The formation of coherent structures within turbulent fountains in stratified media

Freire, Daniel; Kahan, Sandra; Cabeza, Cécilia; Sarasúa, L. G.; Martí, Arturo C.

doi:10.1016/j.euromechflu.2014.11.009

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…This has been attributed to differences in the experimental setup and source conditions [26]. Freire et al [27,28] showed that the value of α can be modified artificially by the introduction of fluctuations. In this work it has been observed that z m and thus α can be modified by the use of meshes at the source, keeping constant the other parameters that determine the flow.…”

Section: B Numerical Resultsmentioning

confidence: 99%

Spreading height and critical conditions for the collapse of turbulent fountains in stratified media

Sarasua,

Freire,

Cabeza

et al. 2020

Preprint

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Axisymmetric fountains in stratified environments rise until reaching a maximum height, where the vertical momentum vanishes, and then falls and spread radially as an annular plume following a well-known top-hat profile. Here, firstly, we generalize the model of Morton et al. (Proc. R. Soc. Lond. A 234, 1, 1956), in order to correctly determine the dependence of the maximum height and the spreading height with the parameters involved. We obtain the critical conditions for the collapse of the fountain, i.e. when the jet falls up to the source level, and show that the spreading height must be expressed as a function of at least two parameters. To improve the quantitative agreement with the experiments we modify the criterion to take the mixing process in the down flow into account. Numerical simulations were implemented to estimate the parameter values that characterizes this merging. We show that our generalized model agrees very well with the experimental measurements.

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Section: B Numerical Resultsmentioning

confidence: 99%

Spreading height and critical conditions for the collapse of turbulent fountains in stratified media

Sarasua,

Freire,

Cabeza

et al. 2020

Preprint

Self Cite

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“…Fountains are ubiquitous in nature, environmental settings, and industrial applications. Some typical examples include lava flows in magma chambers, 1 volcanic eruption, 2 release of effluent from desalination plants into the ocean, 3 replenishing the cold saline water in solar ponds, 4 elimination of the damage of radiation frost in agriculture using a selective inverted sink (SIS) device, 5 and reverse cycle air‐conditioning systems in buildings, 6 to name just a few. The fundamental significance and practical importance of fountains have led to extensive research on fountain flow since the 1950s, and Hunt and Burridge 7 provided a comprehensive review of some key studies on the topic.…”

Section: Introductionmentioning

confidence: 99%

Direct numerical simulation of “fountain filling box” flow with a confined weak laminar plane fountain

et al. 2022

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A "fountain filling box" flow produced by discharging a weak laminar plane fountain in a confined open channel is studied numerically. Two-dimensional direct numerical simulations were performed for weak plane fountains. The development of the fountain flow experiences five stages; the initial upflow and the subsequent downflow after the fountain penetrates to the maximum height, followed by the outward movement of the intrusion of the fallen fountain fluid on the channel bottom, and then the wall fountain formed by the impingement of the intrusion on the vertical sidewall, which results in the reversed flow, and finally the gradual stratification of the fluid. The behavior of the intrusion can be approximately described with the plane gravity current theory. The period for the intrusion to reach the bounded side wall increases with increasing Re or decreasing Fr. Three regimes are found for the wall fountain behavior; "nofalling," "slumping down," and "rolling down" behavior. Convection, mixing, conduction, and filling all

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Spectral entropy as a flow state indicator

Abdelsamie

Janiga

Thévenin

2017

International Journal of Heat and Fluid Flow

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The formation of coherent structures within turbulent fountains in stratified media

Cited by 6 publications

References 24 publications

Spreading height and critical conditions for the collapse of turbulent fountains in stratified media

Spreading height and critical conditions for the collapse of turbulent fountains in stratified media

Direct numerical simulation of “fountain filling box” flow with a confined weak laminar plane fountain

Spectral entropy as a flow state indicator

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