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Scalar PDF and velocity-scalar PDF modelling of the bluff-body stabilised flame HM1 using ILDM

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1330
pages 621-624

Bertrand Naud
Modeling and Numerical Simulation Group, Energy Dept., Ciemat, Avda. Complutense 22, 28040 Madrid, Spain

Bart Merci
Department of Mechanics of Flow, Heat and Combustion, Ghent University, St-Pietersnieuwstraat 41, 9000 Gent; and Postdoctoral Fellow of the Fund of Scientific Research - Flanders,Belgium

Dirk J.E.M. Roekaerts
Department Process and Energy, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft ; Department of Multi-Scale Physics, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft

D. Schmidt
Institute for Internal Combustion Engines and Automotive Engineering, University of Stuttgart, Pfaffenwaldring 12, D-70569 Stuttgart, Germany

Ulrich Maas
Institute for Technical Thermodynamics, Karlsruhe University (TH), Kaiserstraβe 12, 76131 Karlsruhe, Germany

Abstract

Velocity-scalar and scalar PDF results are compared for the bluff-body stabilised flame HM1 using ILDM chemistry based on mixture fraction, and CO2 and H2O mass fractions. The same Reynolds stress turbulence model and the same modified Curl mixing model are used. No effect of radiative heat loss is included. The results for mean velocity and Reynolds stresses are satisfactory and very similar for both calculations. Each PDF modelling approach implies a different closure for the velocity-scalar correlation. In the present calculations this leads to significant differences in the radial profiles of mean scalars and of mixture fraction variance (different scalar flux modelling): velocity-scalar PDF results (differential scalar flux model) are better than scalar PDF results (gradient diffusion). Results in composition space (scatter plots) confirm the higher quality of the velocity-scalar PDF.

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