Tidligere arrangementer - Side 127

Volume tracking is a popular method for the computation of two phase flow problems. In this talk we present a reformulation of volume tracking in two dimensions in terms of an explicit tracking of the interface between the two immiscible phases. This allows for a higher order accurate representation of the interface with respect to the spatial discretization while conserving the mass up to roundoff precision.

Joris Verschaeve is postdoc at the Mechanics Division, Department of Mathematics, University of Oslo.

Seminaret finner sted torsdager 10.15 - 12.00, rom B 63 i Niels Henrik Abels hus

Ocean Engineering (OE) is considered by many to be a matured field which is mainly controlled by the oil industries. However, due to the growing interdiciplinary nature of OE, it presents new exciting challenges for scientists and engineers with a solid background in topics like hydrodynamics, acoustics, physio-chemistry as well as electro-kinetics, electromagnetics and control theory. Some practical examples will be discussed.

Touvia Miloh is professor at Tel Aviv University.

Dr. Francois Durand ved Dep. of Zoology, University of Johannesburg vil holde gjesteforelesningen:

The importance of the Karoo fossils of South Africa and our understanding of Gondwanaland and the origin of mammals. 

Patrick Couvreur, Universit¨¦ Paris-Sud, UMR CNRS 8612, Chatenay-Malabry, France

Friday seminar by James C. Bartholomew

Foredragsholder: Dr. Philip Rasch, Pacific Northwest National Laboratory, USA

Tittel: Exploring Geo-engineering Using Climate and Detailed Modelling Strategies

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 ¨C Israel Institute of Technology.

CEES Extra seminar by Daniel Ruzzante

Friday seminar by Karen Wiltshire

Friday seminar by Frank Johannes

Cathrine Wahlstr?m Tellefsen, Fysisk institutt, UiO

Partnerforums tredje m?te i ?konomistyringsnettverket.

Hvilke konsekvenser har Norges ?konomiske situasjon for arbeidet med effektivisering og gjennomf?ring av reformer i forvaltningen? Vi ?nsker ? utforske hvordan bruk av insentiver i offentlig sektor kan bidra til mer effektive tjenester, og hvordan insentiver kan konstrueres for ? st?tte opp under politiske m?l.  

Kjetil R?ysland, Avdeling for biostatistikk, Universitetet i Oslo, skal snakke om

Evaluation of counterfactual interventions in epidemiology

Tomi Koivisto (Utrecht University)

Kaffe og kaker fra kl 10!

CEES Extra seminar by Samuel Subbey

Friday seminar by Yves Van de Peer (Note the time!)

Fredagskollokvium

Fredagskollokvium

Simulations of Fluid-Solid interactions (FSI) are becoming more common as faster computers enables the study of larger models including both fluids and solids. In many applications it is of significant importance to determine the impact that a flowing fluid has on the mechanical structure surrounding it. Vortex-induced vibrations can give structural failure due to fatigue, but it can also produce undesired acoustic noise. During the seminar, several examples of FSI problems and solutions will be demonstrated. The examples include the study of flow induced vibrations in a compressor exhaust, the dynamic flow of oil through a filter, the impact of water waves on a submerged object, etc.

Large-eddy simulations are also advancing in the industrial CFD society. RANS modeling has shown to be insufficient in many complex flow situations, and LES has proven to provide answers to many fundamental questions in turbulent flows. A brief demonstration  of an example with flow over a wing profile is presented. Using LES, it is possible to extract valuable information regarding lift, drag, etc., but it is also possible to visualize the turbulent structures evolving from the boundary layer on the wing.

Love H?kansson is at EDR - Engineering Data Resources

Fredagskollokvium

Arvid Raknerud, Statistisk Sentralbyr?, skal snakke om

Indirect inference methods for stochastic volatility models based on non-Gaussian Ornstein-Uhlenbeck processes

Friday seminar by R. J. Scott McCairns