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- Giving to Math

Event Type:

Applied Mathematics and Computation Seminar

Date/Time:

Friday, June 26, 2015 - 12:00 to 13:00

Location:

GLK 115

Guest Speaker:

Institution:

Interdisciplinary Centre for Modeling, University of Warsaw

Abstract:

In the talk we discuss computational modeling applied to the study properties of mixtures of clays and sand which are used as sealing barriers of waste disposal sites. We apply the methodology of upscaling from pore- to core scale to study the isolating properties of soil mixtures in function of their compositions. Elements of the computational procedure are the following: (i) voxel-based pore scale geometry of a mixture is provided by the X-ray computed microtomography, (ii) numerical model which is based on Finite Volume discretization of the Navier-Stokes equations within the ANSYS/Fluent software, and (iii) upscaling to derive core scale parameters of samples, which is permeability in this case. Performing flow simulations based on realistic porescale geometries is a challenging task mainly due to the complex shapes of domains resulting in tremendous sizes of computational grids. We discuss strategies to reduce the complexity of computations, without too much deterioration in data resolution. Experimental measurements are used to provide realistic data describing geometry of mixtures, as well as to provide core scale parameters that may be compared with results of the computational procedure.