The present state of atomic physics

Richardson, O. W.

doi:10.1088/0959-5309/39/1/316

Cited by 14 publications

(29 citation statements)

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“…It is convinced that this theoretical relation corresponds to the empirical one, K=02 L4/3 cm2.sec-1, which was found for the wide range of horizontal diffusion phenomena in the atmosphere by Richardson (1926) (9). Thus, to some extent, we might be able to consider safely that the atmosphere has such the structure as assumed above.…”

supporting

confidence: 66%

On the Turbulent Diffusion in the Atmosphere. (I)

Inoue

1950

Journal of the Meteorological Society of Japan

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supporting

confidence: 66%

On the Turbulent Diffusion in the Atmosphere. (I)

Inoue

1950

Journal of the Meteorological Society of Japan

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“…∼t 1/2 . For intermediate time scales the dispersion follows the Richardson law, ∼t 3/2 (Richardson 1926). Figure 12 shows the evolution between z = 30 and z = 0.5 of the pair dispersion statistics derived with N = 10 6 couples of tracers in the same cluster run.…”

Section: Tracers Dispersion Statisticsmentioning

confidence: 99%

The mixing and transport properties of the intra cluster medium: a numerical study using tracers particles

Vazza¹,

Gheller²,

Brunetti³

2010

A&A

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We present a study of the mixing properties of the simulated intra cluster medium, using tracers particles that are advected by the gas flow during the evolution of cosmic structures. Using a sample of seven galaxy clusters (with masses in the range of M ∼ 2−3 × 10 14 M /h) simulated with a peak resolution of 25 kpc/h up to the distance of two virial radii from their centers, we investigate the application of tracers to some important problems concerning the mixing of the ICM. The transport properties of the evolving ICM are studied through the analysis of pair dispersion statistics and mixing distributions. As an application, we focus on the transport of metals in the ICM. We adopt simple scenarios for the injection of metal tracers in the ICM, and find remarkable differences of metallicity profiles in relaxed and merger systems also through the analysis of simulated emission from Doppler-shifted Fe XXIII lines.

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“…where X 1 (t) is the position of the first particle and X 2 (t) the position of the second particle at time t. The first quantity of interest is the mean-square separation between the two particles ∆ 2 (t) as a function of time which has received much research attention since the pioneering work of [1] (see for example [2][3][4][5][6][7][8][9][10][11][12][13][14]). …”

mentioning

confidence: 99%

Presence of a Richardson’s regime in kinematic simulations

Nicolleau

Nowakowski

2011

Phys. Rev. E

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In this paper we investigate Kinematic Simulation (KS) consistency with the theory of Richardson [1] for two-particle diffusivity. In particular we revisit the sweeping problem. It has been argued in [2] that due to the lack of sweeping of small scales by large scales in Kinematic Simulation, the validity of Richardson's power law might be affected. Here, we argue that the discrepancies between authors on the ability of Kinematic Simulation to predict Richardson power law may be linked to the inertial subrange they have used. For small inertial subranges, KS are efficient and the significance of the sweeping can be ignored, as a result we limit the KS agreement with the Richardson scaling law t 3 for inertial subranges kN /k1 ≤ 10000. For larger inertial range KS do not fully follow the t 3 law. Unfortunately, there is no experimental data to compare KS with and draw conclusions for such large inertial subranges. It cannot be concluded either that the discrepancy between KS and Richardson's theory for larger inertial subranges is exactly taken into account by the theory developed in (Thomson & Devenish, J. Fluid Mech. 526, 2005).

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The present state of atomic physics

Cited by 14 publications

References 0 publications

On the Turbulent Diffusion in the Atmosphere. (I)

On the Turbulent Diffusion in the Atmosphere. (I)

The mixing and transport properties of the intra cluster medium: a numerical study using tracers particles

Presence of a Richardson’s regime in kinematic simulations

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