Experimental investigation of self-healing magnetorheological surface textures

Fluid bearings are applied widely in precision engineering due to their low friction compared to rolling-element bearings. The main selling points for a fluid bearing is the high load capacity and reduced vibrations. However, the bearing's lifetime is not infinite and can be improved. The performance and lifetime of bearings can be improved by...

Comparing one and two-dimensional hydraulic modelling of flow on varying spatial scales: Identifying the physical processes that are of influence to the modelling choice of a stream system

In the past years, climate change has caused an increasing number of extreme weather events. In the Netherlands this is, for instance, reflected by the growing amount of extreme rainfall events. This creates big issues for water management authorities like water boards. Water boards are often responsible for local streams, that cannot handle the...

Port and channel sedimentation: A hybrid model for rapid assessments

Maintenance dredging, as a result of port and channel sedimentation, can have a large share in overall maintenance costs of a port. A smart design can minimize the amount of maintenance dredging and thus improve the profitability of a port but also the long-term sustainability. As the preliminary design stages are often decisive for the final...

Recovery of an Autonomous Underwater Vehicle by jumping out of the water like a penguin

This reports outlines the results of an investigation into the feasibility of recovery by jumping on a platform like a penguin, compared to performance of existing recovery systems. The enquiry begins by introducing the model that has been developed to simulate the hydrodynamics of the AUV, including the implementation of water exit and orbital...

Dynamic Assessment of the Bolivar Roads Navigational Barge Gate Barrier

The devastation caused by Hurricane Ike in the Galveston Bay area (Texas, United States of America) proved the necessity of an improved water defense. Multiple flood risk reduction studies were undertaken. The Texas A&M University of Galveston proposed the Ike Dike, a fortification of the coastal spine to prevent a storm surge from entering the...

Hydrodynamic loading on the shaft of a gravity based offshore wind turbine

Gravity based support structure By a joint venture of BAM and Van Oord an innovative type of Gravity Based Structure (GBS) for an offshore wind turbine was developed. The GBS consist of a concrete caisson and a steel shaft. The applicable water depth range is between 35 and 60m. Hydrodynamic loading on the shaft In order to optimize the support...

Delft3D model of the Ayeyarwady delta Myanmar

In 2013 and 2014, a hydrodynamic model for the Ayeyarwady delta was developed. This delta is located in the Southwestern part of Myanmar. Because it is prone to flooding and is also affected by salt intrusion during periods of low river discharge, it was chosen to develop a hydrodynamic model to gain more insight into the aforementioned...

The Aero-Hydrodynamic Characteristics of Yachts Sailing Upwind in Waves

A common practice during the design of a sailing yacht is to assume an ideal environment. The wind is constant in intensity and direction and the sea is calm. In this situation, an equilibrium between the aerodynamic and hydrodynamic forces and moments can be found. The equations of equilibrium are thus solved to find the best setup (combination...

Innovative guidance structure: Technical and economical feasibility cable variant

Guidance structures are built in the vicinity of a sluice complex to serve as berth for ships waiting for the sluice to be available. The structure is loaded by the ship and should stop the ship without being damaged. The design of a guidance structure did not significantly change over the last decades. Therefore one could talk about a...

Paulina vegetation model: Current attenuation by salt marsh vegetation

The present report represents the second phase of my M.Sc. dissertation. The first phase concentrated on thorough data processing of field measurements in the Paulina Polder, see Kusters et al (2003) in Appendix A. For the present phase of my end thesis I have investigated the influence of vegetation on currents in a mudflat salt marsh ecosystem...

Hydrodynamic forces on slender cylinders oscillating transversely in a current

The study of the hydrodynamic interaction of cables has become more important in recent years since umbilical cables of more than 3000 meters length have been used when photographing the wreck of the HMS Titanic or the Bismarck. Cable vibration can cause distorting of the digital signals being transmitted as well as premature fatigue failure of...

Guyed tower offshore windmill

A guyed tower offshore windmill has been designed to utilize the much higher wind energy production possible there in comparison to onshore. It will be sited in an intermediate water depth (=75 m) of a coastal region. The feasibility for North Sea conditions for a structure with a life of 25 years has been examined. A modified design, slender...