2 Modelling
Turbulent flows need to be modelled in order to build truly predictive
numerical codes for the design and understanding of many industrial flows
such as those around aircrafts or propellers, in gas turbines, piston
engines or burners. Most numerical tools used for practical calculations
are based on the Reynolds Averaged Navier Stokes (RANS) formulation where
the modelling problem is extremely difficult due to intermittency. Large
Eddy Simulation (LES) avoids this problem since it computes the larger
turbulent eddies and models only the smaller ones. In both approaches, one
need to model subgrid Reynolds stresses and heat fluxes as well as chemical
source terms in the case of turbulent reacting flows. To address the
modelling problem, it is often convenient to rely on reference data coming
from accurate Direct Numerical Simulations (DNS). At CERFACS, the DNS
expertise of the CFD group is used to propose new models for RANS and LES
techniques for both reacting and non-reacting flows. These models are
validated and used in the CERFACS codes presented in chapters
3 and 4. The section is divided in two main
parts: reacting and non-reacting flows.
- Reacting Flows
- DNS for Turbulent combustion (B. Cuenot,
C. Jiménez, A. de Lataillade,
T. Poinsot)
- LES of turbulent combustion (J-P. Légier,
G. Lartigue, L. Selle, K. Truffin,
C. Prière, L. Gicquel, B. Cuenot,
C. Jiménez, F. Ducros, F. Nicoud,
T. Poinsot)
- Reduced kinetics for LES of combustion (K. Truffin,
G. Lartigue)
- Flame/acoustics interactions (A. Kaufmann,
L. Selle, F. Nicoud)
- Flame/wall interaction (F. Dabireau,
A. de Lataillade, B. Cuenot,
T. Poinsot)
- Atmospheric pollution (B. Cuenot,
R. Paoli, F. Laporte, F. Cousin)
- Non-Reacting Flows
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