Turbulent shear-layer mixing: growth-rate compressibility scaling

Slessor, M. D.; Zhuang, Mei; Dimotakis, Paul E.

doi:10.1017/s0022112099006977

Cited by 118 publications

(64 citation statements)

References 28 publications

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“…2 1 2 with M c as the ratio of v h with the minimum of the sound speeds of the shearing fluids (Slessor et al 2000), which in this case is the sound speed of the cloud, c s,c . Thus the shear layer will grow to the size of the cloud in a timescale where M is the Mach number of the flow relative to the exterior sound speed.…”

Section: Cold Cloud Disruption and Coolingmentioning

confidence: 99%

The Launching of Cold Clouds by Galaxy Outflows. Ii. The Role of Thermal Conduction

Brüggen

Scannapieco

2016

ApJ

132

123

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We explore the impact of electron thermal conduction on the evolution of radiatively cooled cold clouds embedded in flows of hot and fast material as it occurs in outflowing galaxies. Performing a parameter study of threedimensional adaptive mesh refinement hydrodynamical simulations, we show that electron thermal conduction causes cold clouds to evaporate, but it can also extend their lifetimes by compressing them into dense filaments. We distinguish between low column-density clouds, which are disrupted on very short times, and high-column density clouds with much longer disruption times that are set by a balance between impinging thermal energy and evaporation. We provide fits to the cloud lifetimes and velocities that can be used in galaxy-scale simulations of outflows in which the evolution of individual clouds cannot be modeled with the required resolution. Moreover, we show that the clouds are only accelerated to a small fraction of the ambient velocity because compression by evaporation causes the clouds to present a small cross-section to the ambient flow. This means that either magnetic fields must suppress thermal conduction, or that the cold clouds observed in galaxy outflows are not formed of cold material carried out from the galaxy.

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Section: Cold Cloud Disruption and Coolingmentioning

confidence: 99%

The Launching of Cold Clouds by Galaxy Outflows. Ii. The Role of Thermal Conduction

Brüggen

Scannapieco

2016

ApJ

132

123

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“…More recent work by Slessor et al (2000) has argued for an alternative compressibility parameter (Π C ), which collapses the experimental data better. Π C is based on an expression derived from considerations of the ratio of kinetic energy to thermal energy (enthalpy).…”

Section: Introductionmentioning

confidence: 99%

Measurements in the annular shear layer of high subsonic and under-expanded round jets

Tao

McGuirk

2015

Exp Fluids

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“…Furthermore, the shear layer growth is coupled to the turbulent fluctuations [30]. Figure 8 shows the profiles of the local peak Reynolds stresses…”

Section: Characteristics Of Separated Shear-layer Evolutionmentioning

confidence: 99%

Large-eddy simulation of the compressible flow past a tabbed cylinder

Zhao

Sun

2012

Chin. Sci. Bull.

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The compressible flow past a tabbed cylinder has been studied numerically using large-eddy simulation for a free-stream Mach number M∞=0.75 and a Reynolds number based on the diameter Re=2×10 5 . Because of the passive control of the flow past a tabbed cylinder, the mean drag coefficient of tabbed cylinder is less than that of a corresponding circular cylinder with a drag reduction up to 33%. The fluctuating lift coefficient is greatly suppressed to be nearly zero. Drag reduction due to the shearing process prevails over that due to the compressing process in this flow. Through investigating the mechanisms relevant to passive control of the tab, it is found that suppression of the shear layer instability can lead to a higher-base-pressure distribution, which can reasonably be associated with drag reduction and suppression of the lift fluctuations. The analysis of convective Mach number and self-sustained oscillations phenomenon inside the shear layers indicates that both the compressible effect and high-frequency forcing result in suppression of the shear layer instability of tabbed cylinder. circular cylinder, shock wave, compressible turbulence, large-eddy simulation Citation:Xu C Y, Zhao L Q, Sun J H. Large-eddy simulation of the compressible flow past a tabbed cylinder.

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Turbulent shear-layer mixing: growth-rate compressibility scaling

Cited by 118 publications

References 28 publications

The Launching of Cold Clouds by Galaxy Outflows. Ii. The Role of Thermal Conduction

The Launching of Cold Clouds by Galaxy Outflows. Ii. The Role of Thermal Conduction

Measurements in the annular shear layer of high subsonic and under-expanded round jets

Large-eddy simulation of the compressible flow past a tabbed cylinder

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