Blar i Vitenskapelige publikasjoner (TN-IPT) på forfatter "Evje, Steinar"
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A compressible two-phase model with pressure-dependent well-reservoir interaction
Evje, Steinar (Journal article; Peer reviewed, 2013)This paper deals with a two-phase compressible gas-liquid model relevant for modeling of gas-kick flow scenarios in oil wells. To make the model more realistic we include a natural pressure-dependent well-formation ... -
An exponential time-differencing method for monotonic relaxation systems
Aursand, Peder; Evje, Steinar; Flåtten, Tore; Teigen, Knut Erik; Munkejord, Svend Tollak (Journal article; Peer reviewed, 2014)We present first and second-order accurate exponential time differencing methods for a special class of stiff ODEs, denoted as monotonic relaxation ODEs. Some desirable accuracy and robustness properties of our methods are ... -
Asymptotic behavior of a compressible two-phase model with well–formation interaction.
Evje, Steinar; Friis, Helmer Andre (Journal article; Peer reviewed, 2013-02)In this work we consider a compressible gas–liquid model with a well–reservoir interaction term that is relevant for coupled wellbore-reservoir flow systems involved in e.g. drilling operations. Main focus is on deriving ... -
Genuine two-phase flow dynamics with a free interface separating gas-liquid mixture from gas
Evje, Steinar (Journal article; Peer reviewed, 2013)This paper deals with a two-phase compressible gas-liquid model relevant for modeling of gas-kick flow scenarios in oil wells. To make the model more realistic we include a natural pressure-dependent well-formation ... -
Global weak solutions for a compressible gas-liquid model with well-formation interaction
Evje, Steinar (Journal article; Peer reviewed, 2011-10)Abstract. The objective of this work is to explore a compressible gas-liquid model designed for modeling of well °ow processes. We build into the model well-reservoir interaction by allowing °ow of gas between well and ... -
Global weak solutions for a gas liquid model with external forces and general pressure law
Evje, Steinar; Friis, Helmer André (Journal article; Peer reviewed, 2011)In this work we show existence of global weak solutions for a two-phase gas-liquid model where the gas phase is represented by a general isothermal pressure law, whereas the liquid is assumed to be incompressible. To make ... -
Numerical treatment of two-phase flow in capillary heterogeneous porous media by finite-volume approximations
Evje, Steinar; Friis, Helmer André (Journal article; Peer reviewed, 2012)This paper examines two-phase flow in porous media with heterogeneous capillary pressure functions. This problem has received very little attention in the literature, and constitutes a challenge for numerical discretization, ... -
Weak solutions for a gas liquid model relevant for describing gas-kick in oil wells
Evje, Steinar (Journal article; Peer reviewed, 2011)The purpose of this paper is to establish a local in time existence result for a compressible gas-liquid model. The model is a drift-flux model which is composed of two continuity equations and one mixture momentum equation ...