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  • 1990-1994  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Conditional moment closure for turbulent reacting flow (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 436-444 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Equations governing the variation through the flow field of averages of quantities such as species mass fractions, conditional on mixture fraction, are derived and modeled. The conditioning variable adds to the independent dimensions of the problem, but it is found that this is offset in some cases by reduction in the spatial dimensionality needed. Predictions are made for the reacting scalar mixing layer, and these show good agreement with experiment. The methodology effectively decouples the kinetics from the large inhomogeneity or macromixing aspects of the flow while preserving the input from the scalar dissipation or micromixing. Arbitrarily complex kinetics may be used within reasonable computational cost.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.858867
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  • 2
    Digitale Medien
    Digitale Medien
    A simple theory of conditional mean velocity in turbulent scalar-mixing layer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 605-610 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This paper presents the experimental results on conditional mean transverse velocity across a turbulent scalar mixing layer. The velocity is conditioned on mixture fraction. It is found that the distribution of the conditional mean transverse velocity is closely related to the local mean-mixture fraction in physical space. Near the local mean-mixture fraction a linear relationship exists between the conditional mean transverse velocity and the mixture-fraction fluctuations. Departure from the linear relationship at large mixture-fraction fluctuations is mainly due to the nonlinear distribution of the mean mixture-fraction profile and it is not, as has been suggested by others, due to the limiting velocity of the large eddies in the flow.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.868356
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  • 3
    Digitale Medien
    Digitale Medien
    Measurement and prediction of the conditional variance in a turbulent reactive-scalar mixing layer (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3255-3264 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Equations for the second-order conditional moments of reactive scalars are derived. For one-step reaction with equal diffusivity these can be reduced to a single equation for the conditional variance, which is the same for all reactive species. The various terms in the equation have been modeled in light of the experimental data for a turbulent reactive-scalar mixing layer. In comparison with conventional second-order moment closure the conditional means do not vary with the cross-stream position, the turbulent flux in the cross-stream direction is negligible while the source term needs special attention. Experimental results of the conditional variance at different points across the mixing layer and at various streamwise locations are presented. At each streamwise location the data in general collapse onto each other although the scatter is large. The modeled equations have been solved numerically and are compared with the experimental data. The prediction generally agrees with the data. Two models have been used for the conditional conserved scalar dissipation. One model assumes that the conditional scalar dissipation equals the unconditional one and the other is derived from a mapping closure. Both models give almost identical results for the conditional means and only a small difference for the conditional variance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.858682
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