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
T150  Technological sciences  Material technology 
Liquid-solid processes, Stefan problem, melting, dissolution, freezing, solidification, macroscopic-mezzoscopic-microscopic model, mixture continuum concept, cellular automata concept, phase-field concept, meshless numerical methods, radial basis functions.
Evaluation (rules)
source: COBISS
Researchers (5)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  29096  PhD Agnieszka Z. Guštin  Engineering sciences and technologies  Researcher  2008 - 2011  139 
2.  30833  PhD Umut Hanoglu  Engineering sciences and technologies  Junior researcher  2009 - 2011  38 
3.  28366  PhD Gregor Kosec  Engineering sciences and technologies  Researcher  2008 - 2011  150 
4.  04101  PhD Božidar Šarler  Engineering sciences and technologies  Principal Researcher  2008 - 2011  1,055 
5.  23018  PhD Robert Vertnik  Engineering sciences and technologies  Researcher  2008  214 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  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 cellular 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. The model assumptions will be validated based on the prediction of recent laboratory experiments with metallic binary alloys (Sn-Pb) and data from industrial thin strip casting processes with multicomponent aluminium alloys of industrial interest (Al-Fe-Si-Mn) in recycling. For the first time, innovative meshless solution will be used to solve macroscopic and microscopic equations on non-uniform grids. 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. The existing comparison exercises for Stefan problems will be complemented with new benchmarks for solidification of multicomponent systems. The present study is expected to gain new, experimentally verified basic knowledge regarding the physical modelling of liquid-solid processes and 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 two international conferences and a summer school, coping with Stefan problems, are scheduled in the framework of the present project.
Significance for science
The present research project forms a part of the fundamental research spectra, conducted at the Laboratory for Multiphase Processes, University of Nova Gorica. Research project belongs 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. We demonstrate leading research results in all three mentioned areas. (numerous papers in topmost journals, invited lectures on prestigious conferences and universities, outstanding number of citing, domestic and foreign awards). 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 the cooperation with CISM, the renowned international advanced school of mechanics in Udine in Italy. The leader of the project is the first invited lecturer from Slovenia. Further, the research project acts 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 completed their Ph.D. studies in the framework of this project.
Significance for the country
The completed project has been funded exclusively through support provided by the Slovenian state and listed international projects. However, it is important to remark that the specific upgrades of our previous fundamental projects, which provided knowledge and experience for present project, proved to found application soon after development. Most advanced among of them is modelling the relations between the process parameters and temperature/velocity/concentration fields in continuous casting of aluminium alloys and steel in companies IMPOL, ŠTORE STEEL, ACRONI and pressure die casting in company HIDRIA. The meshless methods have been successfully used in the design of hollow-bricks in Goriške opekarne brickworks. The mentioned examples demonstrate spin-offs of our basic project results which are without doubt important for Slovenian industry. We are continuing to develop new knowledge, applicable in numerous critical technologies, connected with phase change. It is very difficult to prepare a reasonable complete list of possible applications of the acquired knowledge. Melting and solidification appears at some phase 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. The top end knowledge, gained within the completed project, will allow to foster the collaboration and export of Slovenian knowledge to global multinational steel and aluminium industry which is in progress. Last, but not least - the proposed research strengthens Slovenian scientific and cultural heritage and national identity and has to be at home in Slovenia prior to anywhere else! Jožef Stefan (1835-1893) was among the first who made the analytical foundations for liquid-solid processes. In honour of our great scientist, such processes got the name Stefan problems. The completed project contents belong to the field of Stefan problems
Most important scientific results Annual report 2008, 2009, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2008, 2009, final report, complete report on dLib.si
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