Physical Fluid Dynamics

Tritton, D. J.

doi:10.1007/978-94-009-9992-3

Cited by 1,036 publications

(901 citation statements)

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“…Introducing mean flow and fluctuating quantities into the Navier-Stokes equations yields the Reynolds equations for turbulent flow (see Versteeg & Malalasekera, 2007). The two-equation models investigated here use the Boussinesq approximation, which relates the Reynolds stresses to the mean rates of deformation (Tritton, 1977).…”

Section: Turbulence Models and Numerical Implementationmentioning

confidence: 99%

Accuracy and comparison of standard k-ϵ with two variants of k-ω turbulence models in fluvial applications

Farhadi

Mayrhofer

Tritthart

et al. 2017

Engineering Applications of Computational Fluid Mechanics

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Racetrack flumes are established experimental settings in ecohydraulics and sediment studies. Their experimental results are often coupled with numerical simulations. The two-equation turbulence closures of the Reynolds-Averaged Navier-Stokes equations are applied widely in such engineering applications. They are preferred for their ease of use and low computational costs compared with more sophisticated turbulence models involving large-scale fluvial simulations. Here, three variants of two-equation models, i.e. the standard k-ε model and two variants of k-ω models, were applied to tackle mean flow and turbulence in a racetrack flume and a river reach. Regarding model performances, we found an overall reasonable agreement between simulated and measured mean velocity values. Nonetheless, the simulated turbulent kinetic energy exhibited discrepancies to the measured values. The computational costs of all investigated model variants are comparable. Therefore, there is no significant preference among models. The findings confirm the application of these model approaches for mean flow-related investigations (e.g. habitat modeling) but suggest exercising caution for applications sensitive to turbulent processes. ARTICLE HISTORY

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Section: Turbulence Models and Numerical Implementationmentioning

confidence: 99%

Accuracy and comparison of standard k-ϵ with two variants of k-ω turbulence models in fluvial applications

Farhadi

Mayrhofer

Tritthart

et al. 2017

Engineering Applications of Computational Fluid Mechanics

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“…The PIV measurements have also been used to calculate vorticity fields, which corresponds to the changing orientation in space of a fluid particle [27]. In the present study these quantities are used to visualize and to quan- tify the large coherent motions occurring in the mixing layer between the dead-water zone and main stream.…”

Section: Applicationmentioning

confidence: 99%

Large scale PIV-measurements at the surface of shallow water flows

Weitbrecht

Kühn

Jirka

2002

Flow Measurement and Instrumentation

123

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“…Kj,95.30.Qd It is well known that the interaction of a flow with a non-moving bluff body results in a so called Kármán vortex street, where vortices with opposite vorticity are periodically generated alternating from either side of the blunt body in the downstream region, e.g. [1,2]. The phenomenon of periodic shedding of hydrodynamic vortices has many consequences in oceanography, atmospheric physics and engineering.…”

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confidence: 99%

“…However, the results obtained can be easily applied to other relevant plasma systems by straightforward renormalisation. Equations (1)(2)(3)(4)(5) are numerically solved with the use of the Lagrangian-remap code Lare2d [15]. In our studies we simulate the plasma dynamics in a domain …”

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confidence: 99%