Svend Tollak Munkejord

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Abstract. We consider systems of hyperbolic balance laws governing flows of an arbitrary number of components equipped with general equations of state. The components are assumed to be immiscible. We compare two such models; one in which thermal equilibrium is attained trough a relaxation procedure, and a fully relaxed model in which equal temperatures are(More)
A method for calculating the transport and depressurization of a two-phase multicomponent CO2 mixture is presented. The thermodynamical and transport properties for a CO2-CH4 mixture are calculated using the Soave-Redlich-Kwong equation of state (SRK). The fluid flow is described by a drift-flux model, which is solved using the multi-stage (MUSTA) centred(More)
<lb>The present thesis deals with the electrostatically assisted removal of water coproduced with<lb>crude oil in the form of stable emulsions during recovery and desalting operations. This process,<lb>referred to as electrocoalescence, exploits the ability of electric forces to promote attraction and<lb>merging of adjacent water droplets to increase their(More)
We consider a hyperbolic system of conservation laws describing multicomponent flows through a transport pipeline, with applications to CO2 transport and storage. We demonstrate that numerical dissipation easily leads to an underestimation of the amplitude of pressure pulses and the resulting pipe strain. We argue that recently developed high-resolution(More)
a r t i c l e i n f o a b s t r a c t The level-set method is a popular interface tracking method in two-phase flow simulations. An often-cited reason for using it is that the method naturally handles topological changes in the interface, e.g. merging drops, due to the implicit formulation. It is also said that the interface curvature and normal vectors are(More)
Abstract. We present a multi-stage centred scheme, of the kind proposed by Toro [Appl. Numer. Math. 56 (2006) 1464], for numerically resolving the simultaneous flow of two fluids through a transport pipeline. This model contains non-conservative terms in both the temporal and spatial derivatives, and an extension of the standard numerical framework for(More)
To leverage the last two decades’ transition in HighPerformance Computing (HPC) towards clusters of compute nodes bound together with fast interconnects, a modern scalable CFD code must be able to efficiently distribute work amongst several nodes using the Message Passing Interface (MPI). MPI can enable very large simulations running on very large clusters,(More)
We consider an isolated system of N immiscible fluids, each following a stiffened-gas equation of state. We consider the problem of calculating equilibrium states from the conserved fluid-mechanical properties, i.e., the partial densities and internal energies. We consider two cases; in each case mechanical equilibrium is assumed, but the fluids may or may(More)
This article addresses the use of the level-set method for capturing the interface between two fluids. One of the advantages of the level-set method is that the curvature and the normal vector of the interface can be readily calculated from the level-set function. However, in cases where the level-set method is used to capture topological changes, the(More)