Les Rencontres Scientifiques d'IFP Energies nouvelles : International Conference on LES for Internal Combustion Engine Flows (LES4ICE)

18-19 November 2010
IFP Energies nouvelles/Rueil-Malmaison

The LES4ICE conference provides a forum for exchange concerning recent advances in Large-Eddy Simulation (LES) research applied to internal combustion engine (ICE) flows and related experimental techniques. By this way, engine designers and research scientists working in the field of ICE, coming from Europe and the USA, gathered to debate the state of the art in LES applied to ICEs and examine advanced experimental techniques capable of supporting and validating its development.
 
A major factor driving R&D in the automotive industry is an increasing demand on the part of our society to reduce CO₂ and pollutant emissions from road vehicles. Although alternative solutions are emerging, the ICE can be expected to remain the dominant energy converter, and it is therefore crucial to further improve its environmental performance. The key to this is being able to move beyond the present state of the art in order to reliably predict and control individual engine cycles under realistic operating conditions, rather than being limited to a cycle-averaged understanding.
 
Today's state of the art in the field of Computational Fluid Dynamics (CFD) applied to ICE flows is based on the Reynolds Averaged Navier-Stokes (RANS) approach. This technique has proven its ability to address cycle-averaged phenomena, making it possible to characterize the dependency of combustion efficiency and emission levels on engine geometry and operating parameters. In terms of the future, however, RANS is limited to steady engine operation, with low levels of cyclic variability.
 
Due to its inherent principle of explicitly resolving large flow scales, which depend of the geometry studied, and of only modelling small scales, which can be assumed to be universal, the use of LES opens up new avenues for extending the scope of application of CFD for ICEs.
A major impetus for this is the continuous development of High Performance Computing (HPC) centers, and their support of LES research and application. The availability of ever better computational power will enable LES to resolve a significant part of the flow kinetic energy, thus potentially improving the prediction of engine aerodynamics and local turbulence conditions. In turn, this will lead to better prediction of liquid injection, mixing, combustion and pollutants, although related phenomena will hardly be resolved on meshes of practical interest, and thus require models that need experimental validation.
 
One of the expected benefits of LES is that it will offer a deeper and more detailed insight into complex coupled phenomena inside the engine, by predicting local instantaneous flow features in spatially filtered, individual engine cycles. This also gives unprecedented access to non-cyclic engine phenomena, such as cyclic variability, knock, cold starts or transients.
 
A central requirement for industrial use of LES in the future will be the availability of dedicated engine experiments capable of supporting the development of LES methodologies by providing reliable data of sufficient quality for validation. In particular, conventional experiments are aimed at providing a cycle-averaged view, while access to a more detailed understanding as envisaged with LES requires cycle-resolved, local and quantitative data. The ability to correlate local measurements with global engine characteristics on a cycle basis is also vital to understanding non-cyclic phenomena.
 
A number of questions still need to be answered before LES can be used on an industrial scale. These include basic modelling issues, appropriate numerical methods, methodology and CPU time issues. It will also be necessary to have access to advanced experimental data for validation. The LES4ICE conference provides its participants with a unique opportunity to keep up with the relevant R&D being conducted worldwide.
 

NEW!

Now available:
- the webcasts of the LES4ICE conference (depending on authors authorization) including the animations
- the extended abstracts of the oral presentations
 
Register on-line through http://ifp.illipack.com to take advantage of the talks, the Q&A sessions and download the documents given out on site to all participants.

Presentation files in PDF format can be downloaded from the links on the following final program:
 
 

• Welcome address by X. Montagne, Deputy Director - Scientific Division (IFP Energies nouvelles, France) (

  PDF - 450 Ko

  )
  
   
   

Session 1 - Engine aerodynamics

Chairmen: Gilles Bruneaux (IFP Energies nouvelles, France) and Lyle Pickett (Sandia, USA)
 

• Keynote address: In-cycle structure and cycle to cycle variability of a tumbling flow. What can we learn from high speed PIV? - unavailable -
  J. Borée (Institut Pprime, France, in collaboration with Renault SAS)
   

• Development and validation of a new LES turbulence model for wall-bounded flows (

  PDF - 1.9 Mo

  )
  
  H. Baya Toda¹, K. Truffin¹, G. Bruneaux¹, O. Cabrit², F. Nicoud² (1 IFP Energies nouvelles, 2 i3M, France)
   
• Development and assessment of POD for analysis of turbulent flow in piston engines (

  PDF - 960 Ko

  )
  
  K. Liu, D. C. Haworth (Pennsylvania State Univ., USA)
   

• A strategy for evaluation of LES applied to diesel engine in-cylinder flow - joint effort of simulation and experimental PIV flow analysis - available soon -
  E. Brußies¹, V. Neubert¹, G. Bittlinger¹, J. Janicka², A. Dreizler², W. Bauer³ (1 Robert Bosch, 2 TU Darmstadt, 3 ANSYS, Germany)
   

• LES of the flow in a DISI engine: analysis of turbulent scalar - velocity correlations - available soon -
  F. di Mare¹, D. Goryntsev², J. Janicka² (1 DLR, 2 TU Darmstadt, Germany))
   
• Characterisation of cyclic variability in an optically accessible IC engine by means of phase-independent POD - unavailable -
  B. Boehm¹, F. di Mare², A. Dreizler¹ (1 TU Darmstadt, 2 DLR, Germany)
   
• A common engine platform for engine LES development and validation (

  PDF - 1.7 Mo

  )
  
  V. Sick¹, D. Reuss¹, C. Rutland², D. Haworth³, J. Oefelein⁴, J. Janicka⁵, T.-W. Kuo⁵, X. Yang⁵, M. Freitag⁶ (1 Univ. of Michigan, 2 Univ. of Wisconsin, 3 Pennsylvania State Univ., 4 Sandia National Lab., USA; 5 TU Darmstadt, Germany; 6 General Motors, USA)
   
   

Session 2 - Engine combustion

Chairmen: Sébastien Candel (École Centrale Paris, France) and Dan Haworth (Pennsylvania State Univ., USA)
 

• Keynote address: Numerical experiments using DNS of turbulent flames at high Reynolds numbers - available soon -
  D. Thévenin (Univ. of Magdeburg, Germany)
   

• LES of a growing turbulent premixed flame kernel using a dynamic flame surface density model (

  PDF - 5 Mo

  )
  
  G. Wang¹, M. Boileau¹, D. Veynante¹, K. Truffin² (1 École Centrale Paris, 2 IFP Energies nouvelles, France)
   
• LES of a spark-ignition engine using different combustion models (

  PDF - 900 Ko

  )
  
  F. Magagnato (Univ. Karlsruhe, Germany)
   

• Evolutions of the ECFM-LES model for premixed combustion and applications to spark-ignited engines (

  PDF - 2.7 Mo

  )
  
  K. Truffin, S. Richard, O. Colin, O. Laget, B. Réveillé (IFP Energies nouvelles, France)
   

• LES of turbulent combustion in a spark assisted homogenous charge compression ignition engine (

  PDF - 980 Ko

  )
  
  T. Joelsson, R. Yu, X.-S. Bai (Lund Univ., Sweden)
   
• Using LES to quantify and analyse cycle-to-cycle variability in spark-ignition engine (PDF - 40 Mo)
  V. Granet^1,2, B. Enaux^1,3, O. Vermorel¹, V. Dugue², L. Thobois³, T. Poinsot⁴ (1 CERFACS, 2 Renault SAS, 3 PSA Peugeot Citroën, 4 Institut de Mécanique des Fluides de Toulouse, France)
   
• Development of chemical kinetics tabulation method for the prediction of diesel engine pollutants (

  PDF - 14 Mo

  )
  D.-E. Tudorache^1,2, P. Auzillon¹, L. Thobois², N. Darabiha¹, R. Vicquelin¹, O. Gicquel¹, B. Fiorina¹ (1 École Centrale Paris, 2 PSA Peugeot Citroën, France)
   
• A LES-CMC method for the numerical simulation of diesel engine combustion (

  PDF - 2.9 Mo

  )
  F. Bottone¹, A. Kronenburg², D. Gosman¹, A.-J. Marquis¹ (1 Imperial College London, UK; 2 ITV Stuttgart, Germany)
   
   

Session 3 - LES modelling of sprays

Chairmen: Bizhan Befrui (Delphi, Luxemburg) and Chawki Habchi (IFP Energies nouvelles, France)
 

• Keynote address: Stochastic models of atomizing sprays; coupling with LES - available soon -
  M. Gorokhovski (École Centrale Lyon, France)
   

• Numerical study of primary break-up of liquid jets: LES and instability analysis
  S.-K. Kannan, B. Peters (Univ. of Luxemburg, Luxemburg)
   
• Scalar dissipation rate and spray source term modelling for IC Engine LES (

  PDF - 1.7 Mo

  )
  
  C. Rutland (Univ. of Wisconsin, USA)
   

• LES predictions of the vortical flow structures in diesel injector nozzles (

  PDF - 2.6 Mo

  )
  
  M. Gavaises, A. Theodorakakos, D. Papoulias (City Univ. London, UK)
   

• Eulerian-Eulerian and Eulerian-Lagrangian LES of diesel sprays (

  PDF - 1.7 Mo

  )
  
  L. Martinez, A. Vié, C. Habchi (IFP Energies nouvelles, France)
   
• Comparison of diesel spray combustion in different high-temperature, high-pressure facilities - available soon -
  L. M. Pickett¹, C. L. Genzale¹, G. Bruneaux², L.-M. Malbec², L. Hermant², C. Christiansen³ (1 Sandia National Lab., USA; 2 IFP Energies nouvelles, France; 3 TU Denmark, Denmark)
   
   

Session 4 - Applying LES to engine sprays

Chairmen: Chris Rutland (Univ. of Wisconsin, USA)
 

• Keynote address: The role of unsteadiness and coherent structures in the internal flow of automotive injectors: LES improving the understanding of the atomisation generation - available soon -
  J. Hélie (Continental, France)
   

• LES of fuel injection nozzles in cold start conditions (

  PDF - 2.1 Mo

  )
  
  R. Payri, F.-J. Salvador, J. Gimeno, G. Bracho (CMT, Spain)
   
• LES and optical studies of GDi pulsed liquid jets - unavailable -
  B. Befrui, G. Corbinelli (Delphi, Luxemburg)
   

Scientific correspondent

Dr. Christian Angelberger
IFP, Rueil-Malmaison, France
Tel: +33 1 47 52 57 45
Fax: +33 1 47 52 70 68
E-mail: christian.angelberger@ifpenergiesnouvelles.fr
 

Scientific committee

- Dr. P. Adomeit (FEV Motorentechnik, Germany)
- Dr. T. Baritaud (Ferrari, Italy)
- Pr. K. Boulouchos (ETH Zürich, Switzerland)
- Pr. S. Candel (École Centrale Paris, France)
- Pr. A. D. Gosman (Imperial College London, UK)
- Dr. C. Habchi (IFP Energies nouvelles, France)
- Pr. D. Haworth (Pennsylvania State Univ., USA)
- Pr. J. Janicka (TU Darmstadt, Germany)
- Dr. C. Krüger (Daimler, Germany)
- Dr. T. W. Kuo (GM Global R&D, USA)
- Pr. N. Peters (RWTH Aachen, Germany)
- Pr. T. J. Poinsot (Institut de Mécanique des Fluides de Toulouse, France)
- Dr. F. Ravet (Renault, France)
- Pr. C. Rutland (University of Wisconsin-Madison, USA)
- Pr. D. Thévenin (University Magdeburg, Germany)
- Dr. P. Trouillet (PSA Peugeot Citroën, France)
- Dr.-Ing. T. Unger (Dr. Ing. h.c. F. Porsche AG, Germany)