Large scale coherent structures in a turbulent boundary layer interacting with a cylinder wake

Souza, Fenella de; Delville, J.; Lewalle, Jacques; Bonnet, Jean-Paul

doi:10.1016/s0894-1777(99)00022-9

Cited by 19 publications

(5 citation statements)

References 12 publications

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“…Studies on coherent structures in shear layers [15][16][17][18][19][20][21] raised fundamental questions on the applicability the traditionally accepted concepts of gradient transport and eddy diffusivity for mixing and mass transfer analyses. Shear-opposed mixed-convection flow and heat transfer in a narrow, vertical cavity has been presented in the combined experimental and theoretical study in [22].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow

Bhuiyan

Karim

Hart

et al. 2016

Experimental Thermal and Fluid Science

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This study presents the experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow. The flow field dynamics of a cavity type stagnation zone with a length to width ratio of 2 were studied. The cavity was driven by a channel flow with a Reynolds number of 1.8E5. The study utilized flow visualization, laser doppler velocimetry (LDV) and electrical conductivity probe measurements. Measurements of mean velocity and turbulence intensity profiles across the separated flow field showed the development of the shear layer and the recirculating flow pattern in the cavity. The numerical simulations were also performed for comparison with the experimental results considering the solution of the RANS, LES model and two-layer turbulence model. LES produced the formation and dynamics of coherent structures within the separated shear layer. Flow visualization revealed a pulsatile motion in the separated flow region associated with the formation and passage of coherent structures and was supported by measurements of tracer concentration. The study showed how coherent structures in the separated shear layer enhanced the mass transport process from the stagnation zone and how the recirculating flow in the cavity influenced the development of those structures.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow

Bhuiyan

Karim

Hart

et al. 2016

Experimental Thermal and Fluid Science

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“…However, it should be cautious to apply it to general complex three-dimensional flows. Its failure to disturbed turbulent boundary flows has been reported by a number of authors [46][47][48].…”

Section: Reynolds Analogymentioning

confidence: 82%

RANS Modelling of Turbulence in Combustors

Jiang¹

2017

Turbulence Modelling Approaches - Current State, Development Prospects, Applications

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Turbulence modelling is a major issue, affecting the precision of current numerical simulations, particularly for reacting flows. The RANS (Reynolds-averaged Navier-Stokes) modelling of turbulence is necessary in the development of advanced combustion systems in the foreseeable future. Therefore, it is important to understand advantages and limitations of these models. In this chapter, six widely used RANS turbulence models are discussed and validated against a comprehensive experimental database from a model combustor. The results indicate that all six models can catch the flow features; however, various degrees of agreement with the experimental data are found. The Reynolds stress model (RSM) gives the best performance, and the Rk-ε model can provide similar predictions as those from the RSM. The Reynolds analogy used in almost all turbulent reacting flow simulations is also assessed in this chapter and validated against the experimental data. It is found that the turbulent Prandtl/Schmidt number has a significant effect on the temperature field in the combustor. In contrast, its effect on the velocity field is insignificant in the range considered (0.2-0.85). For the present configuration and operating conditions, the optimal turbulent Prandtl/Schmidt number is 0.5, lower than the traditionally used value of 0.6-0.85.

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“…Experimentally, the commonly accepted values of Γ t (∼0.7) are measured from fully developed boundary or pipe flows [1, 2,4-6], and they may not be suitable for practical turbulent reacting flows. Recently a number of authors [27][28][29][30] have experimentally discovered that this idea is no longer applicable to disturbed turbulent thermal boundary flows.…”

Section: Discussionmentioning

confidence: 99%

Prandtl/Schmidt number effect on temperature distribution in a generic combustor

Jiang

Campbell

2009

International Journal of Thermal Sciences

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Large scale coherent structures in a turbulent boundary layer interacting with a cylinder wake

Cited by 19 publications

References 12 publications

Experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow

Experimental and numerical investigation of coherent structure dynamics on mass transfer in a separated cavity flow

RANS Modelling of Turbulence in Combustors

Prandtl/Schmidt number effect on temperature distribution in a generic combustor

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