Investigations of dynamic behaviors of lock-exchange turbidity currents down a slope based on direct numerical simulation

He, Zhiguo; Zhao, Liang; Hu, Peng; Yu, Rena C.; Lin, Ying-Tien

doi:10.1016/j.advwatres.2018.07.008

Cited by 17 publications

(19 citation statements)

References 54 publications

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“…This means that the actual front velocity u front increases positively in relation to the increase in initial particle concentration, which is consistent with the understanding of previous studies (Bonnecaze, Huppert & Lister 1993;Hu et al 2020). In figure 3(b), as the slope angle increases (θ < 20 • ), the gradient becomes larger, indicating a larger front velocity of the TC (He et al 2018;Steenhauer, Tokyay & Constantinescu 2017). The steepening of the slope raises the current barycentre, resulting in an increasing available particle potential energy, which will be converted into the kinetic energy of the system.…”

Section: Development Of the Tcsupporting

confidence: 90%

“…For the accelerating particles in figure 13(a), the positive average F T // first increases and then decreases at t = 0 ∼ 4, due to the sum of the lift force and contact force exceeding the sum of the negative effective drag force and added mass force. After t = 4, F T // is basically near zero, suggesting that the head particles are roughly advancing at a constant speed on average, consistent with the evolution of the front position (Blanchette et al 2005;He et al 2018). Due to the fundamental driving action of G // , the particle velocity is always greater than the fluid velocity, resulting in a negative F d // .…”

Section: Auto-suspension Particle Statistics and Fluid-particle Inter...supporting

confidence: 57%

“…In recent years, the coupled model of solving individual particle motion with the discrete element method (DEM) and fluid motion has been widely used to simulate two-phase flows, such as Schmeeckle (2014), Sun & Xiao (2016), Jing et al (2016), Maurin, Chauchat & Frey (2018), Pähtz & Durán (2018a), Pähtz & Durán (2018b), Pähtz & Durán (2020) and Zhu et al (2020). This approach does not evolve the Boussinesq approximation, different from the Eulerian-Eulerian model (He et al 2018). For TCs, Biegert et al (2017) coupled a two-fluid model with a particle resolved model and explored how a TC travelling along the surface of the sediment bed propagates within the bed.…”

Section: Introductionmentioning

confidence: 99%

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Turbidity currents propagating down an inclined slope: particle auto-suspension

Xie

Zhu

et al. 2023

J. Fluid Mech.

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The turbidity current (TC), a ubiquitous fluid–particle coupled phenomenon in the natural environment and engineering, can transport over long distances on an inclined terrain due to the suspension mechanism. A large-eddy simulation and discrete element method coupled model is employed to simulate the particle-laden gravity currents over the inclined slope in order to investigate the auto-suspension mechanism from a Lagrangian perspective. The particle Reynolds number in our TC simulation is $0.01\sim 0.1$ and the slope angle is $1/20 \sim 1/5$ . The influences of initial particle concentration and terrain slope on the particle flow regimes, particle movement patterns, fluid–particle interactions, energy budget and auto-suspension index are explored. The results indicate that the auto-suspension particles predominantly appear near the current head and their number increases and then decreases during the current evolution, which is positively correlated with the coherent structures around the head. When the turbidity current propagates downstream, the average particle Reynolds number of the auto-suspension particles remains basically unchanged, and is higher than that of other transported particles. The average particle Reynolds number of the transported particles exhibits a negative correlation with the Reynolds number of the current. Furthermore, the increase in particle concentration will enhance the particle velocity, which allows the turbidity current to advance faster and improves the perpendicular support, thereby increasing the turbidity current auto-suspension capacity. Increasing slope angle will result in a slightly larger front velocity, while the effect of that on the total force is insignificant.

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Section: Development Of the Tcsupporting

confidence: 90%

Section: Auto-suspension Particle Statistics and Fluid-particle Inter...supporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

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Turbidity currents propagating down an inclined slope: particle auto-suspension

Xie

Zhu

et al. 2023

J. Fluid Mech.

Self Cite

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“…A similar extent of reduction (decrease about 67%) in the particle gravitational potential energy has been reported by Necker et al (2002). After 2.0 s, due to particle collapse (He et al, 2018), its decreasing rates slow down to 0.10 s -1 .…”

Section: Head Dynamics From the Perspective Of The Interaction Forcessupporting

confidence: 81%

“…The former include box models (e.g., Dade and Huppert, 1995;Gladstone and Woods, 2000) and shallow water models (e.g., Parker et al, 1986;Parker et al, 1987;Bonnecaze et al, 1993;Hu and Cao, 2009;Hu et al, 2012;Hu et al, 2015;Liu et al, 2017;Wang et al, 2017;Yang et al, 2019;Hu et al, 2019;Alhaddad et al, 2020). The latter include Reynolds-averaged Navier-Stokes (RANS) equations (e.g., Huang et al, 2007Huang et al, , 2008Abd El-Gawad et al, 2012;Felix, 2001;An and Li, 2010), Large Eddy Simulations (LES) (e.g., Kyrousi et al, 2018), and Direct Numerical Simulations (DNS) (e.g., Necker et al, 2002Necker et al, , 2005Strauss and Glinsky, 2012;Espath et al, 2014;Nasr-Azadani and Meiburg, 2014;Francisco et al, 2017;He et al, 2018;He et al, 2019;Zhao et al, 2019). Depth-resolving models can be further subdivided into quasi-single-phase and two-phase models.…”

Section: Introductionmentioning

confidence: 99%