LSSC’23 SCIENTIFIC PROGRAM

June 05, Monday

09:30 – 12:00 Plenary Session

Plenary Hall

09:30 - 90:45 Opening

Chairperson: L. Zikatanov

09:45 - 10:30 G. Pichot, Flow Simulations in Large-Scale Fractured Media

10:30 - 11:15 D. Boffi, Reduced Order Methods for Parametric Eigenvalue Problems

11:15 - 12:00 B. Alexandrov, SmartTensors: A New AI Platform for Big-Data Analytics and Feature Extractions

Lunch Break

13:35 - 15:40 Parallel Sessions

Lecture Hall A

Special Session: Fractures and Mixed Dimensional Modeling: Discretizations, Solvers, and Methodology

Chairperson: L. Formaggia

14:00 – 14:25 Z. Dong, A. Ern, G. Pichot, A Posteriori Error Estimates for Hybrid High-Order Methods on Polygonal and Polyhedral Meshes

14:25 – 14:50

14:50 – 15:15 A. Fumagalli, W.M. Boon, A Machine Learning Technique for the Darcy Problem in a Fractured Porous Media that Ensure Local Mass Conservation

15:15 – 15:40 A. Budiša, X. Hu, M. Kuchta, K.-A. Mardal, L.T. Zikatanov, Multilevel Methods for Nearly-Singular Problems in Mixed Dimensions

Lecture Hall B

Special Session: Large-Scale Models: Numerical Methods, Parallel Computations and Applications

Chairperson: K. Georgiev

14:00 – 14:25 I. Farago, Nonstandard Finite Difference Method and its Application to Epidemic Propagation

14:25 – 14:50 S. Korotov, M. Krizek, Mathematical and Computational Modeling of a Nonlinear Heat Conduction

14:50 – 15:15 M. Frost, A. Moskovka, J. Valdman, Minimization of energy functionals via FEM: implementation of hp-FEM

15:15 – 15:40 Venelin Todorov, Slavi Georgiev, Ivan Dimov, Rayna Georgieva, and Tzvetan Ostromsky, Improved Stochastic Lattice Methods for Large-scale Air Pollution Model

Lecture Hall C

Special Session: Applications of Metaheuristics to Large-Scale Problems

Chairperson: V. Traneva

14:00 – 14:25 S.B. Hengeveld, A. Mucherino, Variable Neighborhood Search in Hamming Space

14:25 – 14:50 S. Fidanova, K. Atanassov, Ant Algorithm with Local Search Procedure for Multiple Knapsack Problem

14:50 – 15:15 A. Badica, C. Badica, I. Buligiu, L. I. Ciora, M. Ganzha, M. Paprzycki, Solving the Mountain Car Problem Using Genetic Algorithms

15:15 – 15:40 V. Todorov, S. Georgiev, B. Chakarov, S. Hadziivanov, Optimization of the Standard Lattice Sequence for Multidimensional Integrals Regarding Large-Scale Finance Problems

Coffee Break

16:10 - 18:15 Parallel Sessions

Lecture Hall A

Special Session: Fractures and Mixed Dimensional Modeling: Discretizations, Solvers, and Methodology

Chairperson: G. Pichot

16:10 – 16:35 P.F. Antonietti, S. Bonetti, M. Botti, I. Mazzieri, Discontinuos Galerkin Approximation of the Fully-Coupled Thermo-Poroelastic Problem

16:35 – 17:00 L. Beaude, F. Chouly, M. Laaziri, R. Masson, Nitsche’s and Mixed Formulations of Frictionless Contact-Mechanics for Mixed-Dimensional Poromechanical Models

17:00 – 17:25 A. Paluszny, C. Saceanu, R.W. Zimmerman, Numerical Modelling of the Nucleation and Growth of Multiple Three-Dimensional Dense Fracture Sets

17:25 – 17:50 L. Formaggia, A. Fumagalli, A. Scotti, Simulation of Reactive Flow in Fractured Porous Media with Hybrid Dimensional Models and Polytopal Grids

Lecture Hall B

Special Session: Machine Learning and Model Order Reduction for Large-Scale Predictive Simulation

Chairperson: O. Iliev

16:10 – 16:35 T. Keil, M. Ohlberger, S. Rave, F. Schindler, Adaptive Localized Reduced Basis Methods for Large Scale Parameterized Systems

16:35 – 17:00 T. Wenzel, B. Haasdonk, H. Kleikamp, M. Ohlberger, F. Schindler, Application of Deep Kernel Models for Certified and Adaptive RB-ML-ROM Surrogate Modeling

17:00 – 17:25 D. Fokina, V. Grigoriev, O. Iliev, I. Oseledets, Machine Learning Algorithms for Parameter Identification of Reactive Flow in Porous Media

17:25 – 17:50 R. Jendersie, N. Margenberg, C. Lessig, T. Richter, S. Yildil, T. Keil, A Flexible Neural Network Multigrid Solver for the Navier-Stokes Equations

Lecture Hall C

Special Session: HPC and HPDA: Algorithms and Applications

Chairperson: E. Atanassov

16:10 – 16:35 J. Cervenka, R. Kosik, F. Ribeiro, Parallel Solution of the Schrödinger-Poisson Equation on GPUs

16:35 – 17:00 A. Lalayan, H. Astsatryan, G. Giuliani, Earth Observation Data Processing Simulator Based on the CloudSim

17:00 – 17:25 S.-M. Gurova, E. Atanassov, A. Karaivanova, A Resolvent Quasi-Monte Carlo Method for Estimating the Minimum Eigenvalues Using the Error Balancing

17:25 – 17:50 D.T. Dimov, T. Gurov, S. Ivanovska, S. Yordanov, Anastylosis of Frescos --a Web Service in an HPC Environment

17:50 – 18:15 P. Koprinkova-Hristova, N. Kasabov, S. Nedelcheva, S. Ivanovska, S. Yordanov, D. Penkov, Grid Search Optimization of Novel SNN-ESN Classifier on a Supercomputer Platform

RECEPTION

June 06, Tuesday

09:00 - 10:15 Parallel Sessions

Lecture Hall A

Special Session: Modeling, Discretization and Solvers for Interface-Coupled Multiphysics Problems

Chairperson: M. Kuchta

09:00 – 09:25 A.J. Ellingsrud, R. Masri, M. Kuchta, Cell-based Modelling and Simulation of Electrical and Chemical Interplay in Excitable Tissue

09:25 – 09:50 E. Valseth, C. Dawson, C. Wichitrnithed, E. Kubatko, Y. Kang, M. Hudson, Discontinuous Galerkin Methods for Coupled and Compound Flood Simulations

09:50 – 10:15 R. Masri, M. Zeinhofer, M. Kuchta, M.E. Rognes, The Modeling Error in Reduced 3D-1D Time Dependent Solute Transport Models

Lecture Hall B

Special Session: Applications of Metaheuristics to Large-Scale Problems

Chairperson: S. Fidanova

09:00 – 09:25 V. Traneva, P. Petrov, S. Tranev, Circular Intuitionistic Fuzzy Knapsack Problem

09:25 – 09:50 V. Todorov, S. Georgiev, S. Apostolv, I. Dimov, An Improved Algorithm for Fredholm Integral Equations

09:50 – 10:15 V. Todorov, S. Georgiev, S. Apostolov, I. Dimov, R. Georgieva, Y. Dimitrov, An Optimized Version of ,,Walk on Equations” Algorithm for Large-Scale Problems

Lecture Hall C

Chairperson: I. Farago

Special Session: Large-Scale Models: Numerical Methods, Parallel Computations and Applications

09:00 – 09:25 T.T. Marinov, R.S. Marinova, Two Approaches for Identifying COVID-19 Parameters Illustrated with Data for Bulgaria

09:25 – 09:50 N. Ilieva, P. Petkov, E. Lilkova, L. Litov, In Silico Perspective on the Possible Biological Role of the Non-cationic Peptides in Biologically Active Substances

09:50 – 10:15 E. Lilkova, P. Petkov, M. Rangelov, N. Todorova, L. Litov, N. Ilieva, Unravelling the Mechanism of Action of the SARS-CoV-2 ORF6 Protein Using Computer Simulations

Coffee Break

10:45 - 12:00 Parallel Sessions

Lecture Hall A

Special Session: Modeling, Discretization and Solvers for Interface-Coupled Multiphysics Problems

Chairperson: L. Zikatanov

10:45 – 11:10 N.A. Barnafi, Accelerated Quasi-Newton Schemes for Multiphysics Problems

11:10 – 11:35 J. Sistek, Scalable Multilevel Domain Decomposition Solver for Immersed Boundary Finite Element Method

11:35 – 12:00 R. Winther, What about p?

Lecture Hall B

Special Session: Tensor Methods for Big Data Analytics and Low-Rank Approximations of PDEs Solutions

Chairperson: B. Alexandrov

10:45 – 11:10 G. Manzini, D.P. Truong, R. Vuchkov, B. Alexandrov, The Tensor-Train Mimetic Finite Difference Method For Three-Dimensional Maxwell's Wave Propagation Equations

11:10 – 11:35 M. Martinelli, G. Manzini, A Functional Tensor Train Library in RUST for Numerical Integration and Resolution of Partial Differential Equations

11:35 – 12:00 H. Djidjev, Logical Qubit Implementation for Quantum Annealing

Lecture Hall C

Special Session: Large-Scale Models: Numerical Methods, Parallel Computations and Applications

Chairperson: I. Farago

10:45 – 11:10 Zofia Wrona, Marcin Paprzycki, Maria Ganzha, Stanisław Krzyżanowski, Scalability of Extended Green Cloud Simulator

11:10 – 11:35 K. Georgiev, Z. Zlatev, Development of New High Performance Computer Architectures and Improvements in Danish Eulerian Model for Long Range Transport of Air Pollutants

11:35 – 12:00 M. Nazarov, Viscous regularization of the MHD equations

Lunch Break

14:00 - 15:40 Parallel Sessions

Lecture Hall A

Special Session: Large-Scale Models: Numerical Methods, Parallel Computations and Applications

Chairperson: N. Ilieva

14:00 – 14:25 H. Chervenkov, V. Spiridonov, Clouds Formed by Thermals Arising and Evolving under the Influence of the Coriolis Force

14:25 – 14:50 G. Gadzhev, I. Georgieva, K. Ganev, V. Ivanov, N. Miloshev, Influence of the Grid Resolutions on the Computer Simulated Transport and Transformation Atmospheric Composition Processes over the Territory of Bulgaria

14:50 – 15:15 I. Georgieva, G. Gadzhev, K. Ganev, V. Ivanov, N. Miloshev, Evaluation of the Effects of the National Emission Reduction Strategies for years 2020-2029 and after 2030 on the AQI on the Theritory of Bulgaria

15:15 – 15:40 T. Ostromsky, V. Todorov, K. Georgiev, I. Dimov, Z. Zlatev, Optimization and Sensitivity Analysis of a Parallel Code for Air Pollution Modelling

Lecture Hall B

Special Session: Variational Analysis and Optimal Control

Chairperson: A. Seidl

14:00 – 14:25 V.M. Veliov, Strong Subregularity of Variational Inequalities: General Results and Case Studies

14:25 – 14:50 A. Daniilidis, M. Quincampoix, Extending Rademacher Theorem to Set-Valued Maps

14:50 – 15:15 M. Bivas, A, Daniilidis, M. Quincampoix, Characterization of Filippov Representable Maps and Clarke Subdifferentials

15:15 – 15:40 A. Marigonda, Multiagent Systems, Nonlinear Superposition and Random Lift

Lecture Hall C

Special Session: Fractional Differential Problems: Theoretical Aspects, Algorithms and Applications

Chairperson: S. Harizanov

14:00 – 14:25 J. Guo, M. Lopez-Fernandez, Generalized Convolution Quadrature for the Fractional Integral and Fractional Diffusion Equations

14:25 – 14:50 E. Sousa, Fractional Diffusion Problems with Reflecting Boundaries

14:50 – 15:15 M. Kuchta, Domain Decomposition Solvers for Problems with Strong Fractional Interface Perturbations

15:15 – 15:40 R. Bulle, O. Barrera, S.P.A. Bordas, F. Chouly, J.S. Hale, An a Posteriori Error Estimator for the Spectral Fractional Power of the Laplacian

Coffee Break

16:10 - 18:15 Parallel Sessions

Lecture Hall A

Special Session: Modeling, Discretization and Solvers for Interface-Coupled Multiphysics Problems

Chairperson: K.-A. Mardal

16:10 – 16:35 I. Gjerde, R. Masri, A. Poulain, M. Rognes, B. Wohlmuth, Coupled 1D-3D Network Models for Pulsatile Perivascular Fluid Flow

16:35 – 17:00 J. Sogn, K.-A. Mardal, M. Kuchta, 3D-1D Preconditioners for Inverse Problems Using Isogeometric Analysis

17:00 – 17:25 T. Koch, 1D-3D Mixed-Dimensional Models of Tubular Networks Embedded In Porous Media

Lecture Hall B

Contributed Talks

Chairperson: T. Ostromsky

16:10 – 16:35 A. Andreev, M. Racheva, On Some Quadratic Eigenvalue Problems

16:35 – 17:00 R. Kosik, J. Cervenka, D. Waldhör, F. Ribeiro, H. Kosina, Exploring the Global Solution Space of a Simple Schrödinger-Poisson Problem

17:00 – 17:25 M.N. Koleva, L.G. Vulkov, Numerical Determination of Time-dependent Volatility for American Option when the Optimal Exercise Boundary is Known

Lecture Hall C

Special Session: Fractional Differential Problems: Theoretical Aspects, Algorithms and Applications

Chairperson: L. Aceto

16:10 – 16:35 M.N. Koleva, L.G. Vulkov, Numerical Determination of Source from Point Observation in a Time-Fractional Boundary-Value Problem on Disjoint Intervals

16:35 – 17:00 A. Atanasov, S.G. Georgiev, L.G. Vulkov, Coefficient Restoration in a Fractional Honeybee Population Dynamics and Food Interaction Model

17:00 – 17:25 D. Slavchev, S. Margenov, Study of Sparsification Schemes for the FEM Stiffness Matrix of Fractional Diffusion Problems

17:25 – 17:50 S. Harizanov, Solving Large-Scale Fractional Linear Systems of Sparse SPD Matrices with Small Spectrum

June 07, Wednesday

09:30 – 11:45 Plenary Session

Plenary Hall

Chairperson: R. Lazarov

09:30 - 10:15 S. Caucao, T. Li, I. Yotov, Mixed Finite Element Methods for Fluid-Poroelastic Structure Interaction

10:15 - 11:00 M. Neytcheva, The Power of Block Preconditioners

10:00 - 11:45 J. Schöberl, Flexible Multigrid Methods within the Finite Element Library NGSolve

Lunch Break

EXCURSION

June 08, Thursday

09:00 - 10:15 Parallel Sessions

Lecture Hall A

Special Session: Stochastic Optimal Control and Numerical Methods in Economics and Finance

Chairperson: M. Leocata

09:00 – 09:25 S. Federico, D. Ghilli, F. Gozzi, Mean Field Games in Infinite Dimension

09:25 – 09:50 D. Tonon, Mean Field Games Planning Problems with General Initial and Final Measures

09:50 – 10:15 F. Camilli, A. Festa, A system of of Hamilton-Jacobi equations characterizing geodesic centroidal tessellations

Lecture Hall B

Special Session: Fractional Differential Problems: Theoretical Aspects, Algorithms and Applications

Chairperson: L. Aceto

09:00 – 09:25 N. Kosturski, S. Margenov, Y. Vutov, Non-overlapping DD-BURA Preconditioning for 3D Elliptic Problems

09:25 – 09:50 L. Aceto, M. Mazza, A Rational Preconditioner for Multi-dimensional Riesz Fractional Reaction-diffusion Equations

Lecture Hall C

Special Session: Machine Learning and Model Order Reduction for Large-Scale Predictive Simulation

Chairperson: T. Keil

09:00 – 09:25 R. Herkert, P. Buchfink, B. Haasdonk, J. Rettberg, J. Fehr, Randomized Symplectic Model Order Reduction for Hamiltonian Systems

09:25 – 09:50 J. Ender, R. Lacerda de Orio, V. Sverdlov, Towards Efficient SOT-assisted STT-MRAM Cell Switching using Reinforcement Learning

09:50 – 10:15 S. Yildiz, P. Goyal, T. Bendokat, P. Benner, Learning Quadratic Hamiltonian Systems from the Data

Coffee Break

10:45 - 12:25 Parallel Sessions

Lecture Hall A

Special Session: Preconditioning and Multilevel Methods, In memory of O. Axelsson

Chairperson: P. Vassilevski

10:45 – 11:10 B. Duan, R. Lazarov, J. Pasciak, Solving Equations with Fractional Powers of Elliptic Operators by Padè Approximation

11:10 – 11:35 U. Langer, R. Löscher, O. Steinbach, H. Yang, Robust Preconditioned Iterative Solvers for Discretized Reduced Optimality Systems

11:35 – 12:00 S. Harizanov, I. Lirkov, S. Margenov, Rational Approximations in Robust Preconditioning of Coupled Problems

12:00 – 12:25 Z.-Z. Bai, A Review on Algorithmic Extensions and Convergence Theory for Randomized Kaczmarz Iteration Methods

Lecture Hall B

Special Session: Fractional Differential Problems: Theoretical Aspects, Algorithms and Applications

Chairperson: S. Harizanov

10:45 – 11:10 J.R. Cardoso, Computing the Mittag-Leffler Function of a Matrix Argument

11:10 – 11:35 D. Prodanov, The Wright Function – Hypergeometric Representation and Numerical Approximation

11:35 – 12:00 L. Aceto, F. Durastante, Efficient Computation of the Wright Function and Its Applications to Fractional Diffusion-Wave Equations

12:00 – 12:25 H. Bansu, S. Margenov, Parametric Analysis of Space-Time Fractional Pennes Bioheat Model Using a Collocation Method Based on Radial Basis Functions and Chebyshev Polynomials

Lecture Hall C

Special Session: Tensor Methods for Big Data Analytics and Low-Rank Approximations of PDEs Solutions

Chairperson: G. Manzini

10:45 – 11:10 M. Béreš, Efficient Solution of Stochastic Galerkin Matrix Equations via Reduced Basis and Tensor Train Approximation

11:10 – 11:35 M. Oster, Tensor Train Approximation and Monte Carlo Methods in High Dimensional Optimal Control Problems

Lunch Break

14:00 - 15:40 Parallel Sessions

Lecture Hall A

Special Session: Preconditioning and Multilevel Methods, In memory of O. Axelsson

Chairperson: M. Neytcheva

14:00 – 14:25 J. Karàtson, Some Applications of Compact-Equivalent Operator Preconditioning

14:25 – 14:50 M. Bernaschi, M. Carrozzo, A. Celestini, P. D'Ambra, L. Pichetti, F. Vella, Preconditioned s-step Conjugate Gradient for Multi-GPU Systems

14:50 – 15:15 T. Abe, A.T. Chronopoulos, The Generalized Residual Cutting Method and its Convergence Characteristics

15:15 – 15:40 M. Mazza, R. Sormani, S. Serra-Capizzano, Algebra Preconditionings for 2D Riesz Distributed-Order Space-Fractional Diffusion Equations on Convex Domains

Lecture Hall B

Special Session: Variational Analysis and Optimal Control

Chairperson: V. Veliov

14:00 – 14:25 N. Ribarska, M. Krastanov, Subtransversality and Measures of Noncompactness

14:25 – 14:50 N. Ribarska, M, Tasheva, Transversality and Strong Tangetial Transversality

14:50 – 15:15 S. Apostolov, M. Krastanov, N. Ribarska, The Clarke Tangent Cone to the Epigraph of an Integral Functional

15:15 – 15:40 T. Manev, S. Troyanski, On Locally Uniformly Rotund Renorming of the Space of Continuous Functions on a Compact Admitting a Fully Closed Projection

Lecture Hall C

Special Session: HPC and HPDA: Algorithms and Applications

Chairperson: V. Alexandrov

14:00 – 14:25 S. Kucherenko, O. Zaccheus, N. Shah, Breaking the Curse of Dimensionality with Active Subspaces

14:25 – 14:50 A. Lebedev, E. Sahin, V. Alexandrov, On Scalability of Hybrid Monte Carlo Methods on Advanced Architectures and their Sensitivity to True Random Numbers

14:50 – 15:15 E. Sahin, S. Mensa, P. Pati, A. F. Rodriguez, J. L. Robertus, M. Gabrani, Integrating Quantum Machine Learning with Computational Histopathology for Cancer Slides Classification

15:15 – 15:40 S. Topalova, S. Zhelezova, Parallelisms of PG(3,4) with a Great Number of Regular Spreads

Coffee Break

16:10 - 18:15 Parallel Sessions

Lecture Hall A

Special Session: Preconditioning and Multilevel Methods, In memory of O. Axelsson

Chairperson: R. Lazarov

16:10 – 16:35 H. Lu, C. Blom, J. Vink, Compensated Multifold Preconditioners

16:35 – 17:00 H.R. Fairbanks, P. Vassilevski, Matrix-based Redistribution for Improved Coarse Level Scaling in Multilevel Markov Chain Monte Carlo

17:00 – 17:25 S. Sysala, Continuation and Adaptive Newton Methods with Applications to Plasticity and Geotechnical Stability

17:25 – 17:50 T. Luber, S. Sysala, Numerical Comparison of Block Preconditioners for Poroelasticity

17:50 – 18:15 V. Pimanov, O. Iliev, E. Muravleva, I. Oseledets, On the Efficient Preconditioning of the Stokes Equations in Tight Geometries

Lecture Hall B

Special Session: Variational Analysis and Optimal Control

Chairperson: M. Quincampoix

16:10 – 16:35 A. Seidl, R.F. Hartl, P.M. Kort, Indifference Thresholds in a Bi-Objective Capital Accumulation Problem

16:35 – 17:00 G. Angelov, R. Kovacevic, N.I. Stilianakis, V.M. Veliov, Vaccination and Waning Immunity Model for Covid-19

17:00 – 17:25 M. Krastanov, B.K. Stefanov, A Sufficient Condition for the Existence of a Nash Equilibrium

17:25 – 17:50 M. Krastanov, M.N.Nikolova, High-Order Small-Time Local Controllability

17:50 – 18:15 M. Krastanov, N. Ribarska, On the Euler Equation

Lecture Hall C

Special Session: Stochastic Optimal Control and Numerical Methods in Economics and Finance

Chairperson: D. Ghilli & G. Livieri

16:10 – 16:35 A. Porretta, M. Ricciardi, Stationary Mean Field Games with State Constraints

16:35 – 17:00 G. Mazanti, L. Pfeiffer, S. S. Arjmand, A Variational Mean Field Game with Free Final Time and Control Interaction

17:25 – 17:50 S.G. Georgiev, L. G. Vulkov, Computation of the Unknown Time-Dependent Volatility of American Options from Integral Observations

CONFERENCE DINNER

June 09, Friday

09:30 - 11:10 Parallel Sessions

Lecture Hall A

Special Session: HPC and HPDA: Algorithms and Applications

Chairperson: G. Gadzhev

09:30 – 09:55 G. Haase, M. Stoiber, T. Grandits, A. Ilgun, T. Schmickl, Simulation Scenarios in an Artificial Honeybee Hive

09:55 – 10:20 K. Ganev, N. Miloshev, G. Gadzhev, I. Georgieva, V. Ivanov, Evaluation of the Effects of the National Emission Reduction Strategies for Years 2020-2029 and after 2030 on the PM Surface Concentrations on the Territory of Bulgaria

10:20 – 10:45 V. Ivanov, G. Gadzhev, I. Georgieva, K. Ganev, N. Miloshev, Influence of the Grid Resolutions on the Computer Simulated Air Quality Indices Over the Territory of Bulgaria

10:45 – 11:10 M. Pashinska-Gadzheva, I. Bouyukliev, About Methods of Vector Addition over Finite Fields using Extended Vector Registers

Lecture Hall B

Contributed Talks

Chairperson: M. Koleva

09:30 – 09:55 K.-Y. Lu, Economic Implementation of the ORBD Preconditioning for Discretized Optimal Control Problems Constrained with Fractional Diffusion Equations

09:55 – 10:20 Wen-Ting Wu, On Block Version of the Randomized Kaczmarz Method

10:20 – 10:40 S.-Z. Song, Z. Huang, An Inexact Block Factorization Preconditioner for Incompressible Navier-Stokes Equations

DEPARTURE