Scientific Computing & Software Development

ABOUT

IACM’s long tradition in Numerical Analysis and Scientific Computing research is focused on both fundamental research as well as on applied, industrial applications. Our aim is the development, implementation, evaluation and analysis of numerical methods for the accurate and efficient simulation of challenging continuum and stochastic mathematical models. Our expertise spans on a variety of computational methods and alternative methodologies. Specific applications the team is actively involved with are: computational fluid dynamics, numerical simulation of crack propagation, methods for conservation laws, dispersive wave propagation, viscous flow through heterogeneous media, large scale convective flows, and drift-diffusion systems with applications in solar cells, to name a few.

A considerable effort will be made to pitch as many as current fundamental research projects as possible into potentially interested industrial partners in Greece and abroad, aiming to expand their applicability and to facilitate their transition from enquiry-driven research into technological innovation. 

RESEARCH AND DEVELOPMENT ACTIVITIES

Scientific Computing : We develop algorithms and software for the numerical modelling of complex systems and phenomena. Specific applications group members are actively involved with are: computational fluid dynamics, numerical simulation of crack propagation, methods for conservation laws, dispersive wave propagation, viscous flow through heterogeneous media.

Some recent activities:

  

    • Development of space-time adaptive algorithms for capturing singular phenomena such as: shocks, shear bands, localized solutions of nonlinear evolutionary PDEs. The development of next-generation space-time adaptive algorithms for the numerical approximation of solutions of nonlinear PDEs exhibiting singular behavior. Although adaptive algorithms are increasingly becoming a sought-after computational complexity reduction device in industrial, large scale simulators in various disciplines (aeronautics, material science, structural dynamics, geosciences), their mathematical foundations are still largely unexplored in the more challenging contexts of locally singular phenomena.
    • The development and study of novel, rigorous, structure-preserving numerical methods for the accurate and efficient simulation of challenging kinetic equations with highly complex collision kernels, following exciting recent paradigm-shift developments in the mathematical analysis of such kinetic models. Moreover, notwithstanding the important fundamental research implications, the development of new high-order, structure-preserving numerical simulation capabilities for Boltzmann, Landau or Vlasov-type equations is deemed to enhance the potential of collaboration between IACM and other institutes’ research directions, especially in the context of statistical physics.
    • The simulation and prediction of past and possible future tsunamis in the Aegean and neighbouring seas, and the estimation of tsunami hazard along Greek coasts. Tsunamis are long surface waves of small amplitude and their propagation in the open sea is efficiently modelled by the Shallow Water (SW) equations over variable bottom topography. 

    • The development of novel multiscale numerical methods for flows through heterogeneous materials with specific applications arising in geo-engineering and oil-reservoir/petroleum modelling. The recent development of numerical methods on general polytopic cells/elements (by IACM members), in conjunction with respective modern numerical upscaling techniques has the potential of achieving unprecedented computational complexity reduction in realistic geological porous media flow scenarios.
    • We have considerable expertise on coupling models across scales.  Multiscale models are devised utilising solid numerical analysis methodologies and satisfy certain structure-preserving criteria. The reliability of the approaches taken are checked using mathematical analysis tools. Key applications include atomistic-continuum coupling in the modelling of crack propagation in materials as well as kinetic-continuum coupled models.
    • Rigorous theory for a variety of numerical methods, including a posteriori error bounds for time-dependent problems, fundamental questions for time stepping schemes, analysis of approximation for dispersive problems, finite volume and virtual element methods,  positivity preserving schemes, error analysis for PDE control problems.
    • The development of a general framework for numerical methods on polygonal and polyhedral elements with arbitrary shapes and number of faces based on discontinuous Galerkin approaches, paving the way for next generation computational model reduction approaches.
    • Novel methods for energy minimisation problems, including appropriate discontinuous Galerkin formulations, convergence  analysis towards minimisers, stabilisation mechanisms as solution selection criteria.


Integrated Software products:

The ocean acoustic propagation and inversion codes developed by the wave propagation group are integrated in user-friendly software environments. These environments are integrated in the sense that they provide a broad range of tools and data for properly defining and efficiently solving problems in underwater acoustics. The group has been developing integrated software products for applications such as sonar performance prediction, tomographic analysis, and operational passive acoustic localization, as well as for educational purposes.

Software packages developed:

·VISUAL ACOUSTICS: Acoustic field prediction

·PDA: Passive underwater acoustic detection analysis

·TOMOLAB: Design and analysis of ocean acoustic tomography experiments (OCTOPUS project)

·CALYPSO: Analysis and performance prediction of underwater acoustic detection systems (CASPER project, http://www.iacm.forth.gr/wave/R&D/Calypso.php )

·TRITON: A prototype software environment for bistatic detection analysis (http://triton.iacm.forth.gr/ )

·OCEAN SOUND LAB: An educational software environment offering an introduction to underwater sound (http://osl.iacm.forth.gr/ )


Spatial Decision Support Systems: SDSS are information systems for supporting decision making and have extensive applications in environmental planning, resources allocation, business decision making and other fields. Through an integrated and user-friendly environment, they bring together simulation models, GIS databases, impact assessment methodologies and decision rules. The research of the group concentrates on the integration of simulation models with the GIS systems, the development of various spatial datasets and the design of the end user interface. Application areas studied in the group include: simulation of natural disasters such as floods and forest fires, leaks detection in municipal water distribution systems, and mapping noise levels in urban areas.


The Remote Sensing Lab of IACM (http://rslab.gr) has developed a web-based Decision Support System in the framework of the FLIRE project. The software enables the user to combine information from different models, satellite observations and meteorological measurements and forecasts, supporting what-if analysis in cases of fires and floods, providing fire and flood warnings for local authorities. The system is available online in  http://rslab.gr/downloads_flire.html

Education and Training: The group contributes to the education and training of undergraduate, graduate and post-graduate students as well as of PhD candidates and Postdoctoral researchers.

Scientific Computing & Software Development

RESEARCH AND DEVELOPMENT PROGRAMS

PUBLICATIONS

PEOPLE

RESEARCHERS

  • Georgios Akrivis
  • Panagiotis Chatzipantelidis
  • Konstantinos Chrysafinos
  • Vassilios A. Dougalis
  • Evangelia Flouri
  • Emmanuil Georgoulis
  • Evangelia Kalligianaki
  • Theodoros Katsaounis
  • Charalambos Makridakis
  • Michael Plexousakis
  • Nikolaos Rekatsinas

CONTACT US

For any information regarding the Group, please contact:

Scientific Computing and Software Development Group
Institute of Applied and Computational Mathematics
Foundation for Research and Technology - Hellas
Nikolaou Plastira 100, Vassilika Vouton,
GR 700 13 Heraklion, Crete
GREECE

Tel: +30 2810 391800
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. (Mrs. Maria Papadaki)

Tel.: +30 2810 391805
E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. (Mrs. Yiota Rigopoulou)