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Old   October 15, 2003, 10:44
Default Pseudoschlieren image computation
S. Maehlmann
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Hi all,

i'm looking for recipes to generate pseudoschlieren images from numerical flow data. Is it such the absolute density gradient, what i have to compute? Thanks in advance. Stefan
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Old   October 15, 2003, 11:52
Default Re: Pseudoschlieren image computation
Lionel Larcheveque
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Basically, compute the norm of 2D density gradient for 1 computational plane x-y :


and for instance draw contours with an exponential level distribution for S.

See R. Samtaney, "Visualization, extraction and quantification of discontinuities in compressible flows", technical report NAS-99-002", NASA, March 1999, for some details (freely downloadable, but I don't remember the electronic address. Use NASA STI search engine :

Best regards

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Old   October 16, 2003, 04:40
Default Re: Pseudoschlieren image computation
Ingo Meisel
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PDF is at

Best regards, Ingo Meisel
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