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Dr Andrej Horvat

Professional Activities

Industry Sectors

  • Energy
    • Combustion of biofuels
    • Wood degasification, pyrolysis & combustion
    • Analysis of wind turbines
  • CFD
    • Validation of Large Eddy Simulation Models
    • Reynolds Stress Model customisation
    • Fluid flow and heat transfer modelling using RANS & LES models
    • Development of semi-analytic models using Galerkin method
  • Oil & Gas
    • Simulation of Chemical Reactors
  • Fire
    • Flashover & fire spread analyses
    • Gravity currents & backdraft phenomena
  • Nuclear Engineering
    • Water hammer shock propagation
    • Heat exchanger analysis using LES & DNS approaches
    • Analysis of thermal jet penetration
    • Modelling of turbulent buoyant flows in nuclear accident conditions
  • Fluid-Structure Interaction
    • Analysis of large displacement membranes under wind loading

Specialist Skills

  • Expert in the use of ANSYS-CFX software suite
  • Analysis of fire dynamics
  • Combustion

Education

MSc Mechanical Engineering
University of California, Los Angeles

Ph.D. Nuclear Engineering
University of Ljubljana, Slovenia

MSc Nuclear Engineering
University of Ljubljana, Slovenia

Dipl. – Ing Mechanical Engineering
University of Maribor, Slovenia

Additional Information

Journal Articles

  • Horvat, A., Sinai, Y.L., “Numerical Simulation of Backdraft Phenomena”, Fire Safety J., 2007, Vol. 42, Issue 3, pp. 200-209.
  • Horvat, A., Mavko, B., “Momentum and Heat Transfer in a Bundle of Wing-Shaped Tubes”, J. Heat Transfer, Trans ASME, 2006, Vol. 128, pp. 970-973.
  • Galgano, A., Di Blasi, C., Horvat, A., Sinai,Y., “Experimental Validation of a Coupled Solid- and Gas-Phase Model for Combustion and Gasification of Wood Logs”, Energy and Fuels, July, 2006.
  • Horvat, A., Mavko, B., “Heat Transfer Conditions in Flow Across a Bundle of Cylindrical and Ellipsoidal Tubes”, Num. Heat Transfer, Part A, 2006, Vol. 49, pp. 699–715.
  • Horvat, A., Leskovar, M., Mavko, B., “A Comparison of Heat Transfer Conditions in Tube Bundle Cross-Flow for Different Forms of Tubes”, Int. J. Heat Mass Transfer, 2006, Vol. 49, 5-6, pp. 1027-1038.
  • Horvat, A., Mavko, B., Catton, I., “The Galerkin Method Solution of the Conjugate Heat Transfer Problems for the Cross-Flow Conditions”, J. Mech. Eng., 2005, 51, 7-8, pp. 527-533.
  • Horvat, A., Mavko, B., “Calculation of Conjugate Heat Transfer Problem with Volumetric Heat Generation Using the Galerkin Method”, J. Applied Math. Modelling, 2005, 29, pp. 477-495.
  • Horvat, A., Mavko, B., “Hierarchic Modeling of Heat Transfer Processes in Heat Exchangers”, Int. J. Heat Mass Transfer, 2005, 48, pp 361-371.
  • Tiselj, I., Horvat, A., Mavko, B., Pogrebnyak, E., Mosyak, A., Hetseroni, G., “Wall Properties and Heat Transfer in Near-Wall Turbulent Flow”, Num. Heat Transfer, Part A , 2004, 46, pp. 717-729.
  • Horvat, A., Catton, I., “Application of Galerkin Method to Conjugate Heat Transfer Calculation”, Num. Heat Transfer, Part B: Fundamentals, 2003, 44, pp. 509-531.
  • Horvat, A., Catton, I., “Numerical Technique for Modeling Conjugate Heat Transfer in an Electronic Device Heat Sink”, Int. J. Heat Mass Transfer, 2003, 46, pp. 2155-2168.
  • Horvat, A., Catton, I., “An Analysis of Conjugate Heat Transfer in an Electronic Chip Heat Sink”, J. Mech. Eng., 2002, 9, pp. 482-490.
  • Horvat, A., Kljenak, I., Marn, J., “Two-Dimensional Large Eddy Simulation of Natural Convection Due to Internal Heat Generation”, Int. J. Heat Mass Transfer, 2001, 44, pp. 3985-3995.
  • Horvat, A., Kljenak, I., Marn, J., “On Incompressible Buoyancy Flow Benchmarking”, Num. Heat Transfer, Part B: Fundamentals, 2001, 39, pp. 61-78.

Book Chapters

  • Horvat, A., Rizzi, M., Catton, I., “Advanced Computational Methods in Heat Transfer VII: Numerical Investigation of Chip Cooling Using Volume Averaging Technique (VAT)”, WIT Press, Southampton, UK, 2002, pp. 373-382.
  • Horvat, A., Kljenak, I., Marn, J., “Advanced Computational Methods in Heat Transfer V: Numerical Prediction of Cooling Margins for a Fluid with Internal Heat Generation”, WIT Press, Southampton, UK, 1998, pp. 17-19.

Conference Presentations & Proceedings

  • Horvat, A., Mavko, B., “Numerical Investigation of Natural Convection Heat Transfer in Volumetrically Heated Spherical Segments”, Int. Conf. “Nuclear Energy for New Europe 2004”, Portoro_, Slovenia, Sept. 6-9, 2004, Proceedings, No. 408.
  • Horvat, A., Mavko, B., Catton, I., “The Galerkin Method Solution of the Conjugate Heat Transfer Problems for the Cross-Flow Conditions”, Proceedings, The ASME-ZSIS Int. Thermal Science Seminar II, Bled, Slovenia, June 13-16, 2004, pp. 951-958.
  • Tiselj, I., Horvat, A., Mavko, B., Pogrebnyak, E., Mosyak, A., Hetseroni, G., “Effect of Wall Thermal Properties on the Mean Temperature Profile in Near-Wall Turbulence”, Turbulence, Heat and Mass Transfer 4, K. Hanjalic, Y. Nagano, M. Tummers (Editors), Begell House, 2003.
  • Tiselj, I., Gale, J., Horvat, A., Parzer, I., “Characteristic and Propagation Velocities of the Two-Fluid Models”, The 10th Int. Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-10), Seoul, Korea, October 5-9, 2003, Proceedings.
  • Horvat, A., Sinai, Y.L., “Validation of Two-Equation Turbulence Models for Heat Transfer Applications”, 8th UK National Heat Transfer Conference, Oxford, Sept. 9-10, 2003, Proceedings.
  • Horvat, A., Catton, I., “Modeling of Forced Convection in an Electronic Device Heat Sink as Porous Media Flow”, 2002 ASME International Mechanical Engineering Congress and Exposition, November 17-22, 2002, New Orleans, LA, USA, Proceedings, IMECE2002/HTD-34246.
  • Horvat, A., Kon_ar, B., “Hierarchic Modeling of Heat Exchanger Thermal Hydraulics”, Int. Conf. “Nuclear Energy for New Europe 2002”, Kranjska Gora, Slovenia, Sept. 9-12, 2002, Proceedings, No. 209.
  • Horvat, A., Catton, I., “Modeling of Conjugate Heat Transfer Using Galerkin Approach”, Proceedings, International Symposium on Compact Heat Exchangers, Grenoble, France, Aug. 24, 2002, pp. 191-197.
  • Tiselj, I., Horvat, A., “Accuracy of the Operator Splitting Technique for Two-Phase Flow With Stiff Source Terms”, The ASME Fluids Engineering Division Summer Meeting 2002, Montreal, Canada, July 13-19, 2002, Proceedings, FEDSM2002-31349.
  • Horvat, A., Catton, I., “Development of an Integral Computer Code for Simulation of Heat Exchangers”, Nuclear Energy in Central Europe 2001, Portoro_, Slovenia, Sept. 10-13, 2001, Proceedings, No. 213.
  • Horvat, A., Kljenak, I., Marn, J., “Dynamics of Heat Transfer in the Melt Pool at Nuclear Severe Accident Conditions”, The 1999 ASME International Mechanical Engineering Congress and Exposition, Nashville, Tennessee, USA, Nov. 14-19, 1999, Proceedings, pp. 285-292.
  • Horvat, A., Kljenak, I., Marn, J., “Dynamic Behavior of the Melt Pool at Severe Accident Conditions”, The 1999 NURETH-9 Conference, San Francisco, California, USA, Oct. 3-8, 1999, Proceedings, pp. 1-15.
  • Horvat, A., Kljenak, I., Marn, J., “Numerical Estimation of Reactor Core Melt Cooling”, Transactions of the American Nuclear Society, La Grange Park, Illinois, USA, American Nuclear Society, 1998, Vol. 79, pp. 380-381.
  • Horvat, A., “Testing the Numerical Method for One-Dimensional Shock Treatment”, The 5th Regional Meeting “Nuclear Energy in Central Europe”, ate, Slovenia, Sept. 7-10, 1998, Proceedings, pp. 203-210.
  • Horvat, A., Kljenak, I., “Numerical Investigation of Turbulent Natural Convection in Reactor Pressure Vessel Lower Plenum During Meltdown Scenario”, The 4th Regional Meeting “Nuclear Energy in Central Europe”, Bled, Slovenia, Sept. 7-10, 1997, Proceedings, pp. 43-50.
  • Horvat, A., Marn, J., Leskovar, M., “Mathematical Description of Multiphase Flow During Meltdown Scenario”, The 3rd Regional Meeting “Nuclear Energy in Central Europe”, Portoro_, Slovenia, Sept. 16-19, 1996, Proceedings, pp. 237-245.
  • Marn, J., Leskovar, M., Horvat, A., “Evaluation of Steam Explosion (ESE): Premixing”, The ASME Fluids Engineering Division Summer Meeting 1996, San Diego, California, USA, July 7-11, 1996, Proceedings FED-Vol. 236, pp. 167-172.
  • Horvat, A., Marn, J., “Short Overview of Steam Explosion Phenomena Research”, Kuhljevi dnevi ’95, Radenci, Slovenia, Sept. 21-22, 1995, Proceedings, pp. 167-174.

Invited Lectures

  • Sinai, Y., Horvat, A., “Methods & Development in CFD Modelling of Fire”, 22nd May, 2003, Greenwich University, London.
  • Mavko, B., Parzer, I., Horvat, A., “Recent CAMP Activities in Slovenia”, Fall 2001 CAMP Meeting, Oct. 31st – Nov. 1st, 2001, Alexandria, VA, USA.

Monographs & Other Completed Works

  • Horvat, A., “Calculation of Conjugate Heat Transfer in a Heat Sink Using Volume Averaging Technique (VAT)” M.Sc. Thesis, The Mechanical and Aerospace Engineering Department, University of California, Los Angeles, USA, 2002.
  • Horvat, A., “Modeling of Turbulent Natural Convection in a Fluid with Internal Heat Generation with the Large-Eddy Simulation Method”, Ph.D. Thesis, Faculty of Mathematics and Physics, University of Ljubljana, Slovenia, 2001.
  • Horvat, A., “Modeling of Natural Convection Phenomena in Nuclear Reactor Core Melt”, M.Sc. Thesis, Faculty of Mathematics and Physics, University of Ljubljana, Slovenia, 1998.
  • Horvat, A., “Evolution of Vapor Explosion Theory and Modeling”, Dipl. -Ing. Thesis, Faculty of Mechanical Engineering, University of Maribor, Slovenia, 1995.

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