Surface tension and rheology: Calibrating the surface tension in SPH independently of the fluid rheology

Spray drying operations can be used to turn products, like for example milk or yeast extract, into powders, extending their shelf life. The properties of those powders (e.g. density or particle size) after spray drying operations depend severely on the dynamics of droplet collisions inside the spray. Currently, costly and wasteful production...

Horizontal shear flows over a streamwise varying bathymetry

The Eastern Scheldt storm surge barrier is an icon of Dutch hydraulic engineering. Downstream of the barrier, large local erosion pits (scour holes) have formed adjacent to the applied bed protection after its construction. It was expected during the design phase that these would develop, but both the magnitude of the scour hole depth as well as...

Suppression of vertical flow separation over steep slopes in open channels by horizontal flow contraction

Flow separation and its control have been the subject of intensive research for decades. Flow separation occurs when the boundary layer loses contact with the associated confining wall, which is usually caused by a pressure gradient acting against the local flow direction. Numerous strategies exist to control flow separation, and in this...

Observations and Analysis of the Horizontal Structure of a Tidal Jet at Deep Scour Holes

Scour in the vicinity of a hydraulic structure may compromise its geotechnical stability or that of nearby structures. Much fundamental research has been dedicated to the understanding and prediction of these processes, in order to enable the efficient design of mitigation measures. While most of these efforts consider laterally uniform flows,...

Pollutants in mangrove ecosystems: A conceptual model for evaluating residence time

Mangroves are extremely important from the ecological and socio-economic perspectives, but are degrading at an alarming rate nowadays. Besides direct clearance, hydrological alterations or climatic changes, chemical pollution could be a significant contributor of mangrove degradation. To understand chemical pollution in mangroves, the input and...

Modelling of Grain Sorting Mechanisms in the Nearshore Area for Natural and Nourished Beaches

In this study a modelling approach was investigated that takes into account the effect of short wave grouping on long wave motions, calculating sediment transport and morphology with multiple fractions and a layered bed stratigraphy. After extensive testing and validating this model using data collected in a wave flume in Hannover this model was...

Hydrodynamic modelling of a mangrove system in Singapore

Modelling tidal dynamics in mangrove systems is of great use in studying effects of vegetation on flow and may prove to be a useful tool to support the management of mangrove areas. Since there are lots of limitations on obtaining field data inside mangrove forests, numerical models are indispensable to analyse the effects of changes in mangrove...