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schlieren output

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Old   July 15, 2011, 13:56
Default schlieren output
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Mohan
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Hi

How is it possible to get a Schlieren type image output using Tecplot? (I've checked the archives...though a few have asked this question, they have gone unanswered)

Thank you
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Old   July 15, 2011, 18:19
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Scott Rumage
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Tecplot 360 can make a “simulated” Schlieren via flooded contours of the density magnitude. Image #7 on this link gives an example: http://www.tecplot.com/Community/PlotGallery/2DPlots.aspx
BTW - a Shawdowgraph is calculated via the 360 menu bar: Analyze>>Calculate Variables>>Shawdowgraph (but I did not find the Schlieren calculation referenced in the above link).
I hope this is of some help.
Scott
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Old   July 16, 2011, 19:11
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Mohan
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Thanks Scott, that was actually helpful. That'll be something I'll be needing too!

I'm trying to experiment with the density related variables to give me a Schlieren type image at the moment.
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Old   July 16, 2011, 19:53
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Quote:
Originally Posted by scott_rumage View Post
Tecplot 360 can make a “simulated” Schlieren via flooded contours of the density magnitude.
That doesn't give me the Schlieren . I see only a single colour on my plot when I do that.
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Old   January 8, 2013, 04:50
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Hi,

A Sch. image is due to the density gradient if memory serves me right. Therefore you need to use the same thing in the code.

This is what I do:
1) Go to data -> alter equations
2) make two variables {rx}=ddx(V01) and {ry}=ddy(V01) where V01 is the density.
3) make a variable {sch} = ({rx}**2+{ry}**2)**0.5
4) Plot contours of {sch}

Often I find I need to change the cutoffs and ranges to bring out the detail, choose grayscale and for some reason inverting it always seems nicer but that might just be my case.

Hope this helps.
Mike
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