Georgi Djambazov

Dr Georgi Djambazov MSc, MEng, PhD, AFHEA

Senior Lecturer in Multi-Physics Simulation

Dr Georgi Djambazov joined the University of Greenwich in 1995 as a post-graduate (PhD) student in Computing and Mathematical Sciences (CMS). After successful completion of his PhD project in Computational Aeroacoustics in 1998 he was offered a position as a Researcher also at CMS where he has been working to date.

Dr Djambazov's background is in Mechanical Engineering and Fluids Engineering with an MEng from the Technical University of Sofia, Bulgaria. An MSc in Decision Support Systems was awarded to him by the University of Sunderland in 1995 after successful completion of the corresponding course. Before coming to England Djambazov was an assistant lecturer at the Department of Hydraulic Machines, Technical University of Sofia where he gained significant experience in the design and modelling of hydraulic turbines, pumps and actuators.

Since 1998 Dr Djambazov has worked as investigator on a number of computational engineering research projects concerned with the numerical modelling of industrial processes involving liquid metals: semi-levitation melting, induction 'skull' melting, aluminium electrolysis, vacuum dezincing, precision casting of reactive alloys, spray atomisation of nickel catalyst particles, continuous casting of steel, vacuum arc remelting of high-strength special alloys, oxygen steel converters, light-alloy processing with external electromagnetic and acoustic fields, lead-refining kettles thermal stresses management, recycled silicon electromagnetic melt purification.

The main computational tool Dr Djambazov uses in his projects is PHYSICA - a flexible multi-physics computational environment for the simulation of inter-related physical phenomena in science and engineering, initiated and developed at the Centre for Numerical Modelling and Process Analysis,  Greenwich.  In 2005 Dr Djambazov became responsible for the further development and maintenance of the PHYSICA software package at Greenwich.  Useful features developed for particular projects but having more general computational modelling significance were added by Dr Djambazov to the package, as well as options for mesh generation and results visualisation that make it independent of external vendors.  Additional experience in larger software development and scientific data management Dr Djambazov gained during the ISECA Interreg environmental project where atmospheric transport of pollutants was simulated by Lagrangian particle dispersion method.

Qualifications

PhD Computational Aeroacoustics
MSc Decision Support Systems
MEng Fluids Engineering

Awards

British Foundry Medal for 2014 for the paper entitled Numerical modelling of the tilt casting process for y-TiAl alloys published in the June 2013 issue of Foundry Trade Journal.

Research / Scholarly interests

  • Computational modelling, Numerical simulations,
  • Mathematical modelling, Process analysis,
  • Computational engineering

Recent publications

Article

Beckwith, Christopher , Djambazov, Georgi, Pericleous, Kyriacos A, Tonry, Catherine E. H. (2022), Comparison of frequency domain and time domain methods for the numerical simulation of contactless ultrasonic cavitation. Elsevier. In: , , , . Elsevier, Ultrasonics Sonochemistry, 89: 10613 . pp. 1-11 ISSN: 1350-4177 (Print), (doi: httpa://doi.org/10.1016/j.ultsonch.2022.106138).

Soar, Peter , Kao, Andrew, Djambazov, Georgi, Pericleous, Kyriacos A (2022), Modelling three-dimensional microstructure evolution influenced by concurrent structural mechanical mechanisms. Springer - Minerals, Metals and Materials Society (TMS). In: , , , . Springer - Minerals, Metals and Materials Society (TMS), JOM (The Member Journal of The Minerals, Metals & Materials Society) . pp. 1-9 ISSN: 1047-4838 (Print), 1543-1851 (Online) (doi: https://doi.org/10.1007/s11837-022-05232-0).

Soar, Peter , Kao, Andrew, Shevchenko, Natalia, Eckert, Sven , Djambazov, Georgi , Pericleous, Kyriacos A (2022), Predicting concurrent structural mechanical mechanisms during microstructure evolution. The Royal Society. In: , , , . The Royal Society, Philosophical Transactions of The Royal Society A: Mathematical, Physical and Engineering Sciences, 380 (2217) . pp. 1-11 ISSN: 364-503X (Print), 1471-2962 (Online) (doi: https://doi.org/10.1098/rsta.2021.0149).

Dybalska, Agnieszka , Caden, Adrian, Griffiths, William D., Nashwan, Zakareya , Bojarevics, Valdis , Djambazov, Georgi , Tonry, Catherine E. H. , Pericleous, Koulis A (2021), Enhancement of mechanical properties of pure aluminium through contactless melt sonicating treatment. MDPI. In: , , , . MDPI, Materials, 14: 4479 (16) ISSN: 1996-1944 (Print), (doi: https://doi.org/10.3390/ma14164479).

Beckwith, Christopher , Djambazov, Georgi, Pericleous, Koulis, Subroto, Tungky , Eskin, Dmitry G. , Skalicky, Ivan , Roberts, Dan , Tzanakis, Iakovos (2021), Multiphysics modelling of ultrasonic melt treatment in the hot-top and launder during direct-chill casting: Path to indirect micro-structure simulation. MDPI. In: , , , . MDPI, Metals, 11 (674) . pp. 1-14 2075-4701 (Online) (doi: https://doi.org/10.3390/met11050674).

Tonry, Catherine E. H. , Bojarevics, Valdis, Djambazov, Georgi, Pericleous, Tonry (2020), Contactless ultrasonic treatment in direct chill casting. Springer. In: , , , . Springer, JOM (The Member Journal of The Minerals, Metals & Materials Society), 72 (11) . pp. 4082-4091 ISSN: 1047-4838 (Print), 1543-1851 (Online) (doi: https://doi.org/10.1007/s11837-020-04370-7).

Pericleous, K. A. , Beckwith, C., Bojarevics, V., Djambazov, G. , Dybalska, A. , Griffiths, W. D. , Tonry, C. (2020), Progress in the development of a contactless ultrasonic processing route for alloy grain refinement. IOP Publishing. In: , , , . IOP Publishing, IOP Conference Series: Materials Science and Engineering, 861: 12070 ISSN: 1757-8981 (Print), 1757-899X (Online) (doi: https://doi.org/10.1088/1757-899X/861/1/012070).

Soar, P. , Kao, A., Djambazov, G., Shevchenko, N. , Eckert, S. , Pericleous, K. (2020), The integration of structural mechanics into microstructure solidification modelling. IOP Publishing. In: , , , . IOP Publishing, IOP Conference Series: Materials Science and Engineering, 861: 12054 ISSN: 1757-8981 (Print), 1757-899X (Online) (doi: https://doi.org/10.1088/1757-899X/861/1/012054).

Tonry, C.E.H. , Djambazov, G., Dybalska, A., Griffiths, W.D. , Beckwith, C. , Bojarevics, V. , Pericleous, K.A. (2020), Acoustic resonance for contactless ultrasonic cavitation in alloy melts. Elsevier. In: , , , . Elsevier, Ultrasonics Sonochemistry, 63: 104959 ISSN: 1350-4177 (Print), (doi: https://doi.org/10.1016/j.ultsonch.2020.104959).

Pericleous, Koulis , Bojarevics, Valdis, Djambazov, Georgi, Dybalska, Agnieszka , Griffiths, William D. , Tonry, Catherine (2019), Contactless ultrasonic cavitation in alloy melts. MPDI. In: , , , . MPDI, Materials, 12: 3610 (21) ISSN: 1996-1944 (Print), (doi: https://doi.org/10.3390/ma12213610).

Manoylov, Anton , Lebon, Bruno, Djambazov, Georgi, Pericleous, Koulis (2017), Coupling of acoustic cavitation with DEM-based particle solvers for modeling de-agglomeration of particle clusters in liquid metals. Springer US. In: , , , . Springer US, Metallurgical and Materials Transactions A, 48 (11) . pp. 5616-5627 ISSN: 1073-5623 (Print), (doi: https://doi.org/10.1007/s11661-017-4321-5).

Djambazov, G. , Bojarevics, V., Pericleous, K., Forzan, M. (2017), Numerical modelling of silicon melt purification in induction directional solidification system. IOS Press. In: , , , . IOS Press, International Journal of Applied Electromagnetics and Mechanics, 53 (S1) . pp. S95-S102 ISSN: 1383-5416 (Print), (doi: https://doi.org/10.3233/JAE-162248).

Lebon, G. S. Bruno , Tzanakis, I., Djambazov, G., Pericleous, K. , Eskin, D. G. (2017), Numerical modelling of ultrasonic waves in a bubbly Newtonian liquid using a high-order acoustic cavitation model. Elsevier. In: , , , . Elsevier, Ultrasonics Sonochemistry, 37 . pp. 660-668 ISSN: 1350-4177 (Print), 1873-2828 (Online) (doi: https://doi.org/10.1016/j.ultsonch.2017.02.031).

Djambazov, G. , Bojarevics, V., Pericleous, K., Croft, N. (2015), Finite volume solutions for electromagnetic induction processing. Elsevier. In: , , , . Elsevier, Applied Mathematical Modelling, 39 (16) . pp. 4733-4745 ISSN: 0307-904X (Print), (doi: http://dx.doi.org/10.1016/j.apm.2015.03.059).

Bojarevics, Valdis , Djambazov, Georgi S., Pericleous, Koulis A. (2015), Contactless ultrasound generation in a crucible. Springer US. In: , , , . Springer US, Metallurgical and Materials Transactions A, 46A (7) . pp. 2884-2892 ISSN: 1073-5623 (Print), 1543-1940 (Online) (doi: http://dx.doi.org/10.1007/s11661-015-2824-5).

Book section

Pericleous, Koulis A. , Bojarevics, Valdis, Djambazov, Georgi, Dybalska, Agnieszka , Griffiths, William , Tonry, Catherine (2019), The contactless electromagnetic sonotrode. Springer. In: , , In: Murat Tiryakioğlu, William Griffiths, Mark Jollyy (eds.), Shape Casting: 7th International Symposium Celebrating Prof. John Campbell's 80th Birthday. Springer, Cham, Switerland (1st) . pp. 239-252 . ISBN: 9783030060336 (doi: https://doi.org/10.1007/978-3-030-06034-3_23) NB Item availability restricted.

Djambazov, G. , Bojarevics, V., Shevchenko, D., Burnard, D. , Griffiths, W. , Pericleous, K. A. (2017), Sensitivity of contactless ultrasound processing to variations of the free surface of the melt with induction heating. Springer International Publishing. In: , , In: Jiann-Yang Hwang, Tao Jiang, Mark William Kennedy, Onuralp Yücel, P. Chris Pistorius, Varadarajan Seshadri, Baojun Zhao, Dean Gregurek, Ender Keskinkilic (eds.), 8th International Symposium on High-Temperature Metallurgical Processing. Springer International Publishing, . pp. 289-298 . ISBN: 9783319513393 (doi: https://doi.org/10.1007/978-3-319-51340-9_29) NB Item availability restricted.

Conference proceedings

Beckwith, Christopher , Subroto, Tungky, Pericleous, Kyriacos A, Djambazov, Georgi , Eskin, Dmitry G , Tzanakis, Iakovos (2021), Ultrasonic melt treatment in a DC casting launder: the role of melt processing temperature. Springer. In: , , In: Linus Perander (ed.), Light Metals 2021. Springer, Cham, Switzerland Light Metals 2021 (1st) . pp. 850-857 . ISBN: 9783030653958ISSN: 2367-1181 (Print), 2367-1696 (Online) (doi: https://doi.org/10.1007/978-3-030-65396-5_112).

Subroto, Tungky , Eskin, Dmitry, Beckwith, Christopher, Tzanakis, Iakovos , Djambazov, Georgi , Pericleous, Koulis (2020), Improving Ultrasonic Melt Treatment Efficiency Through Flow Management: Acoustic Pressure Measurements and Numerical Simulations. Springer. In: , , In: Alan Tomsett (ed.), Light Metals 2020. Springer, Cham, Switzerland . pp. 981-987 . ISBN: 9783030364083ISSN: 2367-1181 (Print), 2367-1696 (Online) (doi: https://doi.org/10.1007/978-3-030-36408-3_132) NB Item availability restricted.

Pericleous, Kyriacos A , Bojarevics, Valdis, Djambazov, Georgi, Dybalska, Agnieszka , Griffiths, William D , Tonry, Catherine E. H. (2019), Alloy grain refinement by means of electromagnetic vibrations. The Minerals, Metals & Materials Society (TMS). In: , , In: Alain Jardy, Alec Mitchell, Mark Ward (eds.), Proceedings of the Liquid Metal Processing & Casting Conference. The Minerals, Metals & Materials Society (TMS), UK . pp. 507-516 . ISBN: 0873397711 (doi: ) NB Item availability restricted.

Tonry, C. E. H. , Djambazov, G., Dybalska, A., Bojarevics, V. , Griffiths, W. D. , Pericleous, K. A. (2019), Resonance from contactless ultrasound In alloy melts. Springer International Publishing. In: , , In: Corleen Chesonis (ed.), Light Metals 2019. Springer International Publishing, Cham, Sitzerlamd . pp. 1551-1559 . ISBN: 9783030058630 (doi: https://doi.org/10.1007/978-3-030-05864-7_196) NB Item availability restricted.

Manoylov, Anton , Djambazov, Georgi, Lebon, Gerard S. B., Pericleous, Koulis (2017), Modelling the deagglomeration of nanoparticle inclusions by ultrasonic melt processing. Curran Associates. In: , , , 24th International Congress on Sound and Vibration 2017 (ICSV 24). Curran Associates, New York, USA , 3 . pp. 1812-1820 . ISBN: 9781510845855 (doi: https://web.archive.org/web/20190315103622/https://www.proceedings.com/35564.html).

Manoylov, Anton , Djambazov, Georgi, Bojarevics, Valdis, Pericleous, Koulis (2016), Multiple timescale modelling of particle suspensions in metal melts subjected to external forces. ECCOMAS Congress 2016. In: , , , ECCOMAS Congress 2016 VII European Congress on Computational Methods in Applied Sciences and Engineering M. Papadrakakis, V. Papadopoulos, G. Stefanou, V. Plevris (eds.) Crete Island, Greece, 5–10 June 2016. ECCOMAS Congress 2016, Athens, Greece , 1 . pp. 8207-8224 . ISBN: 9786188284401 (doi: ).

Djambazov, G. , Bojarevics, V., Pericleous, K., Forzan, M. (2016), Numerical modelling of silicon melt purification in induction directional solidification system. SGEditoriali, Padova. In: , , , HES-16: International Conference on Heating by Electromagnetic Sources. SGEditoriali, Padova, . pp. 595-602 . ISBN: 9788889884324ISSN: 2385-2933 (Print), (doi: ).