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Coastal Water Properties and Hydrodynamic Processes in the Malacca Strait: Case Study Northeastern Coast of Sumatra, Indonesia

100%

Koropitan A. F. , Barus T. A. , Cordova M. R.

tom Vol. 22, nr 11

16--29

Dynamic processes in the coastal waters play an important role in regulating the marine pollution distribution caused by riverine inputs and are relevant for coastal management. Here, the coastal water properties were investigated from field measurements and modeling hydrodynamic processes in the northeastern coast of Sumatra. The present study found that the river discharges affect a low salinity of 28–29 psu in the surface waters along near the coastal line. The river discharge might influence by strong La Niña with high rainfall in December 2010. However, the authors suggested that the effect of tidal mixing is stronger than the freshwater discharges, resulting in vertically well-mixed coastal waters in the region. The observed tidal range of 200 cm indicates a strong tidal mixing in the waters. The tidal elevation contributes more than 70% of the total measured sea elevation. The tidal current signal in which the flow pattern simulations show no significant differences among tide and wind-tide driven currents, is also dominant (77%).

3D numerical simulation of flow field around twin piles

75%

Amini A. , Parto A. A.

tom Vol. 65, no. 6

1243--1251

In this study to identify the flow pattern and local scour mechanism around pile groups, the flow field was simulated using FLOW-3D software. A pair of pile on a flat-bed channel with side by side and tandem arrangements was investigated. To establish Navier–Stokes equations, the RNGk-ε turbulence model was used and the results were verified using experimental data. In case of FLOW-3D capability, it was found that the software was able to properly simulate the expected interaction between the pile groups. The results of flow field simulation showed that Reynolds number and the pile spacing are the most influential variables in forming vortices. The flow around tandem pile and the downward flow around wake vortices were more intense and complicate in comparison with side by side arrangements and single pile.

Wykorzystanie analizy obrazu do rozpoznawania struktur przepływu dwufazowego gaz–ciecz w złożu dwuwymiarowym

63%

Masiukiewicz M. , Zając D. , Ulbrich R.

tom T. 22, z. 3D

917--922

Praca stanowi ocenę możliwości zastosowania metody analizy obrazu w odniesieniu do przepływu dwufazowego gaz-ciecz w złożu dwuwymiarowym. Idea zaproponowanej metody opiera się na analizie zmian poziomu szarości zarejestrowanych kamerą video struktur przepływu w czasie. Natomiast zmiana poziomu szarości to w praktyce zmiana udziału objętościowego fazy ciekłej i gazowej.

This paper reports results of the use of image analysis method applied to two-phase gas-liquid flow in two-dimensional bed. Idea of proposed method is based on gray level value change of recorded flow structures by CCD camera. The change of gray level value is the change of volume fraction of liquid and air phase.

Some problems of hydrodynamics of two-phase flow mixtures in minichannels

63%

Wengel M. , Miłaszewicz B. , Ulbrich R.

tom Vol. 35, no. 2

93--101

Gas-liquid two-phase flow in minichannels has been the subject of increased research interest in the past few years. Evaluation, however, of today's state of the art regarding hydrodynamics of flow in minichannels shows significant differences between existing test results. In the literature there is no clear information regarding: defining the boundary between minichannels and conventional channels, labelling of flow patterns. The review of literature on the hydrodynamics of gas-liquid flow in minichannels shows that, despite the fact that many research works have been published, the problem of determining the effect of diameter of the minichannel on the hydrodynamics of the flow is still at an early stage. Therefore, the paper presents the results of research concerning determination of flow regime map for the vertical upward flow in minichannels. The research is based on a comprehensive analysis of the literature data and on the research that has been carried out. Such approach to the mentioned above problems concerning key issues of the two-phase flow in minichannels allowed to determine ranges of occurrence of flow structures with a relatively high accuracy.