## File: logo.gfs

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gerris 20131206+dfsg-17
 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061 # Title: Coalescence of a pair of Gaussian vortices (Gerris logo) # # Description: # # This example generates the Gerris desktop logo (Figure \ref{logo}). # # A pair of Gaussian vortices slowly merge. This is the primary # mechanism controlling the evolution of two-dimensional turbulence # and consequently has been studied in some detail. # # \begin{figure}[htbp] # \caption{\label{logo}Gerris logo and animation.} # \begin{center} # \htmladdnormallinkfoot{\includegraphics[width=0.15\hsize]{logo.eps}}{logo.mpg} # \end{center} # \end{figure} # # Author: St\'ephane Popinet # Command: gerris2D logo.gfs | gfsview2D logo.gfv # Required files: logo.gfv # Version: 100317 # Running time: 5 minutes # Generated files: logo.mpg logo.png logo.eps # 1 0 GfsSimulation GfsBox GfsGEdge {} { Time { end = 4 } Refine 6 # Initialise a vorticity field given by two gaussian distributions InitVorticity {} { /* We use nested functions for simplicity (this will not work on MACOSX) */ double vortex (double xc, double yc, double r) { double r2 = (x - xc)*(x - xc) + (y - yc)*(y - yc); return 2.*M_PI*exp (- 2.*r2/(r*r)); } double r = 0.01, theta = 30.*M_PI/180.; return vortex (-r*sin(theta), r*cos(theta), 0.01) + vortex (r*sin(theta), -r*cos(theta), 0.01); } AdaptVorticity { istep = 1 } { cmax = 1e-2 maxlevel = 12 minlevel = 6 } OutputTime { istep = 1 } stderr OutputProjectionStats { istep = 1 } stderr OutputSimulation { istep = 10 } stdout OutputPPM { istep = 2 } { ppm2mpeg > logo.mpg } { v = Vorticity min = -0.1348 max = 6.22219 # Only generate the movie in a small box centered on the # origin. We also need to make sure that box size is a multiple # of 1./64. so that the PPM image size stays constant (avconv # crashes on variable image sizes). condition = (Level < 6 || (x >= -3./128. && x <= 3./128. && y >= -3./128. && y <= 3./128.)) } EventScript { start = end } { echo "Save logo.ppm { width = 1024 height = 1024 }" sleep 5 # to wait for GfsView to finish writing the image convert -transparent "#0000FF" logo.ppm -geometry 156x156 logo.png montage -background white -geometry +0+0 logo.png logo.eps rm -f logo.ppm } } GfsBox {}