Porous Media Group
MSc project

Advection Upscaling for Heat Transport in Fractured Geothermal Reservoir, 2018

Marija Ninic

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Advisors: Inga Berre, Eirik Keilegavlen

Short description of the project:

The main objective of this thesis is to give a numerical solution for the advection term of the heat transport equation in a fractured geothermal reservoir. To get a better insight into the fracture influence on the processes we will present all numerical results for domains with and without fracture fields. The fracture field is modeled explicitly using a discrete fracture model. Advection term of heat transport equation is discretized in space using the upwind scheme for time discretization we use implicit method: Euler's backward scheme. For advection term upscaling we use the known flux values that we get from the numerical solution of the pressure equation. To get a computationally more efficient transport solver we will use upscaling and upgridding. We will use flow-based indicators for upgridding fine-scale grid. In the case of fractured domain besides standard flow-based indicators: permeability, velocity, and time of flight we will use distance to the nearest fracture and the combination of distance and time of flight as indicators. At the end, we will compare results on different coarse grids with results on fine-scale grids.

Link to the thesis at Bora-UiB: https://bora.uib.no/bora-xmlui/handle/1956/18230