Simulations for Flow-Symmetry Through r.avaflow in the General Two-Phase Mass Flow Model

Kafle, Jeevan; Kattel, Parameshwari

doi:10.3126/jnms.v2i2.33009

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…flow, such as virtual mass force, non-Newtonian viscous stress and generalized drag. Employing this model and the simulation techniques, there are significant studies of debris flow dynamics and obstacle-interactions both in subaerial and submarine environments [11,12,13,14,15,16,17,18,19,20,21,22,32,39,40].…”

Section: Introductionmentioning

confidence: 99%

Rheological Parameter Analysis in Generalized Bulk Mixture Mass Flow Model

Pokhrel¹,

Kattel²,

Khattri³

et al. 2020

Nepali Math. Sci. Rep.

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Pokhrel et al. recently developed a generalized quasi two-phase bulk mixture model for mass flow. This model has been constructed by employing full dimensional two-phase mass flow model equations. The model is a set of coupled partial differential equations which is characterized by some new mechanical and dynamical aspects of generalized bulk and shear viscosities, pressure, velocities and effective friction for the mixture where all these are evolving as functions of several dynamical variables, physical parameters, inertial and dynamical coefficients and drift factors. They formulated pressure and rate-dependent Coulumbviscoplastic rheology of the mixture mass flow to describe the model equation. Rheological behavior of the flow dynamics affects the whole dynamics of mixture mass flow. So, in this paper, the relations of mixture pressure and viscosity with respect to pressure drifts and solid volume fractions are studied to describe the rheological behavior of the generalized bulk mixture mass flow model. Moreover, the behaviour of mixture viscosities with respect to isotrophic drifts are also analyzed. We also present the simulation result for the time evolution of the drift induced full dynamical mixture pressure of the material exited from a silo gate that moves down slope along a channel.

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Section: Introductionmentioning

confidence: 99%

Rheological Parameter Analysis in Generalized Bulk Mixture Mass Flow Model

Pokhrel¹,

Kattel²,

Khattri³

et al. 2020

Nepali Math. Sci. Rep.

Self Cite

View full text Add to dashboard Cite

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Impact of variation of size of the initial release mass in the dynamics of landslide generated tsunami

Kafle

Acharya

Kattel

et al. 2022

Int. J. Model. Simul. Sci. Comput.

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When debris flows, landslides, or any gravitational mass flows hit closed or partially open water sources such as seas, oceans, fjords, hydraulic reservoirs, mountain lakes, bays, and landslide dams, it results in tsunami (impulse water waves) by transforming their impact energy to water body, potentially causing damages of infrastructures and human casualties both near field and the distant coastlines. The intensity of hazard depends on the scale, location and process of the landslide, and also on the reservoir volume and topography that surrounds it. Volume or size of the initial release mass that fails and slides along a slope is one of the dominant factors to determine the degree of splash, propagating speed and the amplitudes of the fluid waves, and potential dam breach or water spill over. Here, we numerically integrate the two-phase mass flow model [Pudasaini S. P., J. Geophysi. Res. 117(F03010), 2012] for quasi-three-dimensional, high-resolution simulation results with variation of size of the two-phase initial landslide or debris both longitudinally and laterally. In our numerical experimental results, we observe fundamentally different solid and fluid evolution and wave structures in the reservoir. There are also significant differences in the flow dynamics of solid under water for different volumes of the release mass by extending or contracting the base area along downslope and/or cross-slope directions. The simulation results show that tsunami amplitudes and run out extents are rapidly increased when the volume of the initial release mass in the form of a triangular wedge is increased by increasing the base area through the increment of the length and breadth of the release base. This study can be useful to develop and implement tsunami hazard mitigation strategies to enhance public safety and reduce potential loss due to landslide-generated wave hazards.

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Simulations for Flow-Symmetry Through r.avaflow in the General Two-Phase Mass Flow Model

Cited by 2 publications

References 31 publications

Rheological Parameter Analysis in Generalized Bulk Mixture Mass Flow Model

Rheological Parameter Analysis in Generalized Bulk Mixture Mass Flow Model

Impact of variation of size of the initial release mass in the dynamics of landslide generated tsunami

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