1 .TH GPIV_VORSTRA 1 "8 November 2006"
3 gpiv_vorstra \- Calculates the differential quantities vorticity, shear
4 strain and normal strain from PIV data.
9 [\fB-h\fR | \fB--help\fR]
10 [\fB-n\fR | \fB-o\fR | \fB-s\fR]
12 [\fB-p\fR | \fB--print\fR]
13 [\fB-g\fR | \fB--g\fR]
14 [\fB-v\fR | \fB--version\fR]
16 < \fIstdin\fR > \fIstdout\fR
22 \fBgpiv_vorstra\fP calculates the differential quantities like
23 vorticity, shear strain and normal strain from PIV data. You can
24 choose from several differential schemes: central differentiation,
25 least squares, Richardson extrapolation and circulation
26 method. Circulation method only allows to calculate vorticity, but no
27 strain. The output can be generated as ASCII data containing four
28 columns or as GNUPlot Data format that allows to view/print the data
31 The configuration parameters (containing the \fBPOST\fR key) may be
32 overruled by the command line options, as explained below.
38 Differential type to be used: central difference
39 (\fIN\fR=0), least squares (\fIN\fR=1), Richardson interpolation
40 (\fIN\fR=2), circulation method (\fIN\fR=3)
43 \fB-h\fR | \fB--help\fP
48 Calculate normal strain of the PIV data. As an alternative the program may
49 be called by its nickname \fIgpiv_nstrain\fR. In combination with
50 \fIfilename\fR the output will be written to \fIfilename\fB.nstr\fR.
54 Calculate vorticity of the PIV data. As an alternative the program may
55 be called by its nickname \fIgpiv_vorty\fR. In combination with
56 \fIfilename\fR the output will be written to \fIfilename\fB.vor\fR.
59 \fB-p\fR | \fB--print\fP
60 Print parameters, command line options and eventually used input and
61 output filenames to stdout. The output is identic of \fIfilename\fB.par\fR,
62 in case \fIfilename\fP is used.
66 Calculate shear strain of the PIV data. As an alternative the program may
67 be called by its nickname \fIsstrain\fR. In combination with
68 \fIfilename\fR the output will be written to \fIfilename\fB.sstr\fR.
72 Show contour plot of the output with gnuplot.
76 Suppresses to show contour plot of the output with gnuplot.
79 \fB-v\fR | \fB--version\fP
80 Print version information on standard output, then exit successfully.
84 Input PIV data file. Overrides stdin and stdout. The output will be
85 written to \fIfilename\fB.vor\fR with \fB-o\fP, \fIfilename\fB.nstr\fR
86 with \fB-n\fR or \fIfilename\fB.sstr\fR with \fB-s\fR. Parameters are stored
87 in \fIfilename\fB.par\fR and may be used for future use by including them