Changes between Version 159 and Version 160 of doc/app/particle_parameters

Timestamp:

Jun 12, 2017 11:50:22 AM (8 years ago)

Author:

schwenkel

Comment:

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doc/app/particle_parameters

@@ -768 +768 @@
 }}}
 {{{#!td
-Switch on/off splitting algorithm for cloud droplets (if [../inipar#cloud_droplets cloud_droplets]=.T.). If '''splitting''' is set .TRUE. every time step the splitting algorithm is executed. The algorithm split particles which fulfill certain criterion's into several super droplets with a reduced number of represented particles of every super droplet. The splitting algorithm can be steered by the following parameters: [#max_number_particles_per_gridbox max_number_particles_per_gridbox], [#radius_split radius_split], [#splitting_factor splitting_factor], [#splitting_factor_max splitting_factor_max], [#splitting_function splitting_function], [#splitting_mode splitting_mode] and [#weight_factor_split weight_factor_split]. This mechanism allows an improved representation of the right tail of the drop size distribution with a feasible amount of computational costs. The limits of particle creation should be chosen carefully! The idea of this algorithm is based on Unterstrasser and Soelch, 2014.  
+Switch on/off splitting algorithm for cloud droplets (if [../inipar#cloud_droplets cloud_droplets]=.T.). If '''splitting''' is set .TRUE. every time step the splitting algorithm is executed. The algorithm split particles which fulfill certain criterion's into several super droplets with a reduced number of represented particles of every super droplet. The splitting algorithm can be steered by the following parameters: [#max_number_particles_per_gridbox max_number_particles_per_gridbox], [#radius_split radius_split], [#splitting_factor splitting_factor], [#splitting_factor_max splitting_factor_max], [#splitting_function splitting_function], [#splitting_mode splitting_mode] and [#weight_factor_split weight_factor_split]. This mechanism allows an improved representation of the right tail of the drop size distribution with a feasible amount of computational costs.\\
+
+'''Remark:'''\\
+The calculation of all physical process (e.g. advection, diffusional growth and collision) depends on the number of simulated particles.  Therefore, '''splitting''' = .T. may significantly increase CPU time of simulations. Furthermore, the creation of new particles will lead to an increased storage capacity and you may will run out of memory. Due to this reason, the limits of the splitting algortihm should be chosen very carefully.
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