An improved mixing model providing joint statistics of scalar and scalar dissipation

Journal Article · Sat Nov 15 00:00:00 EST 2008 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2008.07.002· OSTI ID:21116125

Meyer, Daniel W ^[1]; Jenny, Patrick ^[2]

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1. Department of Energy Resources Engineering, Stanford University, Stanford, CA (United States)
2. Institute of Fluid Dynamics, ETH Zurich (Switzerland)

For the calculation of nonpremixed turbulent flames with thin reaction zones the joint probability density function (PDF) of the mixture fraction and its dissipation rate plays an important role. The corresponding PDF transport equation involves a mixing model for the closure of the molecular mixing term. Here, the parameterized scalar profile (PSP) mixing model is extended to provide the required joint statistics. Model predictions are validated using direct numerical simulation (DNS) data of a passive scalar mixing in a statistically homogeneous turbulent flow. Comparisons between the DNS and the model predictions are provided, which involve different initial scalar-field lengthscales. (author)

• OSTI ID: 21116125
• Journal Information: Combustion and Flame, Vol. 155, Issue 3; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
MIXING
SCALARS
STATISTICS
JOINTS
PROBABILITY DENSITY FUNCTIONS
VALIDATION
TRANSPORT THEORY
TURBULENT FLOW
MATHEMATICAL MODELS
MIXTURES
SCALAR FIELDS
FLAMES
COMPUTERIZED SIMULATION
Mixing model
Scalar dissipation rate
Flamelets
Micromixing