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A multiple mapping conditioning model for differential diffusion
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DOI：10.1063/1.4864101.png)
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Abstract
En 中文
This work introduces modeling of differential diffusion within the multiple mapping conditioning (MMC) turbulent mixing and combustion framework. The effect of differential diffusion on scalar variance decay is analyzed and, following a number of publications, is found to scale as Re-1/2. The ability to model the differential decay rates is the most important aim of practical differential diffusion models, and here this is achieved in MMC by introducing what is called the side-stepping method. The approach is practical and, as it does not involve an increase in the number of MMC reference variables, economical. In addition we also investigate the modeling of a more refined and difficult to reproduce differential diffusion effect - the loss of correlation between the different scalars. For this we develop an alternative MMC model with two reference variables but which also makes use of the side-stepping method. The new models are successfully validated against DNS results available in literature for homogenous, isotropic two scalar mixing. (C) 2014 AIP Publishing LLC.
Keywords:
RAMAN-SCATTERING MEASUREMENTS
PROBABILITY DENSITY-FUNCTION
MOLECULAR-DIFFUSION
PASSIVE SCALARS
TURBULENT
FLAMES
SIMULATIONS
TEMPERATURE
FORMULATION
COMBUSTION
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