaev, Sergey (Journal article; Peer reviewed, 2021)Deviant geometry of nasal channels results in significant changes to nasal aerodynamics that alter flow resistance, sensation, and the ability to filter aerosols. The invasive, operative modification of nasal geometry might ...