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-   -   Pseudoschlieren image computation (http://www.cfd-online.com/Forums/main/6702-pseudoschlieren-image-computation.html)

S. Maehlmann October 15, 2003 10:44

Pseudoschlieren image computation
 
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

Lionel Larcheveque October 15, 2003 11:52

Re: Pseudoschlieren image computation
 
Hi

Basically, compute the norm of 2D density gradient for 1 computational plane x-y :

S=sqrt((drho/dx)^2+(drho/dy)^2)

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 : www.sti.nasa.gov)

Best regards


Ingo Meisel October 16, 2003 04:40

Re: Pseudoschlieren image computation
 
PDF is at http://www.nas.nasa.gov/Research/Rep...nas-99-002.pdf

Best regards, Ingo Meisel


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