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turbulent boundary layers

High reynolds numbers turbulent boundary layers

High reynolds numbers turbulent boundary layers

... Chapter 4 Two-point statistics ∗ 4.1 Introduction The presence of large-scale motions in wall-bounded flows has received considerable attention since the late fifties, when Townsend 177 and Grant 48 realized that the ...

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Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers

Kinematic and Acoustic Similarities of Separated Turbulent Boundary Layers

... separated turbulent boundary layers as a function of the outer flow parameters, the velocity associated with the maximum local mean shear U m = pτ m /ρ, and the reduced wall-normal ...the ...

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Flow Reversal in Turbulent Boundary Layers with Varying Pressure Gradients

Flow Reversal in Turbulent Boundary Layers with Varying Pressure Gradients

... of turbulent boundary layers (TBL) are investigated in detail in order to understand their possible connection with large scale structures which develop in the external ...

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An investigation of turbulent boundary layers with streamwise and spanwise pressure gradients

An investigation of turbulent boundary layers with streamwise and spanwise pressure gradients

... possible boundary layer response is evident in the two-part study by (Fernholz and Warnack, 1998; Warnack and Fernholz, ...the turbulent boundary layers developed over two different ...

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Acoustic loading beneath hypersonic transitional and turbulent boundary layers

Acoustic loading beneath hypersonic transitional and turbulent boundary layers

... and turbulent boundary layers and associated acoustic loading on a flat ...fully turbulent boundary ...fully turbulent flows, especially in the high-frequency region of the ...

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Prediction of trailing-edge noise for separated turbulent boundary layers

Prediction of trailing-edge noise for separated turbulent boundary layers

... alexandre.suryadi@dlr.de Abstract. This paper presents a semi-empirical low-order prediction of the trailing-edge noise of separated turbulent boundary layers. The prediction focuses on obtaining the ...

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Prediction of trailing-edge noise for separated turbulent boundary layers

Prediction of trailing-edge noise for separated turbulent boundary layers

... alexandre.suryadi@dlr.de Abstract. This paper presents a semi-empirical low-order prediction of the trailing-edge noise of separated turbulent boundary layers. The prediction focuses on obtaining the ...
Physics and modeling of turbulent advective transport in turbulent boundary layers, Juan Carlos Cuevas Bautista

Physics and modeling of turbulent advective transport in turbulent boundary layers, Juan Carlos Cuevas Bautista

... IN TURBULENT BOUNDARY LAYERS Understand the dynamics of the transport of passive scalars by turbulent flows is a fundamental task which requires the modeling of physical mechanisms such as ...

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Computational aeroacoustics beneath high speed transitional and turbulent boundary layers

Computational aeroacoustics beneath high speed transitional and turbulent boundary layers

... • High SPL values are associated with shock re-attachment and structural panels will be subjected to the strongest acoustic fatigue in this region. • Spectral analysis was performed at various points on the ...

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Physical insight into the accuracy of finely-resolved iLES in turbulent boundary layers

Physical insight into the accuracy of finely-resolved iLES in turbulent boundary layers

... Abstract This paper investigates the numerical accuracy of implicit Large Eddy Sim- ulations (iLES) in relation to compressible turbulent boundary layers (TBL). iLES are conducted in conjunction with ...

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Wall-pressure spectra models for supersonic and hypersonic turbulent boundary layers

Wall-pressure spectra models for supersonic and hypersonic turbulent boundary layers

... This paper presents an investigation of pressure fluctuations spectra beneath supersonic and hypersonic turbulent boundary layers at zero pressure gradi- ent. High-order implicit Large Eddy ...

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Resolvent-based study of compressibility effects on supersonic turbulent boundary layers

Resolvent-based study of compressibility effects on supersonic turbulent boundary layers

... supersonic turbulent boundary layers still remain a daunting ...the boundary layer requires the use of an extremely long computational domain, which makes accurate numerical simulations ...

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The effect of freshwater biofilms on
turbulent boundary layers and the
implications for hydropower canals

The effect of freshwater biofilms on turbulent boundary layers and the implications for hydropower canals

... Seven methods for determining the wall shear stress were investigated; however, none of the methods examined were entirely satisfactory. A method which can be used for both smooth and rough surfaces with reasonable ...

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The effect of freshwater biofilms on
turbulent boundary layers and the
implications for hydropower canals

The effect of freshwater biofilms on turbulent boundary layers and the implications for hydropower canals

... al.(2006) and Kunkel et al. (2007). The mean velocity and high order statistics strongly supported the notion of outer layer similarity for rough walls, in which there is a large separation between the roughness length ...

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Large-eddy Simulation of Turbulent Boundary Layers with Spatially Varying Roughness

Large-eddy Simulation of Turbulent Boundary Layers with Spatially Varying Roughness

... findings Turbulent boundary layers are present in a variety of engineering applications, and present a challenging class of problems whose detailed understanding will help to improve predictive ...

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Modelling dispersion in turbulent boundary layers
using centre manifold technique

Modelling dispersion in turbulent boundary layers using centre manifold technique

... in turbulent boundary layers based on centre manifold ...along turbulent channel ...no-flux boundary conditions on the bottom and the ...well-defined turbulent diffusion ...in ...

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Computational aeroacoustics beneath high speed transitional and turbulent boundary layers

Computational aeroacoustics beneath high speed transitional and turbulent boundary layers

... • High SPL values are associated with shock re-attachment and structural panels will be subjected to the strongest acoustic fatigue in this region. • Spectral analysis was performed at various points on the ...

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Transformations for variable-property turbulent boundary layers

Transformations for variable-property turbulent boundary layers

... a boundary layer thickness should stay roughly that size (even if the ruler that is a boundary layer thickness ...in boundary layers and channels is depicted in figure ...a boundary ...

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Turbulent boundary layers with adverse pressure gradient

Turbulent boundary layers with adverse pressure gradient

... the boundary layer under a certain pressure-gradient magnitude, exhibit skin-friction and shape-factor curves consistent with the ones proposed by Vinuesa et ...

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Silent inflow condition for turbulent boundary layers

Silent inflow condition for turbulent boundary layers

... on boundary-layer ...the boundary layer near a leading ...the boundary layer, called Klebanoff ...compressible boundary-layer flow [ 71 ...a turbulent spot is formed [ 72 ...

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