The purpose of this paper is to present the solution of a highly nonlinear fluid dynamics in a low Prandtl number regime, typical for metal-like materials, as defined in the call for contributions to a numerical benchmark problem for 2D columnar solidification of binary alloys. The solution of such a numerical situation represents the first step towards understanding the instabilities in a more complex case of macrosegregation. The involved temperature, velocity and pressure fields are represented through the local approximation functions which are used to evaluate the partial differential operators. The temporal discretization is performed through explicit time stepping. The performance of the method is assessed on the natural convection in a closed rectangular cavity filled with a low Prandtl fluid. Two cases are considered, one with steady state and another with oscillatory solution. It is shown that the proposed solution procedure, despite its simplicity, provides stable and convergent results with excellent computational performance. The results show good agreement with the results of the classical finite volume method and spectral finite element method. The solution procedure is formulated completely through local computational operations. Besides local numerical method, the pressure correction is performed locally also, retaining the correct temporal transient. Comment: published invited keynote lecture that received EMERALD Best Paper Award - 2014, published in one of the leading journals in the field: International Journal of Numerical Methods for Heat & Fluid Flow.
E.02 International awards
COBISS.SI-ID: 2599419Own development of numerical modelling of electromagnetic direct chill casting of aluminium alloys is presented in final technical report for aluminium industry IMPOL Slovenska Bistrica. We have developed a multiphysics and multiscale numerical model of stress, temperature, velocity, concentration and microstructure field in round aluminium billets as a function of classsical and low-frequency electromagnetic process parameters. The numerical model entirely relies on meshless methodology, developed in program group. The new technology of lowfrequency direct chill casting is in pilot operation in IMPOL Slovenska Bistrica company.
F.09 Development of a new technological process or technology
COBISS.SI-ID: 1066154Elite international conference on numerical solution of thermofluid problems has been organized at Bled lake. The proceedings have been published at Italian publisher Gianni Editore. Two special numbers of International Journal of Numerical Methods in Heat & Fluid Flow with selected papers from the conference are underway.
C.01 Editorial board of a foreign/international collection of papers/book
COBISS.SI-ID: 13500443This paper represents the elements and the use of the upgraded simulation system, developed in the last half decade for Štore Steel billet continuous caster. The simulation system is used in the context of the state-of-the-art automation and information of the twenty five year old three strand Concast billet continuous caster for dimensions square 140 and 180 mm with the capacity of 160 000 tons/year and a new two strand SMS Demag caster installed in 2016. The simulation system is used in the off-line and on-line modes. The off-line mode is used in order to set the proper process parameters and to calculate the temperature field, macrosegregation, and grain structure of the billet. It is also used to calculate the changes in the caster design such as the secondary cooling and the position of the SEN. The on-line model is used in automatic casting control system. The paper represents an update of our BHM publication of 2005 (Application of Continuous Casting Simulation at Štore Steel, BHM, Vol. 150, No. 9, 300–306). Comment: Paper demonstrates leading results of the program group and their impact in metallurgical industry regarding physics based numerical modelling of the metallurgical processes.
F.09 Development of a new technological process or technology
COBISS.SI-ID: 2761467Reason: Prof. Šarler developed a new, conceptually simple, meshless numerical approach for treatment of partial differential equations based on radial basis functions with local support, and use it to accurately and efficiently solve numerous natural and technical problems with many unknowns. They encompass multiphase and multiscale systems influenced by electromagnetic fields coupled with nonlinear solid and turbulent fluid mechanics. His main contribution is an original general numerical method, with qualities such as no need for mesh and local integration, simple numerical implementation, adaptivity and usefulness for complex geometries in multiple dimensions. Together with his co-workers he applied the method to systems design in large foreign research centers and for domestic and foreign metallurgical industry. He published the mentioned research in 30 notable articles in leading world scientific journals in the field of development and application of numerical methods. He also received multiple international awards and served as an invited lecturer at several international conferences, universities, and institutes.
E.01 National awards