Reynolds number effect on wall turbulence: toward effective feedback control

Iwamoto, Kaoru; Suzuki, Yuji; Kasagi, Nobuhide

doi:10.1016/s0142-727x(02)00164-9

Cited by 244 publications

(193 citation statements)

References 28 publications

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“…The results are compared with those obtained by the spectral method (Iwamoto et al 2002;Kasagi et al 1992). Figure 1 shows the computational domain for the channel flow with scalar transfer (with a constant heat flux q w ).…”

Section: Dns Of a Channel Flow With Scalar Transfer: Validation Of Numentioning

confidence: 99%

“…The friction Reynolds number Re τ is 150, which is the same value as that used in Iwamoto et al (2002) and Kasagi et al (1992). The uniform heat flux condition (same as in Kasagi et al 1992) is applied to the lower and upper walls.…”

Section: Flow Conditionsmentioning

confidence: 99%

“…In this chapter, we demonstrate the method for performing DNS of incompressible turbulent flows with scalar transfer around complex geometries. In the first section, we present the results for the canonical channel flow with scalar transfer obtained using our DNS code and compare them with results obtained using the spectral method (Iwamoto et al 2002;Kasagi et al 1992). Then, we describe the numerical methods for the DNS of turbulent fields with scalar transfer around and downstream of regular and fractal grids (Hurst & Vassilicos 2007;Seoud & Vassilicos 2007;Mazellier & Vassilicos 2010) as an example of flow around complex geometries.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Direct Numerical Simulation of Turbulence with Scalar Transfer around Complex Geometries Using the Immersed Boundary Method and Fully Conservative Higher-Order Finite-Difference Schemes

Nagata¹,

Suzuki²,

Sakai³

et al. 2010

Numerical Simulations - Examples and Applications in Computational Fluid Dynamics

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Section: Dns Of a Channel Flow With Scalar Transfer: Validation Of Numentioning

confidence: 99%

Section: Flow Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Direct Numerical Simulation of Turbulence with Scalar Transfer around Complex Geometries Using the Immersed Boundary Method and Fully Conservative Higher-Order Finite-Difference Schemes

Nagata¹,

Suzuki²,

Sakai³

et al. 2010

Numerical Simulations - Examples and Applications in Computational Fluid Dynamics

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“…As a point of reference LES results are compared with the DNS data which are obtained from Ref. [21]. Simulations are conducted using the in-house compressible code FLOWAVE;…”

Section: Channel Flowmentioning

confidence: 99%

Globally conservative high-order filters for large-eddy simulation and computational aero-acoustics

Wu¹,

Meyers²

2011

Computers & Fluids

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In computational aero-acoustics, large-eddy simulations (LES) or direct numerical simulations (DNS) are often employed for flow computations in the source region. As part of the numerical implementation or required modeling, explicit spatial filters are frequently employed. For instance, in LES spatial filters are employed in the formulation of various subgrid-scale (SGS) models such as the dynamic model or the variational multi-scale (VMS) Smagorinsky model; both in LES or DNS, spatial high-pass filters are often used to remove undesired grid-to-grid oscillations.Though these type of spatial filters adhere to local accuracy requirements, in practice, they often destroy global conservation properties in the presence of non-periodic boundaries conditions. This leads to the incorrect prediction of the flow properties near the hard boundaries, such as walls. In the current work, we present globally conservative high-order accurate filters, which combine traditional filters at the internal points with one-sided conservative filters near the wall boundary. We test these filters to remove grid-to-grid oscillations both in a channel-flow case and in 2D cavity flow. We find that the use of a non-conservative filter leads to erroneous predictions of the skin friction in channel flows up to 30%. In the cavity-flow simulations, the use of non-conservative filters to remove grid-to-grid oscillations leads to important shifts in the Strouhal number of the dominant mode, and a change of the flow pattern inside the cavity. In all cases, the use of conservative high-order filter formulations to remove grid-to-grid oscillations lead to very satisfactory results. Finally, in our channel-flow test case, we also illustrate the importance of using conservative filters for the formulation of the VMS Smagorinsky model.

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“…In the log-layer and towards the outer layer the dissipation rate balances the turbulence kinetic energy production. Also shown in the figures are the DNS calculation of turbulence production and dissipation rate in a fully developed channel flow by Iwamoto and Kasagi [20]. The spectral measurement estimate are estimates made using Equation 4.16, while TKE transport equation estimates are estimates obtained by balancing the terms in the kinetic energy transport equation with the dissipation rate.…”

Section: Spectral Measurementsmentioning

confidence: 99%

A Basic Three-Dimensional Turbulent Boundary Layer Experiment to Test Second-Moment Closure Models

Sadek

2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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In this work, a three-dimensional turbulent boundary layer experiment was set up with alternating stream-wise and span-wise pressure gradients. The pressure gradients are generated as a result of the test section wavy side wall shape. Each side had six sine waves with a trough to peak magnitude to wavelength ratio of 0.25. Boundary layer control was used so that the flow over the side walls remains attached. The mean flow velocity components, static and total pressures were measured at six plane along the stream-wise direction. The alternating mean span-wise and stream-wise pressure gradients created alternating stream-wise and span-wise vorticity fluxes, respectively, along the test section. As the flow developed downstream the vorticity created at the tunnel floor and ceiling diffused away from the wall.The vorticity components in the stream-wise and span-wise directions are strengthened due to stretching and tilting terms in the vorticity transport equaitons. The positivez half of the test section contains large areas that generate positive vorticity flux in the trough region and smaller areas generating negative vorticity around the wave peak. The opposite is true for the negative-z half of the test-section. This results in a large positive stream-wise vorticity in the positive-z half and negative stream-wise vorticity in the negative-z half of the test-section. The smaller regions of opposite sign vorticity in each half tend to mix the flow such that as they diffuse away from the wall, the turbulent stresses are more uniform.Turbulent fluctuating velocity components were measured using Laser Doppler Velocimetery. Mean velocities as well as Reynolds stresses and triple velocity component correlations were measured at thirty stations along the last wave in the test section. Profiles at the center of the test section showed three dimensionality, but exhibited high turbulence intensities in the outer layer.Profiles off the test section centerline are highly three dimensional with multiple peaks in the normal stress profiles. The flow also reaches a state where all the normal stresses have equal magnitudes while the shear stresses are non-zero. A turbulent kinetic energy transport budget is performed for all profiles and the turbulence kinetic energy dissipation rate is estimated. Spectral measurements were also made and an independent estimate of the kinetic energy dissipation rate is made. These estimates agree very well with those estimates made by balancing the turbulence kinetic energy transport equation.Multiple turbulent diffusion models are compared to measured quantities. The models varied in agreement with experimental data. However, fair agreement with turbulence kinetic energy turbulent diffusion is observed. A model for the dissipation rate tensor anisotropy is used to extract estimates of the pressure-strain tensor from the Reynolds stress transport equations. The pressure-strain estimates are compared with some of the models in the literature. The comparison showed poor agreement with estimated pr...

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Reynolds number effect on wall turbulence: toward effective feedback control

Cited by 244 publications

References 28 publications

Direct Numerical Simulation of Turbulence with Scalar Transfer around Complex Geometries Using the Immersed Boundary Method and Fully Conservative Higher-Order Finite-Difference Schemes

Direct Numerical Simulation of Turbulence with Scalar Transfer around Complex Geometries Using the Immersed Boundary Method and Fully Conservative Higher-Order Finite-Difference Schemes

Globally conservative high-order filters for large-eddy simulation and computational aero-acoustics

A Basic Three-Dimensional Turbulent Boundary Layer Experiment to Test Second-Moment Closure Models

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