Conditional Moment Closure for Large Eddy Simulations

• DOI: 10.1007/s10494-005-8580-7
• Publication Date: 2005-11-16T14:26:01Z
• Authors: S. Navarro-Martinez; A. Kronenburg; F. Di Mare
• Keywords: Moment closure; Large-Eddy Simulation; Closure (psychology); Turbulent diffusion; Conditional probability distribution; Conditional expectation

A conditional moment closure (CMC) based combustion model for large-eddy simulations (LES) of turbulent reacting flow is proposed and evaluated. Transport equations for the conditionally filtered species are derived that are consistent with the LES formulation and closures are suggested for the modelling of the conditional velocity, conditional scalar dissipation and the fluctuations around the conditional mean. A conventional β-probability density distribution of the scalar is used together with dynamic modelling for the sub-grid fluxes. The model is validated by comparison of simulations with measurements of a piloted, turbulent methane-air jet diffusion flame.