Kármán vortex street
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Kármán vortex street I (2009)
Project: LES of Kármán vortex streets in the atmospheric boundary layer
Responsible: Rieke Heinze?
Description: Atmospheric vortex streets consist of two rows of counterrotating mesoscale eddies with vertical axis in the wake of large islands. They resemble classical Kármán vortex streets which occur in laboratory experiments behind a cylinder. Usually, atmospheric vortex streets can be found in the stratocumulus capped mixed layer over the ocean when there is a strong elevated inversion well below the island top.
In the animations the island consists of a single Gaussian shaped mountain with a height of about 1.3 km and a base diameter of about 12km. Particles are released in one layer and act as passive tracers. Their vertical motion is disabled. The colour of the particles reflects the difference between the temperature at the respective particle position and the mean temperature, horizontally averaged over the total domain. Blue/red colours represent a relatively low/high temperature. The animation shows that the cores of the eddies are warmer than the environment. The length of the animation corresponds to about 14h real time.
| Model Setup | |
|---|---|
| Total domain size (x|y|z): | 144km x 60.8km x 3.8km |
| Grid spacing (x|y|z): | 100m x 100m x 100m |
| Number of grid points (x|y|z): | 1440 x 608 x 32 |
| Simulated time: | 14h |
| CPU-time: | 1.1h |
| Number of CPUs: | 256 |
| Machine/ processor type: | SGI Altix ICE at HLRN / Intel XEON Harpertown |
| Visualization software: | DSVR |
| Download | ||
|---|---|---|
| Video Format | File size | |
| Flash (.flv) | 10.0mb | Download (top view) |
| MPEG (.avi) | 17.1mb | Download (top view) |
Kármán vortex street II (2009)
Project: LES of Kármán vortex streets in the atmospheric boundary layer
Responsible: Rieke Heinze?
Description: The same animation as above but from a side view.
| Model Setup | |
|---|---|
| Total domain size (x|y|z): | 144km x 60.8km x 3.8km |
| Grid spacing (x|y|z): | 100m x 100m x 100m |
| Number of grid points (x|y|z): | 1440 x 608 x 32 |
| Simulated time: | 14h |
| CPU-time: | 1.1h |
| Number of CPUs: | 256 |
| Machine/ processor type: | SGI Altix ICE at HLRN / Intel XEON Harpertown |
| Visualization software: | DSVR |
| Download | ||
|---|---|---|
| Video Format | File size | |
| Flash (.flv) | 9.9mb | Download (side view, 50fps) |
| MPEG (.avi) | 9.9mb | Download (side view, 50fps) |
