THERMAL SCIENCE

International Scientific Journal

Zoran S. Jovanović

,

Branislav S. Basara

,

Miroljub V. Tomić

,

Velimir S. Petrović

SOME SUBTLETIES CONCERNING FLUID FLOW AND TURBULENCE MODELING IN 4.-VALVE ENGINES

ABSTRACT
In this paper some results concerning the structure and evolution of fluid flow pattern during induction and compression in 4.- valve engines with tilted valves were presented. Results were obtained by dint of multidimensional modeling of non-reactive flows in arbitrary geometry with moving boundaries. During induction fluid flow pattern was characterized with organized tumble motion followed by small but clearly legible deterioration in the vicinity of BDC. During compression the fluid flow pattern is entirely three-dimensional and fully controlled by vortex motion located in the central part of the chamber. In order to annihilate negative effects of tumble deterioration and to enhance swirling motion one of the intake valves was deactivated. Some positive and negative effects of such attempt were elucidated. The effect of turbulence model alteration in the case of excessive macro flows was tackled as well. Namely, some results obtained with eddy-viscosity model i.e. standard k-ε model were compared with results obtained with k-ξ-f model of turbulence in domain of 4.-valve engine in-cylinder flow. Some interesting results emerged rendering impetus for further quest in the near future.
KEYWORDS
4-valve engines, automotive flows, turbulence modelling
PAPER SUBMITTED: 2011-08-25
PAPER REVISED: 2011-08-31
PAPER ACCEPTED: 2011-09-19
DOI REFERENCE: https://doi.org/10.2298/TSCI110825104J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Issue 4, PAGES [1065 - 1079]
REFERENCES
  1. J. Danneman, K. Pielhop, M. Klaas, W. Schroeder (2010) „Cycle resolved multi planar flow measurements in a four valve combustion engine", Exp.Fluids, Research article, DOI 10.1007/s00348-010-0963-4
  2. Z. Jovanovic, S. Petrovic "The mutual interaction between squish and swirl in IC Engines", (1997) Mobility and Vehicle Mechanics 23, 3, 72-86
  3. K. Lee, C. Bae, K. Kang, The effects of tumble and swirl flows on flame propagation in a fourvalve SI engine, Applied Thermal Engineering vol.27, issues 11-12, (2007) pp.2122-2130
  4. G. J. Micklow, W. D. Gong, Intake and in cylinder flow field modeling of a four valve diesel engine, Proceedings Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, (2007) vol. 221, No.11, pp.1425-1440
  5. B. Khaligi "Intake generated swirl and tumble motion in a 4.-valve engine with various intake configurations" SAE Paper 900059
  6. Z.Jovanovic, S. Petrovic, M. Tomic "The effect of combustion chamber geometry layout on combustion and emission" (2008) Thermal Science vol.12, No.1, pp. 7-24
  7. Z. Jovanovic, Z.Masonicic, M. Tomic „The vice-verse movement of the reverse tumble center of rotation in a particular combustion chamber", MTM, International Virtual Journal for science, technics and innovation for the industry, Year II, issue 6-7, (2008) ISSN 1313-0226l, pp. 17-20
  8. Z. Masonicic, Z. Jovanovic "The effect of combustion chamber geometry layout variations onto fluid flow pattern", International Automotive Conference with Exhibition, SCIENCE AND MOTOR VEHICLES, NMV0774, Belgrade, 2007, ISBN 978-86-80941-31-8
  9. Z.Jovanovic "The role of tensor calculus in numerical modeling of combustion in IC engines" Computer Simulation in Fluid Flow, Heat and Mass Transfer and Combustion in Reciprocating Engines, Hemisphere Publishers (1989) 457-542, ISBN 0-89116-392-1
  10. A. A. Amsden, KIVAII: A computer program for chemically reactive flows with sprays, LA- 11560-MS,1989
  11. A. A. Amsden, KIVA3V, Rel.2 Improvements to KIVA3V, LA-UR-99-915, 1999
  12. A. A. Amsden, SALE3D: A simplified ALE computer program for calculating 3D fluid flows, NUREG-CR-2185, 1982, 11560-MS, 1989
  13. S. I. Yang, Y. K. Siow, C. Y. Teo, K. Hanjalic, A KIVA code with Reynolds stress model for engine flow simulation, Energy, vol. 30, issue 2-4 (2005), pp.437-445
  14. D. J. Torres, M. F. Trujillo, KIVA-4: An unstructured ALE code for compressible gas flow with sprays, Journal of Computational Physics, vol.219, issue 2, (2006), pp.943-975
  15. CFD Solver, AVL FIRE 2009.1
  16. C. G. Speciale, S. Sarkar, T. B. Gatski „Modelling the pressure strain correlation of turbulence - an invariant dynamical system approach", pp.1-51, ICASE Report No. 90-5, 1990
  17. K. Hanjalic, M. Popovac, M. Hadjiabdic, A robust near-wall elliptic relaxation eddy viscosity turbulence model for CFD, International Journal of Heat and Fluid Flow, vol. 25, issue 6, (2004), pp.1047-1051
  18. P. A. Durbin, Near wall turbulence closure modeling without damping functions, Theoretical Computational Fluid Dynamics, volume 3, Number 1, (1991), pp.1-13
  19. B.Hanjalic "Blending the RANS and LES concepts for computing industrial and environmental flows: a perspective", International Automotive Conference with Exhibition, SCIENCE AND MOTOR VEHICLES, NMV11AutoSim01, Belgrade, 2011, ISBN 978-86-80941-36-3
  20. B. Basara, Z. Pavlovic "PANS vs. RANS for computation of the flow through intake engine ports", International Automotive Conference with Exhibition, SCIENCE AND MOTOR VEHICLES, NMV11AutoSim09, Belgrade, 2011, ISBN 978-86-80941-36-3
  21. M. Popovac, K. Hanjalic, Compound wall treatment for RANS computation of complex turbulent flows and heat transfer, Flow, Turbulence and Combustion, vol. 27, issue 2, (2007) 78:177-202
  22. Z. Jovanovic, B. Basara „The controversy concerning turbulence modeling in automotive application", M13, PCO Global Conf., Borneo, Malaysia, ISBN 978-983-44483-32
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Some subtleties concerning fluid flow and turbulence modeling in 4.-valve engines

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