Mixing Processes in a Numerical Model of the Western Dutch Wadden Sea

1990 ◽  
pp. 194-209 ◽  
Author(s):  
H. Ridderinkhof ◽  
J. T. F. Zimmerman
Keyword(s):  
Numerical Model ◽  
Wadden Sea ◽  
Mixing Processes

scholarly journals A numerical model for the entire Wadden Sea: Skill assessment and analysis of hydrodynamics

2016 ◽  
Vol 121 (7) ◽  
pp. 5231-5251 ◽  
Author(s):  
Ulf Gräwe ◽  
Götz Flöser ◽  
Theo Gerkema ◽  
Matias Duran‐Matute ◽  
Thomas H. Badewien ◽  
...  
Keyword(s):  
Numerical Model ◽  
Wadden Sea ◽  
Skill Assessment

scholarly journals Numerical Modeling of Multiple Inclined Dense Jets Discharged from Moderately Spaced Ports

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2077 ◽  
Author(s):  
Yan ◽  
Mohammadian
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Three Dimensional ◽  
Mixing Processes ◽  
Computational Costs ◽  
Promising Tool ◽  
Modeling Techniques ◽  
Turbulence Closures ◽  
Inclined Dense Jets ◽  
Better Than

Wastewaters are often discharged into water bodies from multiport diffusers in the form of inclined dense jets, and it is important to predict their mixing characteristics for a sound sustainable design for seawater desalination. Compared with single jets and multiple horizontal or vertical jets, the mixing processes of multiple inclined dense jets are more complicated, and thus the existing theoretical, analytical, or simplified numerical methods cannot effectively predict their dilution properties. Recent advances in numerical modeling techniques have provided a new avenue of simulating wastewater jets as three-dimensional phenomena, but their application to multiple inclined dense jets has rarely been reported. In this study, a fully three-dimensional numerical model is employed to simulate multiple inclined brine discharges from diffusers with moderately spaced ports, with the standard and re-normalization group (RNG) k-ε turbulence closures being tested. The simulated characteristic variables are compared to experimental data, and the results show that the simulations match very well with the experiments, demonstrating that the numerical model is a promising tool for simulating inclined dense jets discharged from multiport diffusers. The study also found that the RNG k-ε model performs better than the standard k-ε model without significantly increasing the computational costs.

scholarly journals Numerical modelling of disintegration of basin-scale internal waves in a tank filled with stratified water

2005 ◽  
Vol 12 (6) ◽  
pp. 955-964 ◽  
Author(s):  
N. Stashchuk ◽  
V. Vlasenko ◽  
K. Hutter
Keyword(s):  
Numerical Model ◽  
Internal Waves ◽  
Solitary Waves ◽  
Mixing Processes ◽  
Wave Regime ◽  
Stratified Lakes ◽  
Low Dissipation ◽  
Basin Scale ◽  
Shear Instabilities ◽  
Set Up

Abstract. We present the results of numerical experiments performed with the use of a fully non-linear non-hydrostatic numerical model to study the baroclinic response of a long narrow tank filled with stratified water to an initially tilted interface. Upon release, the system starts to oscillate with an eigen frequency corresponding to basin-scale baroclinic gravitational seiches. Field observations suggest that the disintegration of basin-scale internal waves into packets of solitary waves, shear instabilities, billows and spots of mixed water are important mechanisms for the transfer of energy within stratified lakes. Laboratory experiments performed by D. A. Horn, J. Imberger and G. N. Ivey (JFM, 2001) reproduced several regimes, which include damped linear waves and solitary waves. The generation of billows and shear instabilities induced by the basin-scale wave was, however, not sufficiently studied. The developed numerical model computes a variety of flows, which were not observed with the experimental set-up. In particular, the model results showed that under conditions of low dissipation, the regimes of billows and supercritical flows may transform into a solitary wave regime. The obtained results can help in the interpretation of numerous observations of mixing processes in real lakes.

scholarly journals A HYDRO-MORPHODYNAMIC NUMERICAL MODEL OF A WADDEN SEA AREA

2011 ◽  
Vol 1 (32) ◽  
pp. 9
Author(s):  
Eva Falke ◽  
Thorsten Albers ◽  
Erik Pasche
Keyword(s):  
Numerical Model ◽  
Shallow Water ◽  
Wadden Sea ◽  
Field Measurements ◽  
Sea Area

Based on field measurements a numerical model is developed to improve the knowledge of high resoluted morphodynamic processes in shallow water sections of Wadden Sea areas.

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