Karman modes observation through numerical simulations. These simulations are performed with FREEFEM++. I use a penalisation method to simulate the obstacle in a an air flow coming from left. Note that these calculations are only preliminary. This work is a collaboration with Didier Bresch (LMA - Grenoble) and Iulian Cotoi (Ecole Polytechnique de Montreal). Movies are compressed with MPEG.

K mode with w/W = 0

K mode with w/W = 2

Some new calculations based on different boundary conditions, with different oscillation speeds for the obstacle (0 Hz, 10 Hz and 20 Hz).

Non oscillating cylinder

10 Hz frequence

20 Hz frequence