Pseudoschlieren image computation

October 15, 2003, 10:44

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

October 15, 2003, 11:52

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

October 16, 2003, 04:40

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

Best regards, Ingo Meisel

October 15, 2003, 10:44	Pseudoschlieren image computation	#1
S. Maehlmann Guest Posts: n/a	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

October 15, 2003, 11:52	Re: Pseudoschlieren image computation	#2
Lionel Larcheveque Guest Posts: n/a	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

October 16, 2003, 04:40	Re: Pseudoschlieren image computation	#3
Ingo Meisel Guest Posts: n/a	PDF is at http://www.nas.nasa.gov/Research/Rep...nas-99-002.pdf Best regards, Ingo Meisel

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