An optimized volume of fluid method for modelling three-dimensional debris flows. Implementation in OpenFOAM, validation, and application in the Aiwa Watershed, Beijing

Zhang, Yan; Lyu, Liqun

doi:10.1016/j.compgeo.2022.104651

Cited by 10 publications

(10 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on our field investigation data such as the volume, runout distance, etc., we can take a dynamic analysis of the runout behavior and dynamics of the Tianmo debris flow based on numerical simulation. In our previous work, we proposed a multiphase model to simulate the flow characteristics of debris flow with considering the interphase interaction (Zhang et al., 2022). However, this model required huge computational costs attributed to the resolution of flow height.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, we do not consider the deposition process

\left({u}_{{b}_{D}}=0\right)

. Based on our previous work (Zhang et al., 2022), the two phases interaction tensor τ m is given in Equation 7. The velocity slip U sf between the solid and fluid can be expressed as

{\boldsymbol{U}}_{sf}={\boldsymbol{U}}_{r}{\left(1-{\alpha }_{s}\right)}^{a}

, where U r and a are constants (Damián & Nigro, 2014).…”

Section: Methodsmentioning

confidence: 99%

“…To investigate the runout behavior and dynamic characteristics of the Tianmo debris flow, a dynamic analysis can be performed based on the field investigation data such as the volume, runout distance, and deposition distribution, by using the numerical simulation. According to our previous work (Zhang et al, 2022), the continuity and momentum balance equations for a two-phase debris flow, which contains fluids and solids, are expressed as…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Preliminary Investigation on the Kinetic Characteristics of the Glacial Debris Flows in Tianmo Valley, Tibet Plateau, China

Zhang,

Lyu,

Ren

et al. 2024

JGR Earth Surface

Self Cite

View full text Add to dashboard Cite

Glacial debris flows occurring on the Tibetan Plateau consistently result in significant property damage and loss of human life. A comprehensive field investigation was conducted in Tianmo valley along the Sichuan‐Tibet Highway to reveal the dynamics of a debris flow that occurred on 11 July 2018. Furthermore, a depth‐averaged multiphase debris flow model was proposed and employed to reconstruct the characteristics of the debris flow. The model derivation, implementation, evaluation, and application were presented to demonstrate its performance. The Voellmy model was chosen because it adequately accounts for both basal frictional effects and the entrainment phenomenon. The entrainment processes, the ice melting, and the lubrication effect, were also taken into consideration. Based on the numerical results combined with field investigation data, the kinetic characteristics of the glacial debris flow were analyzed. The Tianmo valley has a small area, but the volume and erosion rate of debris flows were much larger than that of two‐phase debris flows in the same location due to ice melting. The simulation results demonstrated that the glacial debris reached a peak velocity of 20 m/s. Additionally, the volume of the debris flow increased by 50% due to the erosion over a short runout distance of approximately 4,000 m. This increase was a result of the high velocity and abundant entrainment sources on the slope. This study aims to improve understanding of the high velocity and destructive potential of debris flows in the Tianmo valley.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Therefore, we do not consider the deposition process

\left({u}_{{b}_{D}}=0\right)

. Based on our previous work (Zhang et al., 2022), the two phases interaction tensor τ m is given in Equation 7. The velocity slip U sf between the solid and fluid can be expressed as

{\boldsymbol{U}}_{sf}={\boldsymbol{U}}_{r}{\left(1-{\alpha }_{s}\right)}^{a}

, where U r and a are constants (Damián & Nigro, 2014).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Preliminary Investigation on the Kinetic Characteristics of the Glacial Debris Flows in Tianmo Valley, Tibet Plateau, China

Zhang,

Lyu,

Ren

et al. 2024

JGR Earth Surface

Self Cite

View full text Add to dashboard Cite

show abstract

“…The MULES algorithm uses an artificial compression velocity ( u r ) to implement this artificial compression technique. u r , which is calculated based on the phase flux values, limits the phase fluxes and maintains a sharp interface. − The term on the right-hand side of eq is a source term that arises due to the density variation of the liquid phase; note that we consider the “material derivative”, that is, D ρ 1 D t , while describing the density variation of the liquid phase.…”

Section: Theory and Simulation Methodsmentioning

confidence: 99%

Coalescence of 3D Polymeric Drops in the Presence of In Situ Photopolymerization

et al. 2023

View full text Add to dashboard Cite

We develop a combined numerical (using direct numerical simulation) and scaling model to study the dynamics of two identical photocurable, shear-thinning polymeric drops undergoing spreading and coalescence (on a substrate) in the presence of in situ curing. We only consider the shear-thinning nature of the drops but do not account for any changes in the drop elasticity during the in situ photocuring process. Two separate cases are studied: (1) τs ≪ τp (case 1) and (2) τs ∼ τp (case 2) (τs and τp represent the spreading and photocuring timescales, respectively). Photopolymerization-driven increase in the drop viscosity significantly delays the spreading and the coalescence events for case 2. Furthermore, for case 2, at any given time during the coalescence process, both the height and the width of the “bridge” that forms due to coalescence are always smaller than those for case 1. Our scaling analysis establishes three distinct regimes characterizing the bridge growth for both cases 1 and 2: the initial regime (viscous and capillary forces balance each other, and the bridge growth rate is weak), the intermediate regime (inertia and capillary forces balance each other, and the bridge growth rate is enhanced), and the late regime (viscous and capillary forces balance each other, and the bridge growth rate is weak). Also, in regimes where viscous forces play a role (initial and late regimes), the bridge growth is weaker for case 2, while in the intermediate regime, the rate of bridge growth is similar between cases 1 and 2. We also provide the temperature variation and the evolution of the curing front inside the coalescing drops for cases 1 and 2: the significantly rapid rate of polymerization for case 2 manifests in a noticeable temperature drop, fast propagation of the curing front, and the fluid flow (associated with coalescence) affecting the migration of the curing front inside the coalescing drops. We anticipate that our study will be crucial in designing polymeric droplet-based additive manufacturing systems and understanding the behavior of polymeric blends and polymeric emulsions.

show abstract

“…We probe the three-dimensional coalescence and mixing dynamics of the PVAc and the PMMA drops using direct numerical simulation (DNS). We employ a multiphase, incompressible, laminar flow-based volume of fluid (VOF) method. , The OpenFOAM solver interMixingFoam, which works based on the finite volume technique, is used to solve the soluto-hydrodynamics of the two drops. − Surface tension effects are incorporated in this solver. Such VOF-based framework to study the dynamics of miscible fluid (undergoing mixing) have been widely employed in several studies in the literature. ,, There are various studies that have provided the benchmark for the used standard VOF-based solver interMixingFoam. ,− The simulation domain used in this study is of size 125 μm × 125 μm × 100 μm.…”

Section: Theory and Simulation Methodsmentioning

confidence: 99%

Numerical Study of the Coalescence and Mixing of Drops of Different Polymeric Materials

2022

View full text Add to dashboard Cite

In this study, we employ direct numerical simulation (DNS) to investigate the solutal hydrodynamics dictating the three-dimensional coalescence of microscopic, identical-sized sessile drops of different but miscible shear-thinning polymeric liquids (namely, PVAc or polyvinyl acetate and PMMA or polymethylmethacrylate), with the drops being in partially wetted configuration. Despite the ubiquitousness of the interaction of different dissimilar droplets in a variety of engineering problems ranging from additive manufacturing to understanding the behavior of photonic crystals, coalescence of drops composed of different polymeric and non-Newtonian materials has not been significantly explored. Interaction of such dissimilar droplets often involves simultaneous drop spreading, coalescence, and mixing. The mixing dynamics of the dissimilar drops are governed by interphase diffusion, the residual kinetic energy of the drops stemming from the fact that coalescence starts before the spreading of the drops have been completed, and the solutal Marangoni convection. We provide the three-dimensional velocity fields and velocity vectors inside the completely miscible, dissimilar coalescing droplets. Our simulations explicate the relative influence of these different effects in determining the flow field at different locations and at different time instances and the consequent mixing behavior inside the interacting drops. We also show the non-monotonic (in terms of the direction of migration) propagation of the mixing front of the miscible coalescing drops over time. We also establish that the overall mixing (on either side of the mixing front) speeds up as the Marangoni effects dictate the mixing. We anticipate that our study will provide an important foundation for studying miscible multi-material liquid systems, which will be crucial for applications such as inkjet or aerosol jet printing, lab-on-a-chip, polymer processing, etc.

show abstract

An optimized volume of fluid method for modelling three-dimensional debris flows. Implementation in OpenFOAM, validation, and application in the Aiwa Watershed, Beijing

Cited by 10 publications

References 68 publications

Preliminary Investigation on the Kinetic Characteristics of the Glacial Debris Flows in Tianmo Valley, Tibet Plateau, China

Preliminary Investigation on the Kinetic Characteristics of the Glacial Debris Flows in Tianmo Valley, Tibet Plateau, China

Coalescence of 3D Polymeric Drops in the Presence of In Situ Photopolymerization

Numerical Study of the Coalescence and Mixing of Drops of Different Polymeric Materials

Contact Info

Product

Resources

About