Results 11 to 20 of about 441,780 (278)
Reynolds number effects on the Reynolds-stress budgets in turbulent channels [PDF]
Physics of Fluids, 2008 Budgets for the nonzero components of the Reynolds-stress tensor are presented for numerical channels with Reynolds numbers in the range Reτ=180–2000. The scaling of the different terms is discussed, both above and within the buffer and viscous layers. Above x2+≈150, most budget components scale reasonably well with uτ3/h, but the scaling with uτ4/ν is
Hoyas, Sergio, Jiménez Sendín, Javier
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Joint statistics between velocity-gradient and fluctuating pressure in a turbulent planar jet
Nihon Kikai Gakkai ronbunshu, 2017 Joint statistics between velocity gradient and fluctuating static pressure in a turbulent planar jet are experimentally investigated. The experimental data was acquired by simultaneous measurements of velocity gradient ( ∂u’2/∂x1 and ∂u’1/∂x2, where u’1,
Mamoru TAKAHASHI +3 more
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AIP Advances, 2022 To improve the prediction accuracy of separated flow based on the Reynolds Averaged Navier–Stokes model, the model constants of the baseline Reynolds stress model are calibrated by the ensemble Kalman filter data assimilation method.
Xiliang Song +3 more
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Coastal Engineering 1984, 1984 The on-offshore and the vertical components u, w of the velocity in a surf zone on a uniformly sloping beach in a wave tank were measured simultaneously with a laser-doppler velocimeter under two conditions. The time variation of the Reynolds stress -u'w' during one wave period is discussed.
T. Sakai, I. Sandanbata, M. Uchida
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Journal of Fluid Science and Technology, 2023 In this study, the liquid film thickness of slug flow in a microchannel was numerically investigated. Particularly, we focused on a flow regime with high Reynolds and capillary numbers; these dimensionless number were independently modified to ...
Daisuke TSUNEOKA, Junnosuke OKAJIMA
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Numerical simulation of grid-generated turbulent particulate flow by three-dimensional Reynolds stress; pp. 161–174 [PDF]
Proceedings of the Estonian Academy of Sciences, 2013 A three-dimensional (3D) Reynolds stress turbulence model based on 3D Reynolds-averaged NavierâStokes equations has been elaborated for grid-generated turbulence in particulate downward flow arranged in the channel domain of the square cross section ...
Alexander Kartushinsky +6 more
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Inertial Effects on the Stress Generation of Active Fluids [PDF]
, 2017 Suspensions of self-propelled bodies generate a unique mechanical stress owing to their motility that impacts their large-scale collective behavior. For microswimmers suspended in a fluid with negligible particle inertia, we have shown that the virial ...
Brady, John F., Takatori, Sho C.
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Realizability of Reynolds-stress turbulence models [PDF]
The Physics of Fluids, 1977 It is shown that certain existing phenomenological models of turbulence in terms of differential equations for the Reynolds stresses Rαβ=〈u′α u′β〉 do not guarantee realizable solutions. The known realizability conditions are Rαβ⩾0 for α=β and Rαβ2⩾Rαα Rββ for α≠β. A stronger requirement is that the matrix Rαβ be positive semi-definite.
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Length-Scale Correction for Reynolds Stress Modeling [PDF]
AIAA Aviation 2019 Forum, 2019 A length-scale correction term is developed for the SSG/LRR-! Reynolds-stress model that is based on an analysis of the Yap correction. The model with and without the correction is implemented into two flow solvers and applied to four flows featuring separation.
Eisfeld, Bernhard, Rumsey, Christopher
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Journal of Hydrology and Hydromechanics, 2015 Field observations showed that in many gravel-bed rivers, rice stems and gravel interact with each other and affect the flow structure. This calls to conduct research in more details in laboratory to better understand impacts of interaction between rice ...
Fazel Najafabadi Elham +2 more
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