14-17 May 2018
New Orleans
US/Central timezone

Uncertainty Quantification in DFN simulations with random geometry

17 May 2018, 12:15
15m
New Orleans

New Orleans

Poster MS 2.03: Challenges in flow and transport simulations in poro-fractured media: numerical methods and modeling Poster 4

Speaker

Dr Stefano Scialo (Politecnico di Torino)

Description

In the framework of underground flow simulations in fractured media, modeled by Discrete Fracture Networks (DFNs), we focus on the issue of the non-deterministic description of the network. For performing numerical simulations, fractures are indeed typically sampled from probabilistic distributions for both hydro-geological properties (fracture transmissivity) and geometrical features (orientation in the 3D space, position, size). An uncertainty quantification analysis is mandatory in these situations, for assessing the impact of stochastic parameters on some relevant quantities of interest (as, for example, the equivalent permeability). In the relevant case of stochastic description of the geometry of the network, the network connectivity may change among samples; as a consequence, the quantity of interest is likely to display a non-smooth behavior in the space of stochastic parameters. This situation is known to represent a challenging issue also for modern UQ techniques such as stochastic collocation strategies. We will address the issue of the application of effective, modern UQ techniques, as the Multilevel Monte Carlo Method (MLMC), for accurately computing suitable statistics of the quantity of interest at a moderate computational cost, considering both stochastic transmissivities and stochastic geometrical parameters.

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Primary authors

Stefano Berrone (Politecnico di Torino, Italy) Dr Sandra Pieraccini (Politecnico di Torino) Dr Stefano Scialo (Politecnico di Torino) Fabio Vicini (Politecnico di Torino)

Presentation Materials

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