Creating spaces and cultivating mindset for transdisciplinary learning and experimentation: Pathways beyond the International Transdisicplinarity Conference 2021

This Special Focus highlights the potential of transdisciplinary research and learning to confront the complexity of the challenges facing society today. By serving as a bridge between science, practice and society, transdisciplinarity can be a means to help foster collaboration between diverse actors, question existing paradigms of knowledge co...

Statistical wave properties in shallow water using cnoidal theory

Various properties of wind-generated waves in coastal regions are significantly different from those in deep water regions. The differences are largely due to the influence of bathymetry, which is more pronounced in shallower water. In general, deep water waves are considered a Gaussian random process with only minor discrepancies between the...

The 3D effects of a vertical-axis wind turbine: Rotor and wake induction

This paper deals with the 3D effects of a vertical-axis wind turbine caused by the tip vortices. In this study, the VAWT rotor is simplified by the infinitely bladed actuator cylinder concept. The loads are prescribed to be uniform and normal to the surface and are distributed between the upwind and downwind half. Depending on the load...

Comparison of 3D aerodynamic models for vertical-axis wind turbines: H-rotor and Phi-rotor

Since the first commercial projects, the development of vertical-axis wind turbines (VAWTs) has been impeded by the limited understanding and inability to accurately model VAWTs. This paper investigates and compares different aerodynamic modelling techniques for VAWTs in 3D. All considered models are using the same blade-element...

Towards the understanding of vertical-axis wind turbines in double-rotor configuration

Vertical-axis wind turbines (VAWTs) in double-rotor configuration, meaning two rotors in close proximity, have the ability to enhance the power performance. In this study, we work towards the understanding of vertical-axis wind turbines in double-rotor configuration. Numerical simulations are performed to gain insight in the physics behind...

Modeling of a semisubmersible floating wind platform in severe waves

Floating offshore wind platforms may be subjected to severe sea states, which include both steep and long waves. The hydrodynamic models used in the offshore industry are typically based on potential-flow theory, and/or Morison's equation. These methods are computationally efficient, and can be applied in global dynamic analysis considering...

Outcomes of the DeepWind conceptual design

DeepWind has been presented as a novel floating offshore wind turbine concept with cost reduction potentials. Twelve international partners developed a Darrieus type floating turbine with new materials and technologies for deep-sea offshore environment. This paper summarizes results of the 5 MW DeepWind conceptual design. The concept was...

Sub-cavitating propeller design for high powered small craft