Flow field vectors on wake/behind wing/Treftz plane

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José Roberto Clark Reis

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Oct 24, 2025, 1:24:27 PMOct 24
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Hi all!
On VSP aeros postprocessor, I have been able to show the vectors of the flow field in a certain cut plane, similiar to a Treftz plane. My idea now is to apply Lagrangian particle tracking and try to optimize the spray bar. For that, I need to "queue" vsp aero to obtain the values related to these vectors in a certain cut plane. Any ideas? Is there any file or inner structures of the code where this data is stored?

Cheers, José

Rob McDonald

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Oct 26, 2025, 12:34:58 AMOct 26
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Jose,

You can specify a set of velocity survey points in the *.vspaero setup file.  The GUI won't do it for you, but you can set up a case in the GUI, edit the file manually, then run it at the command line.

You need to add list of survey points to the bottom of the file.


NumberofSurveyPoints = N
1 x1 y1 z1
2 x2 y2 z2
...
N xN yN zN

VSPAERO will create a *.svy file with the x,y,z,u,v,w data for each point in your survey.

Rob

Matin Nafari

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Dec 16, 2025, 10:39:56 AM (13 days ago) Dec 16
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Hello, 

Can you tell me please what do you mean exactly by "then run it at the command line."
which command line are you referring to and how should I do that?

Thanks!

Rob McDonald

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Dec 16, 2025, 1:52:08 PM (13 days ago) Dec 16
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When you run VSPAERO from the GUI, if you scroll to the very top of the output console, it will echo the exact command line that it is executing.

You then go to the command line in your operating system -- however you do that -- and type in the corresponding command.

If you don't know how to run things from the command line, then this approach is not for you.

Rob
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