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Digitale Medien

Prediction of turbulent free shear flow statistics using a simple stochastic model (2000)

Kerstein, Alan R. ; Dreeben, Thomas D.

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

Physics of Fluids 12 (2000), S. 418-424

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: One-dimensional turbulence, a stochastic simulation of turbulent flow evolution based on application of a mixing-length-type hypothesis to individual turbulent eddies, is used to predict transverse profiles of single-point statistics up to third order for two time-developing planar free shear flows, a mixing layer and a wake. Comparison of computed results to statistics obtained from direct numerical simulations of these flows indicates that the model, despite its simplicity, captures important features of turbulent free shear flow structure. Implications concerning the possible universality of some aspects of turbulent shear flow are discussed. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.870319

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2

Digitale Medien

Wall-function treatment in pdf methods for turbulent flows (1997)

Dreeben, Thomas D. ; Pope, Stephen B.

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

Physics of Fluids 9 (1997), S. 2692-2703

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: A wall-function boundary condition is developed for the pdf/Monte Carlo method. Like traditional wall functions, this reproduces the logarithmic velocity profile and shear stress in equilibrium flow conditions. A constant-stress analysis for the pdf, and a linear-stress analysis for the first two moments of the pdf are developed as the basis for this wall-function approach. Stable and accurate boundary conditions are derived and demonstrated with fully-developed channel flow.© 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.869381

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3

Digitale Medien

Probability density function and Reynolds-stress modeling of near-wall turbulent flows (1997)

Dreeben, Thomas D. ; Pope, Stephen B.

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

Physics of Fluids 9 (1997), S. 154-163

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ISSN: 1089-7666

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Probability density function (pdf) methods are extended to include modeling of wall-bounded turbulent flows. A pdf near-wall model is developed in which the generalized Langevin model is combined with an exact model for viscous transport. Then the method of elliptic relaxation is used to incorporate the wall effects without the use of wall functions or damping functions. Information about the proximity of the wall is provided only in the boundary conditions so that the model can be implemented without ad hoc assumptions about the geometry of the flow. A Reynolds-stress closure is derived from this pdf model, and its predictions are compared with DNS and experimental results for fully developed turbulent channel flow. © 1997 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.869157

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