Numerical simulation of two coalescing turbulent forced plumes in linearly stratified fluids

Lou, Yingzhong; He, Zhiguo; Jiang, Houshuo; Han, Xiqiu

doi:10.1063/1.5087534

Cited by 24 publications

(10 citation statements)

References 79 publications

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“…2011; Lou et al. 2019) have shown good comparison with the theoretical and experimental results of Kaye & Linden (2004). However, the near-field entrainment of vertically offset sources has not been investigated.…”

Section: Introductionmentioning

confidence: 66%

“…In particular, time-averaged flows using the Reynolds-averaged Navier-Stokes (RANS) formulation provides a good representation of many aspects of single plume flow (Hargreaves, Scase & Evans 2012;Kumar et al 2022). Also, studies of multiple plumes using RANS (Durrani et al 2011;Lou et al 2019) have shown good comparison with the theoretical and experimental results of Kaye & Linden (2004). However, the near-field entrainment of vertically offset sources has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

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On the near-field interaction of vertically offset turbulent plumes

Richards,

Coker,

Florido

et al. 2023

J. Fluid Mech.

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The flow in and around a pair of plumes from sources that are vertically and horizontally offset is investigated. An analytical potential flow model is developed using an adapted version of the Milne–Thomson circle theorem to represent the flow due to adjacent circular and point sinks. This approximates the horizontal section through offset plumes, which have differing radii at the same vertical position. The predictions of this model are compared against Reynolds-averaged Navier–Stokes (RANS) simulations of the same system. These yield time-averaged results and so are particularly suitable for investigating the relatively weak entrainment field. Single and double plume results from RANS are also presented to compare with known results. Good agreement is found between the features in the analytical model and in the numerical solutions including the location of the stagnation point between the two plumes.

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Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

On the near-field interaction of vertically offset turbulent plumes

Richards,

Coker,

Florido

et al. 2023

J. Fluid Mech.

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“…We have developed the CFD models, which are extensions of the model proposed by Lou et al (2019), to predict the propagation of particle-free hydrothermal plumes in the deep ocean with and without crossflows. Specifically, we consider a single vent whose diameter is 0.2 m and the buoyancy flux B exit is 0.0805 m 4 /s 3 in the stratified ocean where the background buoyant frequency N is estimated to be 4.63 × 10 −4 s −1 as in situ measurements suggested.…”

Section: Methodsmentioning

confidence: 99%

“…As one of the commonest of carriers of particles, plumes in uniform (Carey et al, 1988;Veitch & Woods, 2000) and stratified environments (Balasubramanian et al, 2018;Mirajkar et al, 2015) have been widely investigated to characterize the settling behavior of particles. Recently, regarding the complex hydrodynamic environment in the ocean, a series of laboratory experiments and numerical simulations have been performed to study the detailed flow structures of hydrothermal plumes under various conditions (e.g., Contini et al, 2011;He et al, 2018;Jiang & Breier, 2014;Lou et al, 2019;Tao et al, 2013). The interaction between forced convection and a steady background flow is of particular interest since ocean currents are shown to greatly improve the mixing and transport of hydrothermal plumes (Lupton, 1995).…”

Section: Introductionmentioning

confidence: 99%

Transport and Deposition Patterns of Particles Laden by Rising Submarine Hydrothermal Plumes

Lou

Han

2020

Geophysical Research Letters

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Transport and deposition behavior of mineral particles driven by hydrothermal plumes along mid-ocean ridges is one of the least understood processes in geoscience. We reveal the mechanism and three typical transport patterns of particles emitted from submarine vents and subsequently laden by plumes in the stratified deep ocean with or without crossflows, that is, suspension, near-vent deposition, and long-distance transport, by developing a Lagrangian model coupled with a computational fluid dynamics model and using in situ measurements as model inputs. The particle trajectories suggest a general expression that predicts a linear variation of deposition location with the reciprocal of settling velocity, which potentially leads to a power law distribution of sediment mass along the radial direction. Our findings provide a new perspective on the accumulation of sediments near hydrothermal vents, indicating a critical role of the entrainment of plumes and consequent vortex systems in controlling deposition flux. Plain Language Summary Motion for mineral particles driven by hydrothermal plumes in the deep ocean is not well understood due to the complex environment involving a nonuniform background and ocean currents. To characterize particle trajectories and corresponding sediment distribution, we trace mineral particles using specialized computer code and analyze the results of the model. We find that the fate of particles mainly depends on the terminal velocity that they attain in the settling process, that is, the settling velocity which is related to particle size and density. Only the particles of the settling velocity within a specific range can deposit near the vent, while the larger/denser ones may stay suspended upon the vent and the smaller/lighter ones will always follow the plume mainstream. Due to the horizontal inward flows at the edge of plumes, called entrainment flows, and the resulting vortexes, settling particles would be concentrated at the near-vent region. This hydrodynamic mechanism for controlling deposition flux provides a new perspective on the enrichment of seafloor sediment and can improve understanding of the evolution of animals living in the deep ocean. This knowledge gap is mainly due to the complex nature of ocean environments, that is, stratification and crossflows, which renders tracing hydrothermal particles a significant challenge. Stratification greatly complicates the problem since it is prone to suppress the vertical motion of fluids (Ardekani & ©2020. American Geophysical Union. All Rights Reserved.

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“…In recent years, complementing the experimental studies [8][9][10][11][12], the simulation of the mixing processes of jets and plumes using fully physics-based computational fluid dynamics models has become popular because of the improvements in computing capabilities [13][14][15][16][17][18]. One shortcoming of the CFD approach is that it typically requires heavy computing resources and long simulation time, and it is thus helpful to propose a new technique that can make predictions faster with lower requirements for computing resources.…”

Section: Introductionmentioning

confidence: 99%

Simulations of the Concentration Fields of Rosette-Type Multiport Buoyant Discharges Using Combined CFD and Multigene Genetic Programming Techniques

Yan

Wang

Mohammadian

et al. 2021

JMSE

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Rosette-type diffusers are becoming popular nowadays for discharging wastewater effluents. Effluents are known as buoyant jets if they have a lower density than the receiving water, and they are often used for municipal and desalination purposes. These buoyant effluents discharged from rosette-type diffusers are known as rosette-type multiport buoyant discharges. Investigating the mixing properties of these effluents is important for environmental impact assessment and optimal design of the diffusers. Due to the complex mixing and interacting processes, most of the traditional simple methods for studying free single jets become invalid for rosette-type multiport buoyant discharges. Three-dimensional computational fluid dynamics (3D CFD) techniques can satisfactorily model the concentration fields of rosette-type multiport buoyant discharges, but these techniques are typically computationally expensive. In this study, a new technique of simulating rosette-type multiport buoyant discharges using combined 3D CFD and multigene genetic programming (MGGP) techniques is developed. Modeling the concentration fields of rosette-type multiport buoyant discharges using the proposed approach has rarely been reported previously. A validated numerical model is used to carry out extensive simulations, and the generated dataset is used to train and test MGGP-based models. The study demonstrates that the proposed method can provide reasonable predictions and can significantly improve the prediction efficiency.

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Numerical simulation of two coalescing turbulent forced plumes in linearly stratified fluids

Abstract: Harmonic linearized Navier-Stokes equation on describing the effect of surface roughness on hypersonic boundary-layer transition

Cited by 24 publications

References 79 publications

On the near-field interaction of vertically offset turbulent plumes

On the near-field interaction of vertically offset turbulent plumes

Transport and Deposition Patterns of Particles Laden by Rising Submarine Hydrothermal Plumes

Simulations of the Concentration Fields of Rosette-Type Multiport Buoyant Discharges Using Combined CFD and Multigene Genetic Programming Techniques

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