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Project: none
Responsible: Siegfried Raasch?
Description:
Turbulent flow around a city quarter of Hannover. The mean flow is from west (right) with a speed of 1 m/s (neutral stratification is assumed). Clouds of particles are periodically released in front of the large building (Allianz tower) and in the courtyard of another complex of buildings. The particle color reflects the height above ground (red: high, blue: low). Topography data are from laser altimeter measurements (kindly provided by the Institut für Kartographie und Geoinformatik, Leibniz Universität Hannover). The resolution of the laser data allows to resolve cars on the street west of the Allianz building, staying there because of a red traffic light. The sequence shows that the turbulent flow within street canyons is highly variable so that flow directions may change completely within short times.
| Model Setup
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| Total domain size (x|y|z): | 256m x 256m x 200m
| | Grid spacing (x|y|z): | 1m x 1m x 1m
| | Number of grid points (x|y|z): | 256 x 256 x 200
| | Simulated time: | 1h
| | CPU-time: | 1800s
| | Number of CPUs: | 32
| | Machine/ processor type: | IBM-Regatta / Power4
| | Visualization software: | DSVR
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| Download
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| Video Format | File size
| | Flash (.flv) | 8.3mb | Download
| | MPEG (.avi) | 8.3mb | Download
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