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GPIV_VORTY(1) General Commands Manual GPIV_VORTY(1)
gpiv_vorty - Calculates the differential quantities vorticity, shear strain and normal strain from PIV data.
gpiv_vorty [-d N] [-h | --help] [-p | --print] [-g | --g] [--no_g ] [-v | --version] [filename] < stdin > stdout
gpiv_vorty calculates the differential quantities like vorticity, shear strain and normal strain from PIV data. You can choose from several
differential schemes: central differentiation, least squares, Richardson extrapolation and circulation method. Circulation method only
allows one to calculate vorticity, but no strain. The output can be generated as ASCII data containing four columns or as GNUPlot Data for-
mat that allows one to view/print the data as contour plots.
The configuration parameters (containing the POST key) may be overruled by the command line options, as explained below.
-d N Differential type to be used: central difference (N=0), least squares (N=1), Richardson interpolation (N=2), circulation method
-h | --help
-p | --print
Print parameters, command line options and eventually used input and output filenames to stdout. The output is identic of file-
name.par, in case filename is used.
-g Show contour plot of the output with gnuplot.
--no_g Suppresses to show contour plot of the output with gnuplot.
-v | --version
Print version information on standard output, then exit successfully.
Input PIV data file. Overrides stdin and stdout. The output will be written to filename.vor. Parameters are stored in filename.par
and may be used for future use by including them in ./gpivrc.
Gerber Van der Graaf
8 November 2006 GPIV_VORTY(1)