Previous events - Page 30

Ingeborg Gjerde (Simula Research Laboratory) presents joint work with Ridgway Scott (University of Chicago).

Abstract: Airflow around airplane wings is characterized by a wide range of flow scales, making it highly challenging to capture numerically. From a simulation viewpoint, the following questions are still being actively investigated: Why do airplanes fly? Can one reliably simulate the lift and drag of an airplane wing? In this talk, I will provide no good answers to these questions. Instead, I want to talk about some interesting results I've stumbled into tangentially, including:
- (Nonlinear) kinetic energy instability analysis, also referred to as Reynolds-Orr instability
- Slip boundary conditions and their connection to D'Alembert's paradox
- Stokes' paradox and its connection to weighted Sobolev spaces. I will show numerical results computed for flow around a cylinder, which serves as a proxy for flow around an airplane wing. In particular, I will talk about the impact of the friction boundary condition on the drag force and flow stability. Finally, I will comment on how these results might be interpreted in view of: New Theory of Flight, J. Hoffman, J. Jansson, C. Johnson (2016), Journal of Mathematical Fluid Mechanics.

Lars Frogner, PhD fellow of Rosseland Centre for Solar Physics (RoCS), University of Oslo.

Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.

The variety of sums of powers, VSP(F, r) of a homogeneous form F of rank r is the closure in the Hilbert scheme of apolar schemes of length r. A bad limit is a scheme in the closure that is not apolar to F. I will discuss examples of bad limits, including examples for quadrics found by Joachim Jelisiejew that contradicts earlier results on polar simplicies. This is report on work in progress with Jelisiejew and Schreyer and with Grzegorz and Michal Kapustka.

Title: Mixed-phase clouds: Insights from observations and modelling

Speaker: Ulrike Lohmann, ETH Zürich

Learn about CRediT - a new international standard for transparent assignment of individual research contributions.

We invite you to the November RoCS Solar/Stellar Lunch. You are invited to discuss your work with colleagues.

SPARK Norway Educational Forum are monthly open meetings organized by UiO:Life Science and SPARK Norway partners.

Join us at the department’s research seminar on 21. November, with the timely topic Digital Twins: An Emerging Paradigm for Model-Centric Engineering, given by our colleague Einar Broch Johnsen.

Welcome to our GEOHYD Lunch Seminar Friday 18th of November @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Andreas Aspaas, UiO GEO/Njord.

Maksym Brilenkov, PhD student at Institute of Theoretical Astrophysics, University of Oslo.

Counterexamples to the integral Hodge conjecture can arise either from torsion cohomology classes (as in Atiyah's and Hirzebruch's original counterexample from 1961) or from non-torsion classes (as first seen in Kollár's counterexample from 1991). After Voisin proved the IHC for uniruled threefolds, Schreieder found a unirational fourfold where the IHC fails. His construction of a non-algebraic Hodge class relies on abstract arguments with unramified cohomology. It was an open question whether this class is of torsion type. In this talk, I want to explain a new method that gives an explicit geometric description of the unramified cohomology class appearing in his argument. In particular, this approach allows to prove that Schreieder's unirational counterexample is of torsion type.

***Cancelled***: TBD

Speaker: Richard Forbes, ECMWF

Felleskollokvium ved Øyvind Guldbrandsen.

Title: Tipping of the Atlantic Ocean Circulation 

Speaker: Henk A. Dijkstra, Utrecht University 

Between Failure And Hope: Experiences Of Digital Technologies For Engaging With Health Inequities In The Global South is the title of the Distinguished Speaker Lecture hosted by DOS Research Centre.

A three-day school for master and PhD students in physics, mathematics and computer science who would like to learn about quantum computing.

Welcome to our GEOHYD Lunch Seminar Friday 11th of November @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Andreas Köhler, NORSAR.

In this talk, I will go through my past research before joining UiO, particularly at The University of Texas at Austin. This will include a brief introduction to the development of stable and adaptive finite element methods for challenging problems in engineering science. Second, I will focus on modeling efforts in coastal ocean hydrodynamics, including a review of the underlying physics and assumption and a review of the current state-of-the-art. I will also introduce several related to my focus of storm surge modeling and how the models are used by stakeholders beyond academia. 

Renate Mauland-Hus, PhD student at Institute of Theoretical Astrophysics, University of Oslo.

Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.