= PALM - A '''PA'''rallelized '''L'''arge-Eddy Simulation '''M'''odel for Atmospheric and Oceanic Flows =
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PALM is a large-eddy simulation (LES) model for atmospheric and oceanic flows which is especially designed for performing on massively parallel computer architectures. PALM is free software. It can be redistributed and/or modified under the terms of the GNU General Public License (v3).
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<a href='gallery/movies1'>
<embed
    type="application/x-shockwave-flash"
    id="player"
    name="player"
    src="http://palm.muk.uni-hannover.de/chrome/site/gallery/player.swf" 
    width="300" 
    height="154"
    allowfullscreen="false"
    flashvars="file=http://palm.muk.uni-hannover.de/chrome/site/gallery/movies/palm_2.flv&image=http://palm.muk.uni-hannover.de/chrome/site/gallery/movies/palm_2_preview.jpg&autostart=true&controlbar=none&repeat=always"
/></a><br>
A PALM simulation using the letters "PALM" as surface heat flux pattern. Check out the <a href='http://palm.muk.uni-hannover.de/wiki/gallery/movies'>gallery</a> for more movies!
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'''Some of PALM's highlights are'''

* excellent scaling, so far tested up to 32000 cores
* online data analysis (during model runs) in order to avoid I/O bottlenecks
* topography realized on cartesian grid (allows for steep topography)
* non-cyclic horizontal boundary conditions including turbulent inflow
* code can be switched to ocean version with salinity equation and equation of state for seawater
* embedded parallelized Lagrangian particle model for various applications (footprint calculation, simulation of cloud droplet growth, visualization, etc.)
* interface which allows users to plug in their own code extensions without modifying the default code
* advanced shell scripts for installing and running the code in interactive and batch mode are available
* code is permanently maintained and improved by the PALM group and other users; code management is based on subversion

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'''PALM news'''
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   '''[ 2014/10/21 ]''' ''New code structure for the embedded plant canopy model ([[/wiki/doc/app/canpar#CanopyParameters|details]]) ''\\
   '''[ 2014/07/23 ]''' ''The PALM group has contributed a visualization to the [[http://www.vapor.ucar.edu/gallery/movies|VAPOR Gallery]] ''\\
   '''[ 2014/07/14 ]''' ''The PALM group/IMUK joined the Center for Wind Energy Research ([[http://www.forwind.de/forwind/index.php?article_id=1&clang=1|ForWind]]) ''\\
   '''[ 2014/07/07 ]''' ''The PALM group has now its own [[https://www.youtube.com/user/palmhannover|Youtube Cannel]] and a [[gallery/movies/city#macau|new visualization]] has been added to the [[gallery/movies|Gallery]]''\\
   '''[ 2014/03/19 ]''' ''PALM is now part of the SPEC ACCEL benchmark test for intensive parallel applications running under OpenACC ([[http://www.spec.org/accel/|more]]) ''\\
   '''[ 2013/10/30 ]''' ''Nudging technique implemented ([[doc/tec/nudging|see here]])''\\

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'''PALM users world map'''

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<center>
<iframe src="https://mapsengine.google.com/map/embed?mid=zBNzgE1PMF5s.kUpTNKq92b4Y" width="80%" height="400"></iframe>
</center>
}}}