13 Result(s)
within
Ivan Georgiev
Computer Science
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Chapter and Conference Paper
Effluent Recirculation for Contaminant Removal in Constructed Wetlands Under Uncertainty: A Stochastic Numerical Approach Based on Monte Carlo Methodology
The problem of the alternative operational technique concerning effluent re-circulation in Horizontal Subsurface Flow Constructed Wetlands (HSF CW), and the possibility of this technique to remove efficiently ...
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Chapter and Conference Paper
On General Sum Approximations of Irrational Numbers
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Chapter and Conference Paper
Numerical Homogenization of Epoxy-Clay Composite Materials
The numerical homogenization of anisotropic linear elastic materials with strongly heterogeneous microstructure is studied. The developed algorithm is applied to the case of two-phase composite material: epoxy...
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Chapter and Conference Paper
Tall RC Buildings Environmentally Degradated and Strengthened by Cables Under Multiple Earthquakes: A Numerical Approach
A numerical investigation is presented for the seismic analysis of tall reinforced concrete (RC) Civil Engineering structures, which have been degradated due to extreme environmental actions and are strengthen...
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Chapter and Conference Paper
Supervised 2-Phase Segmentation of Porous Media with Known Porosity
Porous media segmentation is a nontrivial and often quite inaccurate process, due to the highly irregular structure of the segmentation phases and the huge interaction among them. In this paper we perform a 2-...
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Chapter and Conference Paper
A Computational Approach for Remediation Procedures in Horizontal Subsurface Flow Constructed Wetlands
A large-scale computational approach for groundwater flow and contaminant transport and removal in porous media is presented. Emphasis is given to remediation procedures in horizontal subsurface flow construct...
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Chapter and Conference Paper
Analysis of the CBS Constant for Quadratic Finite Elements
We study the behavior of the CBS constant as a quality measure for hierarchical two-level splittings of quadratic FEM stiffness matrices. The article is written in the spirit of [3] where the focus is on the r...
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Chapter and Conference Paper
On a Relative Computability Notion for Real Functions
For any class of total functions in the set of natural numbers, we define what it means for a real function to be conditionally computable with respect to this class. This notion extends a notion of relative u...
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Chapter and Conference Paper
Multilevel Preconditioning of Crouzeix-Raviart 3D Pure Displacement Elasticity Problems
In this study we demonstrate how some different techniques which were introduced and studied in previous works by the authors can be integrated and extended in the construction of efficient algebraic multileve...
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Chapter and Conference Paper
Multilevel Preconditioning of Rotated Trilinear Non-conforming Finite Element Problems
In this paper algebraic two-level and multilevel preconditioning algorithms for second order elliptic boundary value problems are constructed, where the discretization is done using Rannacher-Turek non-conform...
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Chapter and Conference Paper
Multilevel Preconditioning of 2D Rannacher-Turek FE Problems; Additive and Multiplicative Methods
In the present paper we concentrate on algebraic two-level and multilevel preconditioners for symmetric positive definite problems arising from discretization by Rannacher-Turek non-conforming rotated bilinear...
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Chapter and Conference Paper
Two-Level Preconditioning of Crouzeix-Raviart Anisotropic FEM Systems
The studied large-scale linear problems arise from Crouzeix-Raviart non-conforming FEM approximation of second order elliptic boundary value problems. A two-level preconditioner for the case of coefficient ani...
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Chapter and Conference Paper
MIC(0) Preconditioning of Rotated Trilinear FEM Elliptic Systems
New results on preconditioning of rotated multilinear non-conforming FEM elliptic systems in the case of mesh anisotropy are presented. The stiffness matrix is first approximated by a proper auxiliary M-matrix...
