Previous seminars - Page 4
Elisabeth Seland
In my job as research adviser, I receive a lot of questions about rights, possibilities and problems in connection with scientific publishing and open access. Both EU and the Norwegian Research Council have rules about this, and there is also a UiO policy in place that is relevant for all employees. I will give a short presentation to try to clear up what you have to, must, may, could and should related to Open access. In my experience many of you have the same questions about these issues, so I hope you bring your questions with you and we can address them in the seminar.
Activity at IFE Wind Energy: numerical modeling of offshore wind turbines
IFE (Institutt for Energiteknikk) is a research center located in Kjeller. The wind group at IFE mainly works with the development and analysis of new cost effective concepts for offshore wind energy, both concerning innovative rotor designs and new concepts for substructures. The group main investigation tool is the in-house software 3DFloat, an aero-elastic code which can simulate the whole wind turbine structure when exposed to the associated environmental loads (wind loads, hydrodynamic loads, soil loads if bottom-fixed).
In the presentation, an insight into the wave kinematics and wave loads modeling tools that are currently included in 3DFloat will be provided.
Experimental investigation of linear stability mechanisms in stratified gas-liquid pipe flow
The evolution of interfacial waves on a stratified air water pipe flow is investigated experimentally. An oscillating plate introduced controlled perturbations at the inlet of the pipe. High speed cameras captured the evolution of these perturbations along the pipe by means of a phase-locked shadowgraphy technique. Thereby, it was possible to measure the temporal and the spatial evolution of the disturbances introduced in the flow. Particle image velocimetry was performed further downstream in order to evaluate changes in the base flow.
A relatively large data bank has been gathered with varying air and water flow rates as well as varying amplitudes and frequencies of the inlet perturbations. Some preliminary results contain a qualitative assessment of linear vs. non-linear regimes and momentum transfer into the water layer.
Zebrafish embryos: a useful tool for the study of nanoparticle behavior in real time in a vertebrate
PIV investigation of the flow structures developing in a parallel valves Diesel engine cylinder during the intake stroke.
Victor Haughton, Professor of Radiology at the University of Wisconsin
and Adjunct Research Scientist at Simula Research Laboratory
Recent findings show that moderate mixing levels typical of mid-latitude can erode or even remove the Arctic cold halocline layer and that internal wave induced mixing is enhanced in the absence of sea ice. In a seasonally ice-free Arctic Ocean increased levels of mixing, sufficient to remove the cold halocline layer, can be expected as a result of wind energy input over large areas of open water. The ice is then easily exposed to the relatively warm Atlantic water, possibly leading to a strong positive feedback. I will report on insight gained from field work conducted during the International Polar Year. Detailed finescale and turbulence measurements were made from drifting ice in the central Arctic and in the southern Yermak Plateau located in the Marginal Ice Zone northwest of Svalbard. Observations are analyzed to describe the characteristics of internal waves and turbulent mixing in the Arctic Ocean. The role of diapycnal mixing away from abyssal plains is discussed for the Arctic Ocean and regional heat budget and ice cover.
Ilker Fer is at the Department of Geophysics at UiB
An idealized mathematical model of tsunami evolution in deep sea and across the continental shelf is proposed. The initial value problem in deep sea is related to the well known Cauchy- Poisson problem, and the tsunami propagation across the continental shelf is derived using the linearized shallow water equations.
When analyzing different cases of tsunamis in deep sea it was found that tsunamis evolve into two basic wave types. One resembles a single wave and the other a wave packet. The analysis of different cases of tsunamis at the shoreline reveals that the continental shelf, due to its geometrical properties, serves as a tsunami amplifier, producing tsunami amplitudes up to 20 times larger than those at the edge of the continental shelf.
A comparison with tsunami measurements suggests that the idealized model may be used for a reliable assessment of the principle hydrodynamic properties of the tsunami, such as the tsunami amplitude and its half- period.
The new mathematical model for tsunami evolution is used to derive a synthetic tsunami database for the southern part of the Eastern Mediterranean coast. Information about coastal tsunami amplitudes, half-periods, currents, and inundation levels is presented.
Michael Stiassnie is professor at the Department of Civil and Environmental Engineering, Technion – Israel Institute of Technology.
Environmental challenges related to hydrocarbon-based energy sources as well as resource constraints are the driving forces behind the R&D focus of StatoilHydro. In this presentation we will discuss availability of hydrocarbon energy sources and global energy demand. We will show how this motivates the research focus of StatoilHydro.
Ruben Schulkes is Chief Researcher Production Technology at StatoilHydro, Research Centre Porsgrunn, and is Professor II at the Mechanics Division