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Multiscalar mapping closure for mixing in homogeneous turbulence (1995)

Valiño, Luis

[S.l.] : American Institute of Physics (AIP)

Physics of Fluids 7 (1995), S. 144-152

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A new methodology to use mapping closures for the mixing of several scalars in homogeneous turbulence is explained. The main idea is the unidimensional mapping for each scalar, with the cross-dissipation handled by a joint reference field. A restricted and a general closure are described. A Monte Carlo code based on a fractional step technique has been developed. As an example, the segregated double-delta two-scalar mixing is analytically and numerically solved and predictions are shown. © 1995 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.868735

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Digitale Medien

A Field Monte Carlo Formulation for Calculating the Probability Density Function of a Single Scalar in a Turbulent Flow (1998)

Valiño, Luis

Springer

Flow, turbulence and combustion 60 (1998), S. 157-172

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ISSN: 1573-1987

Schlagwort(e): PDF ; Monte Carlo ; turbulent ; partial stochastic differential

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract The probability density function (PDF) formulation of one scalar field undergoing diffusion, turbulent convection and chemical reaction is restated in terms of stochastic fields. These fields are smooth in space as they have a length scale similar to that of the PDF. Their evolution is described by a set of stochastic partial differential equations, which are solved using a finite volume scheme with a stochastic source term. The application of this methodology to a particular flow is shown first for a linear source term, with exact analytical solution for the mean and standard deviation, and then for a nonlinear reaction.