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T. POINSOT Codes de Combustion - ForeFire API: javascript PDF

108 Pages·2010·2.67 MB·French
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T. POINSOT Codes de Combustion Lundi 31 Mai 2010, 11h00 – 12h30 Codes for combustion T. Poinsot1,2,3, F. Nicoud2, B. Cuenot2, L. Selle1, G. Lartigue2, L. Gicquel2, S. Candel4 and others ! 1IMFT, CNRS, Toulouse France 2/CERFACS, Toulouse France 3CTR, Stanford and NASA Ames 4EM2C, Paris 1 Waves OUTLINE The reacting Navier Stokes equations and the codes to solve them The differences between RANS, DNS and LES Computing vortices and acoustic waves in CFD: simple ? High Performance Computing and combustion 2 Waves Which equations ? Here we will talk only about the compressible reacting Navier Stokes equations. Arrhenius reaction rates but usually reduced chemical schemes. No simplifications using special models (infinitely fast chemistry, flamelet model etc). Acoustics included Full multispecies formulation, no simplification for the state equation, the variable heat capacities 3 AVBP-course Thermodynamics: equation of state A mixture of k= 1 to N perfect gases. Composition characterized by mass fractions Yk=mk/m Molar weight of the mixture with 4 Waves EQUATIONS : compressible reacting Navier Stokes MOMENTUM: Same as usually. Except that viscosity is more difficult to estimate: •  it is a gas mixture with varying composition Yk, k=1 to N •  its temperature changes significantly Viscosity = f(Yk,T) 5 Waves MASS CONSERVATION: one equation for each species k= 1 to N ! = ! *Y is the partial density of species k k k Diffusion Reaction rate 6 Waves ENERGY: Heat flux Reaction rate Radiation THESE EQUATIONS ARE UNFILTERED, INSTANTANEOUS THE MAIN ISSUE IS HOW TO HANDLE TURBULENCE ! 7 Waves Classification générale LAMINAIRE TURBULENT Zéro CHEMKIN: Aurora CHEMKIN: Aurora dimensionnel: T=f(t) Yk=gk(t) Avec méthode pdf PREMELANGE 1D: Codes de recherche Premix COSILAB CODES TURBULENTS Codes de recherche DIFFUSION Oppdiff CHEMKIN 8 C est quoi, un calcul 0D ? Exemple: le temps d’autoallumage 9 Waves

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1 Waves Codes for combustion T. Poinsot1,2,3, F. Nicoud2, B. Cuenot2, L. Selle1, G. Lartigue2, L. Gicquel2, S. Candel4 and others ! 1IMFT, CNRS, Toulouse France
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