Anna Varzina
KU Leuven, Department of Civil Engineering, Graduate Student
- University of Bergen, Department of Mathematics, Department Memberadd
- Carbonation of Concrete, Modelling of Concrete Transport Processes, Lattice Boltzmann method for fluid dynamics, R (Statistics), Python, Mathematics, Computational Mathematics, Numerical Modelling, Fluid flow in porous media, Heat Transfer, and 16 moreC++ Programming, Matlab, Advection and Diffusion, Carbonation, Concrete, Durability of Concrete, Lattice Boltzmann Equation, Lattice Boltzmann, Java Programming, OpenMP, Navier-Stokes Equations, Cement and Concrete Materials, Hydrated Cement Pastes, Cement, Scanning Electron Microscopy, and Effective Transport Propertiesedit
- PhD student.
PhD researcher at SCK-CEN: The Belgian Nuclear Research Centreedit
In this thesis we implement a numerical model of heat transfer in geothermal reservoirs. We use existing pressure and flow transport solvers as a starting point to investigate discretization techniques for a convection-conduction... more
In this thesis we implement a numerical model of heat transfer in geothermal reservoirs. We use existing pressure and flow transport solvers as a starting point to investigate discretization techniques for a convection-conduction temperature equation. Then we develop and analyse two dierent heat transfer solvers: explicit and implicit, that have dierent accuracy and onvergence requirements. For the convective part of the energy equation the upwind scheme is implemented and the two-point flux approximation is used to discretize the conductive term. Usually heat transfer simulations require large computational time due to high resolution on a fine scale. For efficient computation we investigate flow-based upgridding techniques, which were used before for fluid transport in porous media. However upgridding and upscaling can lead to less accurate results due to much loss of details in a discrete model. We compare solutions on different types ofgrids such as Cartesian grid and flow-based grids that are generated according to various indicators like permeability, velocity, time-of-flight and thermal conductivity. In this work we simulate an initial-boundary value problem with a heat flow through boundaries and try to investigate, which coarse grid leads to the most accurate results when solving the energy equation.