GfsOutputPPM

From Gerris

OutputPPM writes a colour image of the given scalar field in PPM (Portable PixMap) format.

The syntax in parameter files is as follows:

[ GfsOutputScalar ]

By default the pixels are the square cells at the highest level of refinement. The level of the cells displayed can be controlled using the maxlevel option of GfsOutputScalar. Setting maxlevel can also be useful to control the size (in pixels) of the image produced: when maxlevel is set the pixel size of the image will always be a multiple (depending on the number of boxes in the computation domain) of 2^maxlevel. This holds even when the number of levels in the simulation changes due to adaptive refinement (see also this question in the FAQ).

Note that this object is only available for 2D simulations.

Examples

• B\'enard--von K\'arm\'an Vortex Street for flow around a cylinder at Re=160

  OutputPPM { istep = 2 } { ppm2mpeg > vort.mpg } {
    min = -10 max = 10 v = Vorticity 
  }

  OutputPPM { istep = 2 } { ppm2mpeg > t.mpg } {
    min = 0 max = 1 v = T
  }

  OutputPPM { start = 15 } { convert -colors 256 ppm:- vort.eps } {
    min = -10 max = 10 v = Vorticity
  }

  OutputPPM { start = 15 } { convert -colors 256 ppm:- t.eps } {
    min = 0 max = 1 v = T
  }

• Vortex street around a "heated" cylinder

  OutputPPM { istep = 2 } { ppm2mpeg > t.mpg } {
    min = 0 max = 0.4 v = T
  }

  OutputPPM { start = 15 } { convert -colors 256 ppm:- t.eps } {
    min = 0 max = 0.4 v = T
  }

• Rayleigh-Taylor instability

  OutputPPM { istep = 2 } { ppm2mpeg > vort.mpg} {
    min = -30 max = 30 v = Vorticity
  }

  OutputPPM { istep = 2 } { ppm2mpeg > t.mpg } {
    min = 0 max = 1 v = T
  }

  OutputPPM { start = end } { convert -colors 256 ppm:- vort.eps } {
    min = -30 max = 30 v = Vorticity
  }

  OutputPPM { start = end } { convert -colors 256 ppm:- t.eps } {
    min = 0 max = 1 v = T
  }

• Coalescence of a pair of Gaussian vortices (Gerris logo)

    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
        box = -0.025,-0.025,0.025,0.025
    }

• "Garden sprinkler effect" in wave model

    OutputPPM { step = 12 } { ppm2mpeg > hs-MINLEVEL-NTHETA.mpg } { v = Hs maxlevel = 7 }

• Time-reversed VOF advection in a shear flow

    OutputPPM { start = 0 } { convert ppm:- t-0.eps } { v = T }

    OutputPPM { start = 2.5 } { convert ppm:- t-2.5.eps } { v = T }

    OutputPPM { start = 5 } { convert ppm:- t-5.eps } { v = T }

    OutputPPM { start = end } { convert ppm:- dt-5.eps } { v = DT }

• Time-reversed advection with curvature-based refinement

    OutputPPM { start = end } { convert ppm:- dt-5.eps } { v = DT }

• Lid-driven cavity at Re=1000

  OutputPPM { start = end } { convert -colors 256 ppm:- velocity.eps } {
    v = Velocity
  }

• Lid-driven cavity at Re=1000 (explicit scheme)

  OutputPPM { start = end } { convert -colors 256 ppm:- velocity.eps } {
    v = Velocity
  }

• Gravity waves in a realistic ocean basin

    OutputPPM { start = 2 } { convert ppm:- p.eps } { v = P min = -5e-3 max = 5e-3 }