MODELING OF IRRIGATION CHANNELS — A COMPARATIVE STUDY

2007 ◽  
Vol 18 (04) ◽  
pp. 739-748 ◽  
Author(s):  
OLIVIER MARCOU ◽  
BASTIEN CHOPARD ◽  
SAMIRA EL YACOUBI
Keyword(s):  
Lattice Boltzmann ◽  
Stationary Regime ◽  
Irrigation Canal ◽  
Fluid System ◽  
Venant Equation ◽  
Irrigation Channels ◽  
Two Fluid ◽  
Theoretical Results ◽  
Water Profile

A free surface Lattice Boltzmann (LB) model – based on a two-fluid system – is considered to simulate the flow of water in an irrigation canal. We compare the behavior of our numerical simulations with simple experiments and theoretical results obtained from the Saint-Venant equation, the partial differential equation commonly used to describe water flow in irrigation canals. The case study we consider are (1) the height of water along the canal in a stationary regime and (2) a draining experiment. The comparisons show that the two-fluid LB approach captures correctly the draining speed and the qualitative water profile.

Remarks about factors shaping the heliosphere

2018 ◽  
Vol 92 (3) ◽  
pp. 329-335
Author(s):  
Romana Ratkiewicz ◽  
Wojciech Konior ◽  
Jan Kotlarz
Keyword(s):  
Status Report ◽  
Physical Processes ◽  
Content Type ◽  
General Review ◽  
New Information ◽  
Conceptual Paper ◽  
First Time ◽  
Practical Implications ◽  
Theoretical Results

Purpose The purpose of the paper is to give a brief description of the new topic introduced for the first time at the EASN Conferences. Design/methodology/approach The topic concerns the heliosphere, the nearest surrounding of the Sun and thus the nearest vicinity of the Earth. The heliosphere is created due to the interaction between the solar wind and the local interstellar medium. Findings This paper does not include any new information about the heliosphere and only introduces a new topic to this journal. It is briefly shown how heliospheric structures are formed, what factors affect a shape of the heliosphere, what measurements are made by Ulysses, Voyager and IBEX space missions (important for the heliosphere modeling) and how obtained data are used to validate theoretical results. Practical implications To categorize the paper under one of these classifications, research paper, viewpoint, technical paper, conceptual paper, case study, literature review or general review, the authors chose a paper type, general review, as the closest category to this paper. However, it is not a purpose of this paper to provide an extensive review of the community efforts to investigate the physical processes in the vicinity of the heliosphere interface. This is mostly a status report. Originality/value As the new topic in this journal, the article introduces in detail only a small number of aspects connected with heliosphere models. Interplanetary and interstellar magnetic field structures are primarily described. Other factors are only mentioned.

scholarly journals Stability of a sloping interface in a rotating two-fluid system

Tellus ◽  
1970 ◽  
Vol 22 (5) ◽  
pp. 493-503 ◽  
Author(s):  
Desiraju B. Rao ◽  
T. J. Simons
Keyword(s):  
Fluid System ◽  
Two Fluid

Lattice Boltzmann Simulation of Two-Fluid Model Equations

2008 ◽  
Vol 47 (23) ◽  
pp. 9165-9173 ◽  
Author(s):  
Krishnan Sankaranarayanan ◽  
Sankaran Sundaresan
Keyword(s):  
Lattice Boltzmann ◽  
Fluid Model ◽  
Lattice Boltzmann Simulation ◽  
Two Fluid Model ◽  
Model Equations ◽  
Two Fluid

Wave diffraction in a two-fluid system

1969 ◽  
Vol 36 (1) ◽  
pp. 65-73 ◽  
Author(s):  
R. E. Kelly
Keyword(s):  
Approximate Solution ◽  
Surface Wave ◽  
Wave Diffraction ◽  
Bottom Topography ◽  
Density Ratio ◽  
Frequency Parameter ◽  
Step Change ◽  
Shallow Water Theory ◽  
Fluid System ◽  
Two Fluid

Wave diffraction due to a step change in bottom topography is considered for the case of two superimposed fluids of different, but constant, densities. The interface lies below the upper surface of the step. Shallow water theory is shown to be applicable only if the ratio of a non-dimensional frequency parameter to the departure of the density ratio from unity is sufficiently small. An approximate solution of the full equations, obtained by a method applied by Miles (1967) to surface wave diffraction, yields results limited only by the condition that the frequency parameter be small.

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