Reformatting data with mb_post

The postprocessor mb_post may be used to reformat the flow solution to the TECPLOT, EnSight, MATLAB or GENERIC format or it can be used to "probe" the flowfield at specified points. The program is controlled via command-line arguments.

% mb_post.exe [-fp parameter_file] [-fg grid_file] 
              [-fs solution_file] [-fo output_file] 
              [-t time] [-all]
              [-tecplot|-generic|-vtk|-ensight|-matlab|-save|-split]
              [-rb] [-wb] [-rsplit]
              [-mirror] [-logrho] [-logp]
              [-xmin xmin] [-xmax xmax]
              [-ymin ymin] [-ymax ymax]
              [-nx nx] [-ny ny]
              [-probe x y]
              [-help]

-fp parameter_file

Input parameter file name. Default is "default.p".

-fg grid_file

Grid file name. Default is "default.g".

-fs solution_file

Flow solution file name. Default is "default.s".

-fo output_file

The reformatted data is written to files whose names have been constructed from this string. Default is "post_out".

-t time

Solution time that is desired. Default value is 0.0 If there are multiple times in the solution file, solutions will be read and either discarded or written until this specified time is exceeded.

-all

Request that all solutions be written up until the specified final time. To distinguish different solutions, a time tag is included in the output file name. This tag is of the form _0000nnnn where nnnn represents the time in microseconds. There are 8 digits in the time tag which is zero-filled from the left. This should allow the written files to be easily sorted in time order. If the -all flag is not specified, solutions will be simply discarded and no time tags will be added to the output name.

-tecplot|-generic|-vtk|-ensight|-matlab|-save|-split

Format for the output; choose one. Default is none.
For -vtk,-tecplot and -generic, all of the flow data is kept together. For -matlab and -ensight, each flow property is written to a separate file. The MATLAB files contain data on a regular grid, with the file for each flow variable contains an matrix of values written in ASCII. All other formats write the flow data at the centres of the original (body-fitted) cells.
The -save option writes the data out in the same format as found in the solution file. This option is useful for extracting a single solution time for restarting the integration process.
To output the solution, one block per file, use -split. Individual blocks will be written to files with names output_file.block.jb where jb is the block index.

-rb

Read binary (unformatted) data from the grid and solution file. By default, ASCII formatted data will be assumed.

-wb

Write the "saved" file as binary data. By default, ASCII formatted data will be written. Data formatted for the plotting packages are always in ASCII.

-rsplit

Read data from split grid and solution files. By default, data will be assumed to come from the one (unsplit) file.

-mirror

Copy the data to produce a mirror image. Default is not to produce a mirror image.

-logrho

Take log10 of density field. Default is to retain the linear density range.

-logp

Take log10 of pressure field. The default is to retain the linear pressure range.

-probe x y

Print (to standard output) flowfield data for the point (x,y). Several points may be specified, but only one per -probe flag.

-xmin xmin -xmax xmax -ymin ymin -ymax ymax

The limits for generating sample points. Any combination may be specified. Limits that are not specified by the user will be inferred from the grid data.

-nx nx -ny ny

Number of increments in each of the x- and y-directions for the MATLAB data. The default is 10 for each.

-q

Print the usage hints to the console and the log_file.

The usual application of mb_post is for reformatting data for subsequent plotting, however, it can be used to extract (and save) a particular solution time so that a simulation can be restarted.