The prediction of laminarization with a two-equation model of turbulence

Jones, W.P.; Launder, B. E.

doi:10.1016/0017-9310(72)90076-2

Cited by 3,535 publications

(1,367 citation statements)

References 7 publications

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“…Various turbulence models have been developed and validated; see Chen and Jaw (1998) and Wilcox (1998). The 'industry standard' turbulence model is the k-ε model that includes two transport equations for k and ε based on the work of Jones and Launder (1972) and Launder and Spalding (1974), with the constants of Launder and Sharma (1974). The eddy viscosity is calculated as / , where 0.09.…”

Section: Mathematical Formulationmentioning

confidence: 99%

Numerical investigation of VOC levels in the area of petrol stations

Kountouriotis

Aleiferis

Charalambides

2014

Science of The Total Environment

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Section: Mathematical Formulationmentioning

confidence: 99%

Numerical investigation of VOC levels in the area of petrol stations

Kountouriotis

Aleiferis

Charalambides

2014

Science of The Total Environment

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“…However, the impact of chemical reaction on turbulence has attracted The treatment of turbulent kinetic energy dissipation ( ) also merits attention. The "standard" turbulent dissipation rate equation is based on the k´ model [40] formulated for constant-density flows. However, Mura and Champion [41] found that beyond a given value of the Bray number, the turbulent dissipation rate may be controlled by the flamelet structures.…”

Section: Introductionmentioning

confidence: 99%

The impact of dilatation, scrambling, and pressure transport in turbulent premixed flames

Tian

Lindstedt

2017

Combustion Theory and Modelling

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Premixed turbulent flames feature strong interactions between chemical reactions and turbulence that affect scalar and turbulence statistics. The focus of the present work is on clarifying the impact of pressure dilatation/flamelet scrambling effects with a comprehensive second-moment closure used for evaluation purposes. Model extensions that take into account flamelet orientation and molecular diffusion are derived. Isothermal pressure transport is included with an additional variable density contribution derived for the flamelet regime of combustion. The full closure is assessed by comparisons with direct numerical simulations (DNS) of statistically "steady" fully developed premixed turbulent planar flames at different expansion ratios. Subsequently, the prediction of lean premixed turbulent methane-air flames featuring fractal grid generated turbulence in an opposed jet geometry is considered. The overall agreement shows that "dilatation" effects contribute to counter-gradient transport and can also increase the turbulent kinetic energy significantly. Levels of anisotropy are broadly consistent with the DNS data and key aspects of opposed jet flames are well predicted. However, it is also shown that complications arise due to interactions between the imposed pressure gradient and combustion and that redistribution is affected along with the scalar flux at the leading edge. The latter is strongly affected by the reaction rate closure and, potentially, by pressure transport. Overall, the derived models offer significant improvements and can readily be applied to the modelling of premixed turbulent flames at practical rates of heat release.

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“…The use of k-ω model in the inner regions of the boundary layer makes the formulation usable through the viscous sub-layer. To avoid the common problem of k-ω model that the model is too sensitive to the inlet free-stream turbulence properties [19], the SST model switches to k-ε [20] model in the free-stream. However, k-ε model was not able to capture accurately the turbulence of turbulent boundary layers due to separation [21].…”

Section: B the Sst Turbulence Modelmentioning

confidence: 99%

Verification Study of a CFD-RANS Code for Turbulent Flow at High Reynolds Numbers

Musa¹

2016

IJMO

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The prediction of laminarization with a two-equation model of turbulence

Cited by 3,535 publications

References 7 publications

Numerical investigation of VOC levels in the area of petrol stations

Numerical investigation of VOC levels in the area of petrol stations

The impact of dilatation, scrambling, and pressure transport in turbulent premixed flames

Verification Study of a CFD-RANS Code for Turbulent Flow at High Reynolds Numbers

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