Projects / Programmes source: ARRS


Research activity

Code Science Field Subfield
2.13.01  Engineering sciences and technologies  Process engineering  Multi-phase systems 

Code Science Field
T000  Technological sciences   

Code Science Field
2.11  Engineering and Technology  Other engineering and technologies 
Liquid-solid processes, Stefan problem, melting, dissolution, freezing, solidification, macroscopic-mezzoscopic-microscopic model, multiphysics models, mixture continuum concept, novel point automata concept, meshless numerical methods, radial basis functions, numerical optimization, evolutionary computation.
Evaluation (rules)
source: COBISS
Researchers (19)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  03975  PhD Igor Belič  Natural sciences and mathematics  Researcher  2011 - 2014  273 
2.  21559  PhD Darja Feizpour  Engineering sciences and technologies  Researcher  2011 - 2014  160 
3.  05026  PhD Bogdan Filipič  Engineering sciences and technologies  Researcher  2011 - 2014  469 
4.  29096  PhD Agnieszka Z. Guštin  Engineering sciences and technologies  Researcher  2011  139 
5.  30833  PhD Umut Hanoglu  Engineering sciences and technologies  Junior researcher  2011 - 2014  38 
6.  05675  PhD Monika Jenko  Medical sciences  Researcher  2011 - 2014  822 
7.  28366  PhD Gregor Kosec  Engineering sciences and technologies  Researcher  2011 - 2014  150 
8.  33263  Gregor Košak  Engineering sciences and technologies  Junior researcher  2011 
9.  21381  PhD Miha Kovačič  Engineering sciences and technologies  Researcher  2011 - 2014  240 
10.  07642  PhD Vojteh Leskovšek  Engineering sciences and technologies  Researcher  2011 - 2014  359 
11.  33584  PhD Qingguo Liu  Engineering sciences and technologies  Junior researcher  2011 - 2014  30 
12.  36364  PhD Boštjan Mavrič  Engineering sciences and technologies  Junior researcher  2013 - 2014  83 
13.  32926  PhD Miha Mlakar  Engineering sciences and technologies  Junior researcher  2011 - 2014  53 
14.  31396  PhD Besnik Poniku  Engineering sciences and technologies  Junior researcher  2011 - 2014  29 
15.  33291  PhD Nuša Pukšič  Engineering sciences and technologies  Junior researcher  2011 - 2014  16 
16.  16095  PhD Danijela Anica Skobir Balantič  Engineering sciences and technologies  Researcher  2011 - 2014  114 
17.  04101  PhD Božidar Šarler  Engineering sciences and technologies  Principal Researcher  2011 - 2014  1,055 
18.  24894  PhD Tea Tušar  Engineering sciences and technologies  Researcher  2011 - 2014  198 
19.  23018  PhD Robert Vertnik  Engineering sciences and technologies  Researcher  2011 - 2014  214 
Organisations (3)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0106  Jožef Stefan Institute  Ljubljana  5051606000  85,777 
2.  0206  Institute of Metals and Technology  Ljubljana  5051622000  5,703 
3.  1540  University of Nova Gorica  Nova Gorica  5920884000  13,238 
The scientific goals of this research project focus on enhancement of the physical modelling capabilities and further development of numerical methods for liquid-solid processes. The physical modelling of liquid-solid systems will be on the macroscopic scale based on volume-averaged one-phase formulation and on the microscale on the point automata concept. This framework will be used to study the equiaxed and columnar solidification by connecting the macroscopic transport phenomena with the microstructure evolution. The mass, momentum, energy and species equations will be simultaneously solved on microscopic and macroscopic levels. The emphasis will be put on the development of simulation system for prediction of macrosegregation. This system will be enhanced with the optimization framework which will allow minimisation of concentration and structural inhomogeneities in the solidified material by influencing the dynamics of process parameters. The model assumptions will be validated based on the predictions of domestic and foreign laboratory experiments with metallic binary alloys (Sn-Pb and Al-Cu) and data from industrial continuous casting process with spring steels of technological interest (51CrMoV4). For the first time, innovative meshless solutions will be used to solve macroscopic and microscopic equations on non-uniform grids and complicated geometries. Recently developed explicit local radial basis function collocation method will be enhanced with combined p-, r-, and h- adaptivities for efficient handling of the involved large number of unknowns and micro-cells/points. The existing comparison exercises for Stefan problems will be complemented with new benchmarks for solidification of multicomponent systems and turbulent conditions. The project is based on further development of our internationally recognised and awarded breakthrough results, achived in the last few years: the first demonstration of adaptive simulations by a local meshless method, new efficient pressure correction algorithm, first solution of engineering turbulence modelling by a meshless method, and a completely new meshless concept for simulations of microstructure evolution that is based on the point automata instead of the cellular automata, succesfully used in simulation of mesoscopic grain structure and microscopic dendritic growth. Development of numerous industrial simulation systems, based on this new precompetitive knowledge (continuous casting of aluminium alloys and steel, thin strip casting, pressure die casting, etc.) The proposed study is expected to gain new, experimentally verified basic knowledge regarding the physical modelling of liquid-solid processes and a meshless solution of relevant coupled set of transport equations. The study is expected to influence further experimental and theoretical developments, design and education. Specific upgrades of the deduced basic knowledge will be used for simulation of various processes in nature and technology. Organisation of three international conferences and a summer school, dealing with Stefan problems, are scheduled in the framework of the proposed project.
Significance for science
The present research project forms a part of the fundamental research spectra of the project group. Research achievements belong to the modern research area of modelling, simulation and optimisation of processes and materials which plays an increasingly important role in international research because of the needs for inexpensive products with a large know-how input, for new materials and environmentally friendly technologies. Our research contents are actively integrated in this research area by their basic and applied components. In the framework of our fundamental research, we seek new approaches in modelling of solid-liquid systems at coupled microscopic and macroscopic scales by using advanced meshfree methods for transport phenomena computation in the presence of moving boundaries. We are also involved in the development of international test cases for Stefan problems and comparisons between numerical models and experiments. The completed project demonstrates leading research results in all three mentioned areas. The described research has a direct link to international research area through several international projects. International education, originating from the present research topics, results in cooperation with renowned international advanced summer schools. Further, the research project acted as a base for the new graduate education module Modelling of Materials and Processes within Bologna study Physics III, Faculty of Applied Sciences, University of Nova Gorica. Four post-graduate students, involved in present project completed the mentioned module. The optimization methodology that is used to supplement modelling and simulation of processes is related to the course Optimization of Resources and Processes, given at the University of Nova Gorica, and the course Multiobjective Optimization and Design, given at the Jožef Stefan International Postgraduate School.
Significance for the country
We developed new knowledge, applicable in numerous critical technologies, connected with phase changes in the framework of the project. It is very difficult to prepare a reasonable complete list of possible applications of the acquired knowledge of the project. Melting and solidification appears at some stage in the production of almost every man-made product. The model supported optimisation and automation of such processes represents the key for modern production and processing of metals, ceramics, polymers, composite materials and electronic components. We have organised four international meetings which will promoted Slovenia. Six Ph.D. students completed their studies in the framework of the proposed project: four in the area of Stefan problems, one in the area of optimisation and one in the area of experimental methods. We participated in organisation of International summer school on meshless methods at University of Naples "Parthenope". We have developed new knowledge that will help us to participate in new international research collaborations. We obtained two international awards. With the knowledge gained through this project, we will extend our industrial impact. Slovenia has approx. 100 companies in the field of alloy manufacturing with approx. 10.000 working places, the yearly income is around 1.5 billion €. Slovenia has also approx. 50 casthouses with 4000 working places and their yearly income is around 0.5 billion €. The export of the mentioned companies all over the world is about 70%. The project team has a big end-user pull from these companies.
Most important scientific results Annual report 2011, 2012, 2013, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2011, 2012, 2013, final report, complete report on dLib.si
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