Changes between Version 122 and Version 123 of doc/app/particle_parameters

Timestamp:

Apr 10, 2014 3:20:52 PM (11 years ago)

Author:

hoffmann

Comment:

--

doc/app/particle_parameters

@@ -7 +7 @@
 |----------------
 {{{#!td style="vertical-align:top; text-align:left;width: 150px"
+[=#alloc_factor '''alloc_factor''']
+}}}
+{{{#!td style="vertical-align:top; text-align:left;style="width: 50px"
+R
+}}}
+{{{#!td style="vertical-align:top; text-align:left;style="width: 75px"
+20.0
+}}}
+{{{#!td
+Factor (in percent) describing the memory allocated additionally to the memory needed for initial particles at a given grid cell. For example, 100 particles are initialized at a grid cell. Hence, an array for 120 particles (default value of alloc_factor) is allocated providing sufficient memory for particles being transported to this grid cell during the simulation. Note that this array is automatically reallocated if more than 120 particles (following the example above) are transported to this array in order to provide sufficient memory. Thus, it is not necessary to choose alloc_factor too high.
+}}}
+|----------------
+{{{#!td style="vertical-align:top"
 [=#dt_prel '''dt_prel''']
 }}}
-{{{#!td style="vertical-align:top; text-align:left;style="width: 50px"
-R
-}}}
-{{{#!td style="vertical-align:top; text-align:left;style="width: 75px"
+{{{#!td style="vertical-align:top"
+R
+}}}
+{{{#!td style="vertical-align:top"
 9999999.9
 }}}
@@ -229 +242 @@
 Temporal interval for sorting particles (in s).\\
 By default, particles are sorted in memory in a way that their order follows the order in which the gridpoint values are stored. This may improve cache coherence in case of larger numbers of particles and gridpoints. However, since the sorting itself is time consuming and since the requirement of sorting depends on the strength of mixing in the flow, performance can be improved if the sorting is applied only after certain time intervals. The proper length of this interval '''dt_sort_particles''' must be determined empirically by carrying out test runs with different intervals. Check file [../iofiles#CPU_MEASURES CPU_MEASURES] to find the value of '''dt_sort_particles''' which gives the best performance.\\\\
-'''Note:''' In case of [../inipar#cloud_droplets cloud_droplets] = '' '.T.' '', any given non-zero value of '''dt_sort_particles''' will be reset to zero and a corresponding warning message will appear in the job protocol.
+'''Note:''' In case of [../inipar#cloud_droplets cloud_droplets] = '' '.T.' '', any given non-zero value of '''dt_sort_particles''' will be reset to zero and a corresponding warning message will appear in the job protocol.\\\\
+'''Not available from release 4.0 on.'''
 }}}
 |----------------
@@ -287 +301 @@
 Maximum number of particles (on a PE). \\
 This parameter allows to set the number of particles for which memory must be allocated at the beginning of the run. If this memory becomes insufficient during the run, due to the release of further particles (see [#dt_prel dt_prel]), then more memory is automatically allocated.
-For runs on several processors, maximum_number_of_particles defines the maximum number on each PE. This number must be larger than the maximum number of particles initially released in a subdomain.
+For runs on several processors, maximum_number_of_particles defines the maximum number on each PE. This number must be larger than the maximum number of particles initially released in a subdomain.\\\\
+'''Not available from release 4.0 on.'''
 }}}
 |----------------
@@ -335 +350 @@
 }}} 
 |----------------
+|| [../parpar#min_nr_particles min_nr_particles] || P || particles || I || 50 || Minimum number of particles for which memory is allocated at each grid cell. ||
+{{{#!td style="vertical-align:top"
+[=#min_nr_particle '''min_nr_particle''']
+}}}
+{{{#!td style="vertical-align:top"
+I
+}}}
+{{{#!td style="vertical-align:top"
+50
+}}}
+{{{#!td
+Minimum number of particles for which memory is allocated at every grid cell.
+}}} 
+|----------------
 {{{#!td style="vertical-align:top"
 [=#number_of_particle_groups '''number_of_particle\\_groups''']
@@ -647 +676 @@
 '''Note:''' For parallel runs files may become very large and performance of PALM may decrease.
 }}}
-
-