Trial lecture
“Is there a good compromise between energy consumption and efficiency of HPC applications?”
Time and place: September 19, 2023 11:15 AM, Simula Research Laboratory, Hans Petter Langtangen Lecture Hall (Kristian Augusts Gate 23)
Main research findings
Reservoir simulation is an important tool in the oil and gas industry, using mathematical models to predict the flow of fluids in sub-surface petroleum reservoirs. Oil and gas companies use reservoir simulations to make economic decisions and to develop and manage the production of new fields. The demand for accuracy and the typical size of reservoirs introduces the need for a lot of computing power. To efficiently utilize computer resources, the simulations must be divided into multiple small tasks that can be run in parallel. Reservoir simulation-specific aspects, such as complex geology and well modeling, complicate the parallelization of reservoir simulations. In this thesis, we considered domain decomposition strategies for parallel reservoir simulations and their impact on performance. A new graph partitioning technique that incorporates reservoir heterogeneity while maintaining low parallel overhead is presented. We studied efficient parallelization of linear solvers for reservoir simulation and the impact of the preconditioning strategy on the overall performance. Understanding the underlying hardware architecture of modern computers helps achieve resource efficient simulations. We introduce a new modeling methodology for estimating parallel overhead on computing platforms with heterogeneous inter-process interconnects. The research of the thesis contributed to the development of an open-source reservoir simulator.
Adjudication committee:
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Professor Bernd Flemisch, Department of Hydromechanics and Modelling of Hydrosystems, University of Stuttgart, Germany
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Research Scientist Emmanuelle Saillard, Inria Bordeaux, France
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Professor Özgu Alay, Department of Informatics, University of Oslo, Norway
Supervisors
- Professor Xing Cai, Simula Research Laboratory
- Specialist in reservoir technology Alf Birger Rustad, Equinor
- Professor Tor Skeie, Department of Informatics, University of Oslo
- Associate Professor Ernst Gunnar Gran, Department of Information Security and Communication Technology, Norwegian University of Science and Technology
Chair of defence:
Associate Professor Ingrid Chieh Yu
Contact information at Department: Pernille Adine Nordby