Averaged model for probabilistic coalescence avalanches in two-dimensional emulsions: Insights into uncertainty propagation

2017 ◽  
Vol 95 (3) ◽  
Author(s):  
M. Danny Raj ◽  
R. Rengaswamy
Keyword(s):  
Uncertainty Propagation ◽  
Two Dimensional ◽  
Averaged Model

Two-dimensional depth-averaged model simulation

2015 ◽  
Author(s):  
Anna Avramenko ◽  
Jari Hamalainen
Keyword(s):  
Model Simulation ◽  
Two Dimensional ◽  
Averaged Model

Application of a two-dimensional hydrodynamic reservoir model to Lake Erie

2001 ◽  
Vol 58 (5) ◽  
pp. 858-869 ◽  
Author(s):  
L Boegman ◽  
M R Loewen ◽  
P F Hamblin ◽  
D A Culver
Keyword(s):  
Lake Erie ◽  
Nutrient Loading ◽  
Thermal Structure ◽  
Domain Model ◽  
Water Level Fluctuations ◽  
Two Dimensional ◽  
Large Lakes ◽  
Physical Forcing ◽  
Model Predictions ◽  
Averaged Model

The relative impacts of changes in nutrient loading and zebra mussel establishment on plankton in large lakes are strongly influenced by hydrodynamics, yet adequately modelling the temporal-spatial complexity of physical and biological processes has been difficult. We adapted a two-dimensional public domain model, CE-QUAL-W2, to test whether it could provide a hydrodynamically accurate simulation of the seasonal variation in the vertical-longitudinal thermal structure of Lake Erie. The physical forcing for the model is derived from surface meteorological buoys and measurements of precipitation, inflows, and outflows. To calibrate and validate the model, predictions were compared with an extensive set of field data collected during May through September 1994. The model accurately predicted water-level fluctuations without adjustment. However, significant modifications to the eddy coefficient turbulence algorithm were required to simulate acceptable longitudinal currents. The thermal structure was accurately predicted in all three basins, even though this laterally averaged model cannot simulate Coriolis effects. We are currently extending the model's water-quality module to include the effects of nutrient loading and zebra mussels on the plankton.

A new model of shoaling and breaking waves. Part 2. Run-up and two-dimensional waves

2019 ◽  
Vol 867 ◽  
pp. 146-194 ◽  
Author(s):  
G. L. Richard ◽  
A. Duran ◽  
B. Fabrèges
Keyword(s):  
Large Scale ◽  
Turbulent Viscosity ◽  
Breaking Waves ◽  
Small Scale ◽  
Two Dimensional ◽  
Numerical Resolution ◽  
Wide Range ◽  
Scale Turbulence ◽  
Run Up ◽  
Averaged Model

We derive a two-dimensional depth-averaged model for coastal waves with both dispersive and dissipative effects. A tensor quantity called enstrophy models the subdepth large-scale turbulence, including its anisotropic character, and is a source of vorticity of the average flow. The small-scale turbulence is modelled through a turbulent-viscosity hypothesis. This fully nonlinear model has equivalent dispersive properties to the Green–Naghdi equations and is treated, both for the optimization of these properties and for the numerical resolution, with the same techniques which are used for the Green–Naghdi system. The model equations are solved with a discontinuous Galerkin discretization based on a decoupling between the hyperbolic and non-hydrostatic parts of the system. The predictions of the model are compared to experimental data in a wide range of physical conditions. Simulations were run in one-dimensional and two-dimensional cases, including run-up and run-down on beaches, non-trivial topographies, wave trains over a bar or propagation around an island or a reef. A very good agreement is reached in every cases, validating the predictive empirical laws for the parameters of the model. These comparisons confirm the efficiency of the present strategy, highlighting the enstrophy as a robust and reliable tool to describe wave breaking even in a two-dimensional context. Compared with existing depth-averaged models, this approach is numerically robust and adds more physical effects without significant increase in numerical complexity.

A 2D Numerical Model for Simulation of Two-Dimensional Circular Dam-Break

2011 ◽  
Vol 130-134 ◽  
pp. 2993-2996
Author(s):  
Ming Qin Liu ◽  
Y.L. Liu
Keyword(s):  
Solution Procedure ◽  
Dam Break ◽  
Curvilinear Coordinates ◽  
Two Dimensional ◽  
Proposed Model ◽  
Curvilinear Coordinate ◽  
Orthogonal Curvilinear Coordinate System ◽  
Orthogonal Curvilinear Coordinates ◽  
Averaged Model ◽  
The Mathematical Model

The purpose of this paper is to present a 2D depth-averaged model under orthogonal curvilinear coordinates for simulating two-dimensional circular dam-break flows. The proposed model uses an orthogonal curvilinear coordinate system efficiently and accurately to simulate the flow field with irregular boundaries. As for the numerical solution procedure, The SIMPLEC solution procedure has been used for the transformed governing equations in the transformed domain. Practical application of the model is illustrated by an example, which demonstrates that the mathematical model can capture hydraulic discontinuities accurately such as steep fronts, hydraulic jump and drop, etc.

Stability Analysis of Two‐Dimensional Depth‐Averaged Model

1989 ◽  
Vol 115 (9) ◽  
pp. 1204-1222 ◽  
Author(s):  
Tawatchai Tingsanchali ◽  
Suphat Vongvisessomaji ◽  
Guan‐Jiun Hwang
Keyword(s):  
Stability Analysis ◽  
Two Dimensional ◽  
Averaged Model

Computer Simulation of the Hydrodynamic and Salinity Behavior of Weeks Bay, Alabama, at Equatorial Tide Conditions

1991 ◽  
Vol 24 (6) ◽  
pp. 165-169 ◽  
Author(s):  
Ashok Thollapalli ◽  
Gary C. April ◽  
Donald C. Raney ◽  
William W. Schroeder ◽  
Barry C. McCormick ◽  
...  
Keyword(s):  
Army Corps ◽  
Data Sets ◽  
Two Dimensional ◽  
Army Corps Of Engineers ◽  
Weeks Bay ◽  
Western Side ◽  
Water Elevations ◽  
Averaged Model ◽  
Good Agreement

Whereas the long term goal of the work described focuses on issues related to estuaries in general, specific attention in this paper focuses on one – Weeks Bay, Alabama. This estuary is one of seventeen estuarine research reserves established as “natural field laboratories” for long-term scientific and educational programs (See Figure 1). Initially, Weeks Bay will be assumed to be a well mixed estuary such that two-dimensional (depth averaged) modeling can be used. The Waterways Experiment Station Implicit Flooding Model (WIFM), developed by the U.S. Army Corps of Engineers, Vicksburg, Mississippi is used. Complete data sets at equatorial tidal conditions were chosen from the field data available. Good agreement of model results with field measured water elevations was noted. These results are typical of the kind of agreement that is expected from two-dimensional depth averaged model simulations. As anticipated, there seems to be little or no movement of salt along the western shoreline when the Bon Secour Bay salinities are low. This indicates selective flow of Fish River water down the western side of the bay with a corresponding preference for Bon Secour Bay water to flow along the eastern shore.

Reservoir Turbidity Current Modeling with a Two-Dimensional Layer-Averaged Model

2015 ◽  
Vol 141 (12) ◽  
pp. 04015029 ◽  
Author(s):  
Yong G. Lai ◽  
Jianchun Huang ◽  
Kuowei Wu
Keyword(s):  
Turbidity Current ◽  
Two Dimensional ◽  
Averaged Model
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