Movie Gallery

Animations contained on this page are examples from different projects that have been carried out by the PALM group at IMUK? in the past. Most sequences have been created with the PArallelized LES Model (PALM) using a distributed virtual reality software system (DSVR) for graphic output. In contrast with other graphic software, DSVR is parallelized and is running embedded in PALM (i.e. no graphic post-processing is done). This method avoids output of raw data (in the order of 10-100 GByte per timestep for large model runs). Instead, only graphic primitives are stored and replayed using streaming server technology. Depending on the available graphic hardware, also stereoscopic views can be created. For further details of DSVR see ​here. Recently we also started to create movies with ​NCL and ​VAPOR. Therefore we will extent this section in near future.

For each animation, a short description of the displayed scene and some general setup information for the respective model run are given.

All visualization data (images, movies) is protected by copyright.

Available movies in Gallery:

• Convective boundary layer with horizontally homogeneous heating (2001-2010, 5 movies)
• Kármán vortex street (2009, 2 movies)
• Flow over an ice lead (2006, 1 movie)
• Flow around a single cube (2005, 2 movies)
• Urban neighbourhood LES (Hanover, Tokyo, Hong Kong, 2006-2008, 3 movies)
• Mixing in the entrainment zone (2011, 2 movie)
• LES of Cumulus clouds (2012, 3 movies)

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Latest movies: Showcase

Dust devils in the convective boundary layer (2012)

Responsible: Fabian Hoffmann?, Björn Maronga? Description: This sequence shows the development of a large dust devil during a time period of 10 minutes. The dust devil is made visible by a passive scalar which is advected by the flow. The surface flux of the passive scalar is calculated by a simple parametrization of the saltation process which depends on the friction velocity (White, 1979). Due to uncertainties in the parametrization of the surface flux, the displayed concentrations of the passive scalar are in arbitrary units. Dust concentrations in the order of magnitude of 0.1 g/m3 have been found for dust devils in field measurements (Renno et al., 2004). Model Setup Total domain size (x|y|z): 768m x 768m x 945m Grid spacing (x|y|z): 1m x 1m x 1m Number of grid points (x|y|z): 768 x 768 x 832 Simulated time: 3h CPU-time: 24h Number of CPUs: 2048 Machine/ processor type: SGI Altix ICE at HLRN Visualization software: VAPOR