Dr Miroslav A. Sijerčić was born on June 18th 1942, in Belgrade. In 1967, Miroslav Sijerčić graduated the Mechanical Engineering Faculty (Department for Thermal Engineering) at University of Belgrade. In 1968, he started to work with Institute of Thermal and Nuclear Engineering, Energoinvest-ITEN, Sarajevo. He worked with the Institute as a young researcher, a project manager to an advisor. With his participation, studies and developments were carried out on the problem of safety and optimization of power and technological systems and novel production technique. The basic field of his work was and remained experimental investigations and modeling of turbulent flows in various processes.

His first really meeting with science had been during his graduated study which had been organized with participation of the known professors from various country (e.g. B. Launder for Turbulence modelling or B. Bird for Transport Phenomena). In 1977, he received diploma of M.Sc. for the work: “Particles trajectories in turbulent swirl flows in axisymmetric channels”. It was the first work in former Yugoslavia in the field of two-phase turbulent flow modeling. Afterwards, he has been trying to solve different problems by means of turbulent flow modelling. With team of his younger colleagues, he organized in the institute the department for coal conversion technologies (high temperature combustion, pulverized coal gasification, smokeless fuel). Development of the processes has been accomplished by modelling based on mathematical model of turbulence.

**He got his Ph.D. degree working with Prof. K. Hanjalic on the theme “Mathematical model of simultaneous combustion and gasification of pulverized coal.”** The simulation model treats the flow as a chemically reactive multi-component two-phase mixture with Eulerian description of the gas phase and Lagrangian description of the particles movement, their heating and mass change. The closure of the time averaged transport equations has been achieved by two-equation turbulence model with the inclusion of mass exchange between the phases due to chemical reaction and six flux model of the radiative heat exchange. Momentum, heat and mass phase coupling is achieved on the basis of so called PSI-CELL concept. Reactions of combustion are represented by the combined kinetic-diffusion reaction rates. Thermodynamic and transport properties necessary for obtaining realistic results are derived from equations of state, semi-empirical relationships and regressions of tabulated data. In the model development, he was with support by **USA-Yugoslav Joint Board for Technological Corporation collaborating with Washington State University (Prof. Clayton Crowe).**

Since 1992, he worked with Vinča Institute of Nuclear Sciences in Laboratory for Thermal Engineering and Energy. **He was leader of the group for mathematical modeling of combustion processes.** He mainly dealt with different turbulence model improving and upgrading and their application for the simulation of various flows. Most of them were two phase flows. For high temperature optically transparent media, he adapted a zonal model of heat transfer. The mathematical model is based on the Hottel zone method of radiative heat transfer. The simulations model, besides radiative heat transfer, treats convective, conductive and heat flux due to combustion chemical reactions of the process. Up to now, flow patterns used with the considered problems are estimated. For modelling some flows (e.g. swirl flow or jet flame), he used full Reynolds stress closure. Closure of the system of Reynolds equations of momentum and continuity for stationary turbulent flow of incompressible fluid has been carried out based on the solution of equations for the all components of turbulent stress. For modeling of Reynolds stress components approximations mainly based on the model originally proposed by Launder, Reece and Rodi have been chosen.

Dr Miroslav Sijerčić is author of the book **“Mathematical Modelling of Complex Turbulent Transport Processes”** (in Serbian) in which he collected his up to now experience in the field of mathematical modeling of turbulence. The book offers an overview of the mathematical models used to solve various problems in turbulent fluid mechanics with or without heat and mass transfer and chemical reaction (particularly of combustion) in a single or two phase flows. This text provides a documented critical survey of the mathematical models and gives state-of-the art description of approaches for the problem of different level of complexity. The book covers mathematical modeling of turbulent transport processes from fundamentals to applications.

From July 1999 to June, **he was visiting researcher with German office of AEA Technology GmbH, Otterfing, Germany**. During this time Dr Miroslav Sijercic worked on the examination of two-phase flow models in various flow configurations in the scope of FORTWIHR Research project: “Numerical Simulation of Multi-Phase Flows on High-Performance Computers”. Between the rest, **the results of the work have been used for further optimization and improving the quality of CFX-TASCflow software of AEA Technology GmbH.**

**During his stay at LSTM** (Lehrstuhl fur Stroemungsmechanik, Freidrich-Alexander-Universitaet, Erlangen, Germany) from October 2000 until October 2003 Dr Miroslav Sijercic worked on the mathematical modeling of precipitation process in the stirred reactor in the scope of OPTIMUM project funded by EC. **An improved version of the mathematical model was finally implemented into a commercial CFD code (CFX5.6 software).**

**Since 2005, he was leading the scientific projects** supported by the Republic of Serbia Ministry of Education, Science and Technological Development:

2005-2007, Modeling and numerical simulation of turbulent flow and thermal processes in utility boiler furnaces;

2008-2009, Development and application of models and softwares for simulaton of processes in pulverized coal-fired utility boiler furnaces for the purpose of increasing energy efficiency and reducing emission of pollution.

He was one of leading scientists in cooperation between Institute Vinča and Electric Power Industry of Serbia, within the field of development and application of numerical models of processes in utility boiler pulverized coal-fired furnaces.

He published many scientific papers and technical solutions, including manuscripts in leading international journals, cited in a number of referent publications worldwide.

During his career, also after retirement in 2009, dr Miroslav Sijerčić has been **contributing to Ph.D. students investigations and theses.**

- K. Hanjalić, M. Sijerčić, C.T. Crowe, S. Wojcinski, Analysis of two-stream direct coal gasification system, Technical Meeting: Advances in Combustion Research, San Antonio, USA, 1985, pp. 220-226
- K. Hanjalić, M. Sijerčić, C.T. Crowe, S. Wojcinski, Modeling of a high temperature coal gasification process in a two stream reactor, The Third Chemical Congress of North America, Symposium on Mathematical Simulation of Coal Conversion Processes, Toronto, 1986, pp. 138-144
- K. Hanjalić, M. Sijerčić, Mathematical model of simultaneous co-curent coal combustion and gasification, "Refined flow modelling and turbulence meassuerments", Paris, Presses de l'ecole nationale des Ponts et shausses, 1993, pp. 433-440
- K. Hanjalić, M. Sijerčić, Application of computer simulation in design study of a new concept of pulverized coal gasification, Part I. Rationale of the concept and model of hydrodynamic and heat transfer in the reactor", Combustion Science and Technology 97 (1994), 4-6, pp. 331-350
- M. Sijerčić, K. Hanjalić, Application of computer simulation in design study of a new concept of pulverized coal gasification, Part II. Model of coal reactions and discussion of results, Combustion Science and Technology 97 (1994), 4-6, pp. 351-375
- S. Oka, M. Sijerčić, P. Stefanović, S. Nemoda, G. Živković, Mathematical modeling of the complex turbulent flows-recent achievements in Vinča Institute, Russian Journal of Engineering Thermophysics, Vol. 4, No. 3, 1994, pp. 240-265
- M. Sijerčić, G. Živković, S. Oka, The comparasion of stochastic and diffusion models of dispersed phase in two-phase flows, International Symposium on Two-Phase Modeling and Experimentation, Rome, Italy, 1995, pp. 375-382
- M. Sijerčić, V. Vujović, A. Saljnikov, Modeling of pulverized coal gasification in low temperature plasma swirl flow, Thermal Plasma Processes, VDI Berichte 1166, ISBN 3-18=091166-2, VDI-Verlag GmbH-Dusseldorf, Germany, 1995, pp. 565-572
- M. Stakić, M. Sijerčić, Numerical analysis of coal drying process in a fixed bed, Process Technique, No 3-4, Belgrade, 1996, pp. 104-108
- M. Sijerčić, S. Nemoda, S. Oka, V. Bakić, Eddy dissipation concept in jet flame modelling, Russian Journal of Engineering Thermophysics, Vol. 6, No. 2, 1996, pp. 161-175
- M. Sijerčić, S. Nemoda, Zonal numerical simulation of heat transfer in a furnace, Proceedings, the 2nd European Thermal-Science and the 14th UIT National Heat transfer Conference, Roma, Italy, 1996, pp. 1455-1461
- M. Sijerčić, S. Nemoda, S. Oka, V. Bakić, Study of turbulent jet with combustion, Proceedings, the First European Congress on Chemical Engineering (ECCE-1), Florence, 1997, pp. 25-28
- M. Stakić, M. Sijerčić, Numerical analysis of drying process in a fixed bed, Proceedings, the First European Congress on Chemical Engineering (ECCE-1), Florence, 1997, pp. 1145-1148
- M. Sijerčić, S. Nemoda, V. Bakić, Modeling of turbulent premixed jet flame by means of second order closure, 2nd Int. Symposium on Turbulence, Heat and Mass Transfer, K. Hanjalić, T.W.J. Peeters (Editors), Delft University Press, The Netherlands, 1997, pp. 729-738
- Miroslav Sijerčić, Stevan Nemoda, Swirl flow simulation by means of Reynolds stress turbulent modeling, Eleventh Symposium on Turbulent Shear Flow, Volume 3, Grenoble, France, 1997, pp. P3-41/P3-46
- M. Sijerčić, V. Bakić, A. Ačanski, Plane wall jet, II Proceedings, the 6th Ercoftac/Iahr/Cost Workshop on Refined Flow Modelling, June 6-7, 1997 Delft, the Netherlands, pp. 45-51
- M. Sijerčić, S. Nemoda, N. Crnomarković, Analysis of coal gasification in hydrogen swirl flame by means of mathematical modelling, Advanced Concepts and Techniques in Thermal Modelling, EUROTHERM Seminar No. 53, Mons, Belgium, Oct. 1997, pp. 92-93
- M. Stakić, G. Živković, M. Sijerčić, Numerical analysis of discrete phase influence of gas flow in a two phase turbulent free jet, International Mechanical Engineering Congres, ASME Annual Meeting, 1997 Symposium "Spray System Technology", Dallas, 16-21 November 1997, pp. 501-506
- M. Sijerčić, Mathematical modeling of complex turbulent transport processes, Yugoslav Society of Thermal Engineers & Institute of Nuclear Sciences Vinča, Belgrade, 1998 (in Serbian)
- Miroslav Sijercic, Florian Menter, Examination of two-phase flow model in variouous flow configurations, Thermal Science 4 (2000), 2, pp. 5-32
- Miroslav Sijerčić, Žarko Stevanović, Srdjan Belošević, Modeling of non-confined turbulent flow of two coaxial streams under combustion conditions, FACTA UNIVERSITATIS, Series: Mechanical Engineering 1 (2001), 8, pp. 981–988
- Srdjan V. Belosevic, Simeon N. Oka, Miroslav A. Sijercic, Development of three-dimensional mathematical model for pulverized coal boiler furnaces, 3rd International FORTWIHR Conference 2001-High performance Scientific and engineering Computing-Methods, Developments and Applications, Erlangen, Germany, 12th-14th March 2001, Book of Abstracts, Combustion Related Flows, pp. 1- 4
- Miroslav Sijercic, Florian Menter, Numerical grid refinement in modelling two-phase swirl flow, Thermophysics and Aeromechanics, 10 (2003), 2, pp. 163-174
- Belošević S., Sijerčić M., Stevanović Ž., Modeling of isothermal swirling two-phase flow through a pipe expansion with diffusion model for particle dispersion, Theoretical and Applied Mechanics, Special Volume (1), 2004, pp. 35-38
- Ž. Stevanović, M. Sijerčić, S. Belošević, M. Benišek, Turbulence modeling of confined swirling flow, Theoretical and Applied Mechanics, Special Volume (1), 2004, pp. 395-398
- M. Sijerčić, Ž. Stevanović, S. Belošević, Gas-particle two-phase turbulent free jet, Theoretical and Applied Mechanics, Special Volume (1), 2004, pp. 371-374
- Miroslav Sijerčić, Srđan Belošević, Predrag Stefanović, Modeling of pulverized coal combustion stabilization by means of plasma torches, Thermal Science 9 (2005), 2, pp. 57-72
- Srđan Belošević, Miroslav Sijerčić, Predrag Stefanović, Simulation of utility boiler pulverized coal fire start up for the Purpose of the process optimization, Proceedings, the Second International Conference on Applied Thermodynamics, edited by Hasan Heperkan, Ugur Kesgin and Semra Ozkan, ATC’05, Yildiz Technical University, International Centre for Applied Thermodynamics, Istanbul-Turkey, May 18-20, 2005, pp. 205-212
- S. V. Belošević, M. A. Sijerčić, S. N. Oka, T. Živanović, Simulation of pulverized coal tangentially fired furnace, by a three-dimensional mathematical model, ECCOMAS Thematic Conference on Computational Combustion, Lisbon, Portugal, 21-24 June, 2005, Instituto Superior Tecnico, CD-ROM Proceedings, pp. 1-20 (Book of Abstracts, pp. 21)
- Srđan Belošević, Miroslav Sijerčić, Simeon Oka, Dragan Tucaković, Three-dimensional modeling of utility bolier pulverized coal tangentially fired furnace, International Journal of Heat and Mass Transfer 49 (2006), pp. 3371-3378
- Vukman Bakić, Stevan Nemoda, Miroslav Sijerčić, Valentina Turanjanin, Branislav Stankovic, Experimental and numerical investigation of premixed acetylene flame, International Journal of Heat and Mass Transfer 49 (2006), pp. 4023-4032
- Miroslav Sijerčić, Srđan Belošević, Žarko Stevanović, Simulation of free turbulent particle-laden jet using Reynolds-stress gas turbulence model, Applied Mathematical Modelling 31 (2007), pp. 1001-1014 57
- R. V. Filkoski, S. V. Belosevic, I. J. Petrovski, S. N. Oka, M. A. Sijercic, Computational fluid dynamics technique as a tool for description of the phenomena occurring in pulverized coal combustion systems, Proc. IMechE, Part A: Journal of Power and Energy, 221 (2007), 3, pp. 399-409
- S. Belosevic, M. Sijercic, P. Stefanovic, D. Cvetinovic, Modeling study of a utility boiler pulverized coal ignition by means of plasma torches, Proceedings: Full-Papers CD (Edited by K. Tachibana, O. Takai, K. Ono, T. Shirafuji, ISBN978-4-9903773-3-5), 18th International Symposium on Plasma Chemistry ISPC-18, August 26-31, 2007, Kyoto University, Japan, paper 28P-191, pp. 1-48
- Srđan Belošević, Miroslav Sijerčić, Predrag Stefanović, A numerical study of pulverized coal ignition by means of plasma torches in air-coal dust mixture ducts of utility boiler furnaces, International Journal of Heat and Mass Transfer 51 (2008), pp. 1970-1978
- Srdjan Belosevic, Miroslav Sijercic, Dragan Tucakovic, Nenad Crnomarkovic, A numerical study of a utility boiler tangentially-fired furnace under different operating conditions, Fuel 87 (2008), pp. 3331-3338
- Srdjan Belosevic, Miroslav Sijercic, Nenad Crnomarkovic, Branislav Stankovic, Dragan Tucakovic, Numerical prediction of pulverized coal flame in utility boiler furnaces, Energy & Fuels 23 (2009), pp. 5401-5412
- Srdjan Belosevic, Miroslav Sijercic, Nenad Crnomarkovic, Branislav Stankovic, Numerical optimization of combustion and flame in pulverized coal-fired furnaces with respect to energy efficiency, Conference Full Text CD (ISBN 978-83-929704-0-8), Energy Efficiency and Air Poluttant Control Conference, Wroclaw 2009, Wroclaw, Poland, September 21-25, 2009, pp. 1-37
- Srdjan Belosevic, Miroslav Sijercic, Branislav Stankovic, Nenad Crnomarkovic, Slobodan Djekic, Modeling and optimization of NOx emission and pulverized coal flame in utility scale furnaces, Proceedings (CD-ROM, ISBN #: 1-890977-27-6), Twenty-Seventh Annual International Pittsburgh Coal Conference, October 11-14, 2010, Istanbul, Turkey, PCC 2010, paper 49-3, pp. 1-22
- Milan Stakić, Goran Živković, Miroslav Sijerčić, Numerical analysis of discrete phase induced effects on a gas flow in a turbulent two-phase free jet, International Journal of Heat and Mass Transfer 54 (2011), 11–12, pp. 2262-2269
- Branislav Stanković, Srđan Belošević, Miroslav Sijerčić, Exploration study of fully developed two-dimensional turbulent channel flow with Reynolds stress closures, Proceedings (CD-ROM, ISBN 978-86-7083-725-6), III International Symposium Contemporary Problems of Fluid Mechanics, May 12-13, 2011, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia, pp. 47-57
- Nenad Crnomarkovic, Miroslav Sijercic, Srdjan Belosevic, Branislav Stankovic, Dragan Tucakovic, Titoslav Zivanovic, Influence of forward scattering on prediction of temperature and radiation fields inside the pulverized coal furnace, Energy 45 (2012), pp. 160-168
- Nenad Crnomarkovic, Miroslav Sijercic, Srdjan Belosevic, Dragan Tucakovic, Titoslav Zivanovic, Influence of application of Hottel's zonal model and six-flux model of thermal radiation on numerical simulations results of pulverized coal fired furnace, Thermal Science 16 (2012), 1, pp. 271-282
- Nenad Crnomarkovic, Miroslav Sijercic, Srdjan Belosevic, Dragan Tucakovic, Titoslav Zivanovic, Numerical investigation of processes in the lignite-fired furnace when simple gray gas and weighted sum of gray gases are used, International Journal of Heat and Mass Transfer 56 ( 2013), pp. 197-205
- Srdjan Belošević, Ivan Tomanović, Vladimir Beljanski, Miroslav Sijerčić, Dragan Tucaković, Titoslav Živanović, Numerical prediction of processes for clean and efficient utilization of pulverized coal in power plants, USB Proceedings, Sixth International Conference on Clean Coal Technologies CCT2013, 12-16 May 2013, Thessaloniki, Greece (organized by: IEA Clean Coal Centre, UK, Aristotle University of Thessaloniki, University of Western Macedonia Greece), Session: Combustion, pp. 1-23 (http://www.cct2013.org/ibis/CCT2013/my-event