LES of cumulus clouds
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Development of cumulus clouds (2012)
Project: Investigations on in-cloud turbulence effects on drop growth and precipitation formation
Responsible: Theres Riechelmann?, Björn Maronga?
Description: This sequence shows the development of cumulus clouds at an accelerated pace in the homogeneously-heated convective boundary layer. The shown time period spans approx. 80 minutes, the shown region is of size 1.4 km x 1.4 km in the horizonzal and 1.5 km in the vertical direction. The clouds are represented through the liquid water content. Darker (gray) shades refer to a higher water content than white shades. The background scenary here is not physical and used for decorational reasons only.
| Model Setup | |
|---|---|
| Total domain size (x|y|z): | 4096m x 4096m x 1900m |
| Grid spacing (x|y|z): | 4m x 4m x 4m |
| Number of grid points (x|y|z): | 1024 x 1024 x 448 |
| Simulated time: | 2h |
| CPU-time: | 6.5h |
| Number of CPUs: | 1024 |
| Machine/ processor type: | SGI Altix ICE at HLRN |
| Visualization software: | VAPOR |
| Download | ||
|---|---|---|
| Video Format | File size | |
| Flash (.flv) | 3.9mb | Download |
| MPEG (.avi) | 3.6mb | Download |
Up- and downdrafts below a cumulus cloud (2012)
Project: Investigations on in-cloud turbulence effects on drop growth and precipitation formation
Responsible: Theres Riechelmann?, Björn Maronga?
Description: As sequence one, but a different cloud at a different location. The shown region is of size 1.0 km x 1.2 km in the horizonzal and 1.5 km in the vertical direction; the shown time period is 10 min (each time step is 0.6 s). The arrows indicate the strength and direction of the wind in a vertical plane through the center of the cloud. Red and blue colors refer for up- and downdrafts, respectively.
| Model Setup | |
|---|---|
| Total domain size (x|y|z): | 4096m x 4096m x 1900m |
| Grid spacing (x|y|z): | 4m x 4m x 4m |
| Number of grid points (x|y|z): | 1024 x 1024 x 448 |
| Simulated time: | 2h |
| CPU-time: | 6.5h |
| Number of CPUs: | 1024 |
| Machine/ processor type: | SGI Altix ICE at HLRN |
| Visualization software: | VAPOR |
| Download | ||
|---|---|---|
| Video Format | File size | |
| Flash (.flv) | 4.3mb | Download |
| MPEG (.avi) | 10.9mb | Download |
Up- and downdrafts below a cumulus cloud 3D
Project: Investigations on in-cloud turbulence effects on drop growth and precipitation formation
Responsible: Theres Riechelmann?, Björn Maronga?
Description: The third sequence shows the same cloud as sequence two, but from a different view angle. Arrows again indicate the flow circulation under the cloud (updrafts are in red colors). The bottom shows the near-surface vertical wind speed (high wind speeds in red).
| Model Setup | |
|---|---|
| Total domain size (x|y|z): | 4096m x 4096m x 1900m |
| Grid spacing (x|y|z): | 4m x 4m x 4m |
| Number of grid points (x|y|z): | 1024 x 1024 x 448 |
| Simulated time: | 2h |
| CPU-time: | 6.5h |
| Number of CPUs: | 1024 |
| Machine/ processor type: | SGI Altix ICE at HLRN |
| Visualization software: | VAPOR |
| Download | ||
|---|---|---|
| Video Format | File size | |
| Flash (.flv) | 4.2mb | Download |
| MPEG (.avi) | 10.9mb | Download |
