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On Velocity-Conditioned Scalar Mixing In Homogeneous Turbulence, Rodney O. Fox
On Velocity-Conditioned Scalar Mixing In Homogeneous Turbulence, Rodney O. Fox
Rodney O. Fox
Scalar mixing models are required to modelturbulent molecular mixing in full probability density function (pdf) simulations of turbulent reacting flows. Despite the existence of direct numerical simulation (DNS) data suggesting the contrary, most scalar mixing models assume that molecular mixing is independent of the instantaneous velocity, i.e., 〈D∇2φ|V,ψ〉=〈D∇2φ|ψ〉. Since in a joint velocity, composition pdf calculation the velocity is known, this assumption is unnecessary and leads to a lack of local isotropy in the scalar field. Moreover, since velocity conditioning offers a numerically tractable approach for including the effects of local anisotropy and mean velocity gradients on scalar mixing, it …
A Mixing Model To Improve The Pdf Simulation Of Turbulent Diffusion Flames, A. R. Masri, Shankar Subramaniam, S. B. Pope
A Mixing Model To Improve The Pdf Simulation Of Turbulent Diffusion Flames, A. R. Masri, Shankar Subramaniam, S. B. Pope
Shankar Subramaniam
A new mixing model based on Euclidean minimum spanning trees (EMST), which has been developed by Subramaniam and Pope, is used in the PDF simulation of pilot-stabilized turbulent non-premixed flames. a model equation is solved for the joint PDF of velocity composition and turbulence frequency using a particle mesh method.