1   Introduction

• Modelling. Developing advanced simulation codes requires a knowledge of the physics of the flows and of the models used to represent these flows. In 2000 and 2001, modelling at CERFACS has concentrated on unsteady flows, heat transfer, near-wall turbulence, combustion and two-phase flows.
  
  
• Unsteady Flow Calculations on Unstructured Grids (AVBP). AVBP has become the standard tool for LES of reacting flows at CERFACS but also for CERFACS partners. Laboratories (such as Ecole Centrale Paris, Institut Français du Pétrole, ONERA or Institut de Mécanique des Fluides de Toulouse) have used AVBP for their own research. Industrial partners (SNECMA, Turbomeca, Siemens) have renewed or intensified their collaboration with CERFACS to increase AVBP capabilities. New partners have established collaborations with CERFACS (Alstom Power or SNECMA DMF in Bordeaux for example).
  
  
• Advanced Aerodynamics and Multiphysics. CERFACS leads an intense research activity on structured multi-block codes, both in the classical Fortran framework (with NSMB which is now run routinely at EADS) and in the Object Oriented world (with elsA which is developed jointly with ONERA).
  
  Each sub-group has summarized its main achievements during the last two years in the next pages. General remarks are listed below:
  
  
  • Most European contracts (Framework programme, FP'5) accepted in 2000 have started in 2000 or 2001. These proposals include wake vortices studies (C Wake, S Wake, Wakenet 2), LES of combustion in gas turbines (Icleac, Preccinsta, Molecules), atmospheric pollution (Stopp), Direct Numerical Simulations of partially premixed flames in piston engines (G-level). Additional contracts (Fuelchief, Desire, Awiator) submitted and accepted in 2001 for the last calls of the FP'5 will start in 2002.
    
    
  • The size of the team continues to increase: it gathered 30 persons in January 2001 and more than 40 at the end of 2001. At the same time, many CFD group members have left: B. Caruelle and J.P. Légier have joined Airbus, B. Márquez and J. Cormier went to engineering companies, G. Jonville to the TTN team, O. Colin and A. Benkenida to Institut Français du Pétrole, J. Schlüter to Stanford University. The quality of the research produced by CERFACS seniors was also recognized: Dr Nicoud moved to a professor position in Applied Maths in Montpellier, Dr Schonfeld to the AEA company and Dr Ducros to CEA. The departure of these three seniors has put some additional constraints on the team but confirms the high level of senior scientists trained at CERFACS.
    
    
  • New topics are also beginning as requested by CERFACS partners: for example, in the modelling group, two-phase flow studies have begun in 2000 for EDF in close collaboration with Institut de Mécanique des Fluides de Toulouse. In the field of aerodynamics, the collaboration with ONERA on elsA is growing rapidly: in 2001, six scientists will be working full time on elsA.
    
    
  • In the field of reacting flows, AVBP has been now identified by EADS, SNECMA and Turbomeca as the main french code for unsteady combustion and the national program ``PRC Combustion'' submitted to SPAE has been accepted (in collaboration with ONERA and the major french laboratories working in this field) to develop AVBP for two-phase flow LES applications in the next four years (starting in January 2002).
    
    
  • The collaboration with laboratories continues: in the field of rotating flows, the PhD thesis of L. Kozuch with Ecole Centrale de Lyon will be completed in the first months of 2002 and the collaboration with ENSICA in the Ocmath regional project has also lead to many fruitful interactions. In the field of combustion, AVBP and NTMIX are now used at IMF Toulouse, Ecole Centrale Paris and Institut Français du Pétrole. The CRCT (Centre de Recherche sur la Combustion Turbulente) is very active: CRCT meetings organized in December 2000 (at IFP) and 2001 (at ECP) gathered more than 40 scientists from IMFT, PSA, CERFACS, Ecole Centrale and IFP who collaborate directly or indirectly to CRCT. This collaboration with the academic community also appears through the high level of publications (25 papers in refereed journals in 2000 and 2001) and the presentation of two habilitation thesis in the team in 2000 (Dr F. Nicoud and Dr B. Cuenot). The quality of the formation work at CERFACS was also recognized through the Leopold Escande prize awarded by INP Toulouse to Olivier Colin for his PhD and the first BMW prize awarded to B. Caruelle for the best PhD in 2000 (world contest).
    
    
  • Because of the multiple contracts proposed to the team, it has been decided to transfer studies which do not contain enough fundamental work to the TTN team of CERFACS. This was the case in 2000 for the ASICA project which is now handled by TTN. It also reflects the objective of the team to conserve a high academic level.

Figure 1.1: Dr B. Caruelle receiving his BMW award in Munich for the best PhD work of 2000.