Results 11 to 20 of about 177,184 (308)

Turbulence Modeling for Physics-Informed Neural Networks: Comparison of Different RANS Models for the Backward-Facing Step Flow

Fluids, 2023
Physics-informed neural networks (PINN) can be used to predict flow fields with a minimum of simulated or measured training data. As most technical flows are turbulent, PINNs based on the Reynolds-averaged Navier–Stokes (RANS) equations incorporating a ...
Fabian Pioch, Jan Hauke Harmening, Andreas Maximilian Müller, Franz-Josef Peitzmann, Dieter Schramm, Ould el Moctar   +5 more
doaj   +1 more source

Simulations of the Rotor-Stator-Cavity Flow in Liquid-Floating Rotor Micro Gyroscope

Micromachines, 2023
When rotating at a high speed in a microscale flow field in confined spaces, rotors are subject to a complex flow due to the joint effect of the centrifugal force, hindering of the stationary cavity and the scale effect.
Chunze Wang, Rui Feng, Yao Chu, Qing Tan, Chaoyang Xing, Fei Tang   +5 more
doaj   +1 more source

Las ecuaciones de Reynolds y la relación de clausura

Revista de Matemática: Teoría y Aplicaciones, 2009
We posed the problem to obtain the closure relation for the Reynolds equations. And like secondary target, to obtain analytical expressions for the Reynolds stress. Showing its jump of discontinuity like expression of the rupture of the symmetry; the one
José Roberto Mercado Escalante
doaj   +1 more source

Numerical Study of Low Pr Flow in a Bare 19-Rod Bundle Based on an Advanced Turbulent Heat Transfer Model

Frontiers in Energy Research, 2022
Compared to assuming a constant turbulent Prandtl number model, an advanced four-equation model has the potential to improve the numerical heat transfer calculation accuracy of low–Prandtl number (Pr) fluids.
Xianwen Li, Xianwen Li, Xingkang Su, Xingkang Su, Long Gu, Long Gu, Long Gu, Lu Zhang, Xin Sheng   +8 more
doaj   +1 more source

New reynolds equation for line contact based on the carreau model modification by bair [PDF]

, 2012
This paper presents a new form of the one-dimensional Reynolds equation for lubricants whose rheological behaviour follows a modified Carreau rheological model proposed by Bair.
A. Díaz Lantada, Abramowitz, Bair, Bair, Bair, Bair, Bair, Carreau, Chapkov, Dowson, E. Chacón Tanarro, E. de la Guerra Ochoa, Ehret, Greenwood, Holmes, J. Echávarri Otero, J.L. Muñoz Sanz, J.M. Munoz-Guijosa, Kim, Kumar, Lin, Liu, P. Lafont Morgado, Sharif, Tao, Tao   +25 more
core   +2 more sources

Assessment of Turbulence Models in a Hypersonic Cold-Wall Turbulent Boundary Layer

Fluids, 2019
In this study, the ability of standard one- or two-equation turbulence models to predict mean and turbulence profiles, the Reynolds stress, and the turbulent heat flux in hypersonic cold-wall boundary-layer applications is investigated.
Junji Huang, Jorge-Valentino Bretzke, Lian Duan   +2 more
doaj   +1 more source

Modeling of the flow and heat exchange in pipes with turbulators of viscous heat carriers in the laminar region, as well as in the transition to turbulent flow

Вестник Дагестанского государственного технического университета: Технические науки, 2023
Objective. Mathematical modeling of heat transfer in pipes with turbulators for viscous heat carriers at Reynolds numbers characteristic of laminar and transient flow regimes is carried out by the calculation method.
I. E. Lobanov
doaj   +1 more source

Application of Different Turbulence Models Simulating Wind Flow in Complex Terrain: A Case Study for the WindForS Test Site

Computation, 2018
A model for the simulation of wind flow in complex terrain is presented based on the Reynolds averaged Navier–Stokes (RANS) equations. For the description of turbulence, the standard k-ε, the renormalization group (RNG) k-ε, and a ...
Hermann Knaus, Martin Hofsäß, Alexander Rautenberg, Jens Bange   +3 more
doaj   +1 more source

Model Development for Dissipation Terms in Reynolds Stress Equations.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1994
This paper presents an anisotropic dissipation term modeling for the Reynolds stress transport equation, and presents a comparison with Direct Numerical Simulation (DNS) data for three different flow systems. In the present model, the anisotropic tensor of the dissipation term is evaluated using three algebraic expressions, eSij, eRij and eWij.
Hiroyuki Yoshida, Akihiko Shimizu
openaire   +2 more sources

Shear flow generation by Reynolds stress and suppression of resistive g modes [PDF]

, 1994
Suppression of resistive g-mode turbulence by background shear flow generated from a small external flow source and amplified by the fluctuation-induced Reynolds stress is demonstrated and analyzed. The model leads to a paradigm for the low-to-high (L?H)
H. Sugama, W. Horton
core   +2 more sources