TRENT2D, a quasi-two-phase numerical code to simulate debris flow dynamics

2016 ◽  
pp. 1353-1360
Author(s):  
I Manzella ◽  
I Penna ◽  
K Kelfoun ◽  
M Jaboyedoff
Keyword(s):  
Debris Flow ◽  
Flow Dynamics ◽  
Numerical Code ◽  
Two Phase

scholarly journals Interaction of Two-phase Debris Flow with Lateral Converging Shear Walls

2018 ◽  
Vol 1 (2) ◽  
pp. 40-52
Author(s):  
Parameshwari Kattel ◽  
Bhadra Man Tuladhar
Keyword(s):  
Debris Flow ◽  
Debris Flows ◽  
Morphological Changes ◽  
Shear Walls ◽  
Flow Dynamics ◽  
Mass Force ◽  
Lateral Shear ◽  
Parabolic Pdes ◽  
Two Phase ◽  
Contraction Ratio

Landslides, debris avalanches and debris flows are common mass wasting phenomena in mountain slopes. Debris flows can increase their volume and destructive potential by scouring undermining banks, thereby bringing morphological changes. Construction of lateral shear walls as embankments is a way of mitigation. In natural debris flows, solid and fluid evolve dynamically differently and show different inter-action with obstacles. So, we employ a general two-phase mass flow model (Pudasaini, 2012) consisting of a set of highly non-linear and hyperbolic-parabolic PDEs for mass and momentum balances for both downslope and cross-slope directions. Besides buoyancy, the model includes the dominant physical aspects of the flow: virtual mass force, generalized drag and non-Newtonian viscous stress. Our numerical experiments show that the solid is more obstructed than the fluid when a debris flow passes over a system of converging lateral shear walls resulting in different flow-dynamics, wall-interactions and run out morphology of the phases. Narrower the slit, more is the obstruction. Solid component is more obstructed than the fluid, resulting in a phase-separation. The obstruction is related with the contraction ratio due to the converging shear walls. These computations and the observations increase our understanding of the flow dynamics and interactions with the lateral shear walls. The results may be extended further to achieve some engineering solutions to hazard mitigation in debris-flow prone zones. 

Numerical Modeling of Evolution of Boundary Between Incompressible Gas and Liquid in Two-Dimensional Region

2006 ◽  
Vol 4 ◽  
pp. 224-236
Author(s):  
A.S. Topolnikov
Keyword(s):  
Numerical Modeling ◽  
Interphase Boundary ◽  
Incompressible Liquid ◽  
Stokes Equations ◽  
Numerical Code ◽  
Navier Stokes ◽  
Two Phase ◽  
Navier Stokes Equations ◽  
Incompressible Media ◽  
Good Agreement

The paper is devoted to numerical modeling of Navier–Stokes equations for incompressible media in the case, when there exist gas and liquid inside the rectangular calculation region, which are separated by interphase boundary. The set of equations for incompressible liquid accounting for viscous, gravitational and surface (capillary) forces is solved by finite-difference scheme on the spaced grid, for description of interphase boundary the ideology of Level Set Method is used. By developed numerical code the set of hydrodynamic problems is solved, which describe the motion of two-phase incompressible media with interphase boundary. As a result of numerical simulation the solutions are obtained, which are in good agreement with existing analytical and experimental solutions.

scholarly journals A two-phase shallow debris flow model with energy balance

2015 ◽  
Vol 49 (1) ◽  
pp. 101-140 ◽  
Author(s):  
F. Bouchut ◽  
E.D. Fernández-Nieto ◽  
A. Mangeney ◽  
G. Narbona-Reina
Keyword(s):  
Energy Balance ◽  
Debris Flow ◽  
Flow Model ◽  
Two Phase

Two-Phase Flow Dynamics

2021 ◽  
pp. 541-623
Author(s):  
Neil E. Todreas ◽  
Mujid S. Kazimi
Keyword(s):  
Two Phase Flow ◽  
Flow Dynamics ◽  
Phase Flow ◽  
Two Phase

scholarly journals The study of gas-liquid flow dynamics in the inclined-corrugated elements of cooling tower filler unit

2019 ◽  
Vol 126 ◽  
pp. 00031 ◽  
Author(s):  
lnur N. Madyshev ◽  
Aliya I. Khafizova ◽  
Oksana S. Dmitrieva
Keyword(s):  
Liquid Flow ◽  
Cooling Tower ◽  
Cooling System ◽  
Flow Dynamics ◽  
Stable Operation ◽  
Liquid Cooling ◽  
Two Phase ◽  
Liquid Drops ◽  
Gas Liquid Flow ◽  
Liquid Cooling System

This paper deals with the studies of cooling tower, operated with the contactless evaporative cooling technology. The authors developed the cooling tower with a three-flow liquid cooling system. The authors conducted the numerical studies of gas-liquid flow dynamics in the inclined-corrugated elements of checker filling unit that allows to give us an idea of two-phase flow structure, its movement throughout the checker filling, as well as to assess the influence of mode parameters on the efficiency of collecting the liquid drops and the range of stable operation of device. The most effective operation of this device is at the pressure drop of 100 Pa, while developing the average air flow rate in the element up to 3.2 m/s.

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