Danish Ph.D. School in Nonlinear Science

Sponsored by the Danish Research Academy

European Science Foundation Programme on Transport in Atmospheres and Oceans Workshop:
Coherent Structures and Transport
Wednesday October 29 - Saturday November 1, 1997
at Optics and Fluid Dynamics Department, Risø
Organizer: Jens Juul Rasmussen


Wednesday October 29, 1997

09.00-10.00 Registrations
10.00-10.30 Opening remarks
J.-P. Lynov: Introduction to Risø
10.30-11.15 G. J. F. van Heijst: Advection properties of perturbed and interacting vortices
11.15-11.40 Coffee
11.40-12.25 J. Weiss: Coherent vortices in three dimensional quasi-geostrophic turbulence
12.30-13.30 Lunch
13.30-14.15 J. Nycander: Vortex dynamics on the beta-plane
14.15-15.00 R. Pasmanter: Critical review of statistical-mechanical approach to quasi-stationary states in 2D flows
15.00-15.30 Coffee
15.30-16.00 H. Brands: Maximum entropy versus minimum enstrophy predictions for 2D, incompressible, nearly inviscid flows, evolving from large scale initial structures
16.00-16.30 Preben Alstrøm: Fractal particle trajectories in capilary waves
16.30-17.15 Discussions on the day's theme. Planning the following discussions
17.15 Get together beer

Thursday October 30, 1997

09.00-09.45 R. Verzicco: Dynamics of a vortex ring in a rotating environment
09.45-10.30 H. Clercx: Quasi - 2D vortex dominated flows in containers with rigid boundaries
10.30-10.55 Coffee
10.55-11.40 J. Weiss: Lagrangian dynamics in a system of point vortices
11.40-12.25 A. H. Nielsen: Particle transport across a circular shear layer with coherent structures
12.30-13.30 Lunch
13.30-14.00 O. Ben Mahjoub: Scaling exponents in nonhomogeneous flow
14.00-14.30 I. Mortazavi: Study of vorticity formation and transport in confined flows using vortex methods
14.30-15.00 V. Naulin: Numerical study on global and local influence of structures in a 2D flow on particle transport
15.00-15.20 Coffee
15.20-17.30 Laboratory visit, discussions

Friday October 30, 1997

Theme: Laboratory experiments

09.00-09.45 D. Etling: Dispersion of passive tracers due to a vortex pair in stratified flows
09.45-10.30 Y. Chashechkin: Coherent vortex structures in a 2D stratified wake as transport barriers (short and long time inspection) - some theoretical basis and laboratory experiment
10.30-10.55 Coffee
10.55-11.40 J. Konijnenberg: Vortex structures and particle transport in a shear layer in 2D quasi-geostrophic flows
11.40-12.25 P. Petitjeans: Experiment on vortex stretching
12.30-13.30 Lunch
13.30-14.00 B. Stenum: Collapse of a vortex ring in a stratified fluid
14.00-14.30 M. Beckers: Axisymmetric vortex motion in a linearly stratified fluid
14.30-15.00 A Stegner: Dynamical behavior of large-scale vortices beyond the deformation radius
15.00-15.30 A. E. Hansen: Two-dimensional turbulence and dispersion in a freely decaying system
15.30-16.00 Coffee
16.00-17.30 Discussions

Saturday October 31, 1997

09.30-10.15 T. Mikkelsen: Atmospheric dispersion: Field measurements and analysis
10.15-11.00 H. Lustfeld: A 2D model for chemical reactions due to a pollutant source
11.00-11.30 Coffee
11.30-12.15 N. Edwards: Equatorial Pacific eddies in a numerical ocean model
12.20-13.30 Lunch
13.30-14.00 M. Schmidt: Particle dispersion in monopolar structures in quasi-geostrophic flows
14.00-14.30 V. Wirth: Coherent tropopause structures?
14.30-15.00 Coffee
15.00-16.30 Discussions, final discussion, closing
19.00 Dinner