Results 251 to 260 of about 177,184 (308)

Integration of physiological and remote sensing traits for improved genomic prediction of wheat yield. [PDF]

open access: yesPlant Genome
García-Barrios G   +11 more
europepmc   +1 more source

A Modified Dissipation Equation for Reynolds Stress Turbulent Mixing Models

Journal of Fluids Engineering, 2022
Abstract A simple modification of the dissipation equation is proposed for augmented Reynolds stress models (RSM) devoted to the prediction of buoyancy-driven turbulent mixing at interfaces. It is based on the partition of the kinetic energy into a “directed” large-scale part related to the turbulence mass flux and a “nondirected” small ...
Jérôme Griffond   +2 more
openaire   +1 more source

Modeling of the Reynolds Stress Transport Equation

AIAA Journal, 1997
An empirical strategy for improving modeling of the energy dissipation rate e ij and the velocity-pressure gradient Π ij terms in the transport equations for the Reynolds stresses is proposed on the basis of available direct numerical simulations of the turbulent boundary layer and fully developed turbulent channel flow.
Djenidi, L., Antonia, R. A.
openaire   +2 more sources

Modified Reynolds equation for coupled stress fluids ? a porous media model

Acta Mechanica, 2004
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Li, W.-L., Chu, H.-M.
openaire   +2 more sources

Assessment of Reynolds stress predictions by two-equation turbulence models

15th AIAA Computational Fluid Dynamics Conference, 2001
In this paper, we evaluate the k — e and k — u turbulence models in terms of their accuracy in predicting the Reynolds shear stress in equilibrium boundary layers under arbitrary streamwise pressure gradients. The models are tested against the theoretical formulation of Perry et al.
Krishnendu Sinha   +2 more
openaire   +1 more source

Near-wall two-equation and Reynolds-stress modeling of backstep flow

International Journal of Engineering Science, 1998
Abstract Most near-wall two-equation turbulence models fail to predict the wall shear stress along the step wall of a plane backstep flow and the error could become very large downstream of the reattachment point. This failure was usually attributed to the use of an eddy viscosity damping function that depends on the wall friction velocity and the ...
R.M.C. So, S.P. Yuan
openaire   +1 more source

Closure of the Two-Point Correlation Equation as a Basis for Reynolds Stress Models

Applied Scientific Research, 1993
A closure model for the von Kármán-Howarth equation is introduced. The model holds for a wide range of well accepted turbulence theories for homogeneous isotropic turbulence, as there are Kolmogorov's first and second similarity hypotheses and the invariant theory, which is a generalization of Lojtsyanskij's and Birkhoff's integrals.
Oberlack, M., Peters, N.
openaire   +1 more source

The Reynolds stress transport equations in a momentumless wake - Experiments and models

Fluid Dynamics Conference, 1996
The determination of the transfer terms in the Reynolds stress transport equations is an important issue in the improvement of closure models in turbulence. A part of these efforts is to provide accurate experimental information on each term of these equations and, particularly, on the pressure-strain term.
openaire   +1 more source

Assessment of g-Equation Formulation for a Second-Moment Reynolds Stress Turbulence Model (Invited)

22nd AIAA Computational Fluid Dynamics Conference, 2015
In this work, an alternative formulation for the specific dissipation rate in the Speziale-Sarkar-Gatski / Launder-Reece-Rodi Reynolds stress model is assessed. Here, g=1/omega) is considered as an alternative for ! and the performance of the g-equation is assessed for a range of test cases, which include validation test cases to flows around industry ...
Togiti, Vamshi, Eisfeld, Bernhard
openaire   +1 more source

On the mathematical modeling of the Reynolds stress's equations

28th Aerospace Sciences Meeting, 1990
By considering the Reynolds stress equations as a possible descriptor of complex turbulent fields, pressure-velocity interaction and turbulence dissipation are studied as two of the main physical contributions to Reynolds stress balancing in turbulent flow fields.
openaire   +1 more source

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