title: Two-Phase Compositional Flow Simulation  with Persistent Variables  
creator: Cuveland, Rebecca de
subject: ddc-510
subject: 510 Mathematics
description: Carbon capture and storage (CSS) is a recently discussed new technology, aimed at allow-  ing an ongoing use of fossil fuels while preventing the produced CO2 from being released  into the atmosphere. A suitable mathematical model to simulate this process is com-  positional multiphase flow with equilibrium phase exchange. It is able to represent the  important process of solubility trapping. One of the big problems arising in two-phase  two-component flow simulations is the disappearance of the nonwetting phase, where the  saturation cannot be used as independent variable.  In this thesis, a persistent variable formulation is presented, which has the important  advantage that only one set of primary variables can be used for the biphasic as well as  the monophasic case. Using a modified Newton solver, also developed in the course of this  work, the convergence at the single-phase/two-phase interface can be greatly improved.  The persistent variable formulation is implemented in the DUNE simulation framework  with capillary pressure and nonwetting phase pressure as primary variables. The presented  method is verified by numerical test simulations of CO2 injection in saline aquifers. A  fine grid resolution for these large-scale simulations can only be achieved by the use of  heavy parallelization. The numerical results for the recent MoMas benchmark agree with  the output of other groups. For several test cases, grid convergence and scalability are  analyzed numerically. The method scales well and converges with the optimal order of  convergence.  
date: 2015
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/18629/1/thesis_final.pdf
identifier: DOI:10.11588/heidok.00018629
identifier: urn:nbn:de:bsz:16-heidok-186294
identifier:   Cuveland, Rebecca de  (2015) Two-Phase Compositional Flow Simulation with Persistent Variables.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/18629/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng