Changes between Version 38 and Version 39 of doc/app/runtime_parameters

Timestamp:

Sep 13, 2010 3:11:59 PM (15 years ago)

Author:

weinreis

Comment:

--

doc/app/runtime_parameters

@@ -99 +99 @@
 By default, with parallel runs, processors output only data of their respective subdomains into seperate local files (file names are constructed by appending the four digit processor ID, e.g. <filename>_0000, <filename>_0001, etc.). After PALM has finished, the contents of these individual files are sampled into one final file using the program {{{combine_plot_fields.x}}} (to be started e.g. by a suitable OUTPUT command in the '''mrun''' configuration file).\\\\
 Alternatively, PALM is able to collect all grid points of a cross section on PE0 before output is done. In this case only one  output file ([[DATA_2D_XY_NETCDF]], etc.) is created and {{{combine_plot_fields.x}}} does not have to be called. In case of very large numbers of horizontal gridpoints, sufficient memory is required on PE0.  This method can be used by assigning [[data_output_2d_on_each_pe]] = ''.F.''.\\\\
-3d volume data output is always handled seperately by each processor so that {{{combine_plot_fields.x}}} has to be called anyway after PALM has been finished.
+3d volume data output is always handled seperately by each processor so that {{{combine_plot_fields.x}}} has to be called anyway after PALM has been finished.\\\\
+'''Old formats:'''\\\\
+Beside the NetCDF format, 2d cross section data and 3d volume data can also be output, for historical reasons, in a different (binary) format using parameter [[data_output_format]].\\\\
+By assigning '''data_output_format''' = '' 'avs' '', the 3d volume data is output to the local file PLOT3D_DATA. Output is in FORTRAN binary format readable by the plot software AVS.  The order of data on the file follows the order used in the assignment for data_output (e.g. data_output = 'p', 'v',...  means that the file starts with the pressure data, followed by the v-component of the velocity, etc.). Both instantaneous and time averaged data are written on this file! Additional to this file, PALM creates a second binary file (local name PLOT3D_COOR) with coordinate information needed by AVS. As third and fourth file two ASCII files are created (AVS-FLD-format, local name PLOT3D_FLD and PLOT3D_FLD_COOR), which describe the contents of the data file and/or coordinate file and are used by AVS. However, AVS expects the content description in one file. This needs the local file PLOT3D_FLD_COOR to be appended to the file PLOT3D_FLD (by suitable OUTPUT command in the mrun configuration file: “cat PLOT3D_FLD_COOR >> PLOT3D_FLD”) after PALM has finished. To reduce the amount of data, output to this file can be done in compressed form (see do3d_compress). Further details about plotting 3d volume data with AVS can be found in chapter 4.5.5.
 }}}
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