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Old   December 10, 2008, 10:03
Default Tecplot: Velocity Magnitude/nonspecified variables
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I'm wondering if anyone can help. I've been having problems trying to display velocity magnitude within tecplot. As I understand it, when you import a fluent file, Velocity magnitude isn't specified. From what I've read you create a new variable from data, open Data/Alter/Specify Equations. I then define the equation of the new variable in function of the others.

For instance, I define the Velocity Magnitude (V26), in function of X- Y- and Z-Velocity (V1, V2, V3) as:


The problem I'm having is, I don't know how to create a new variable for velocity magnitude! Also, I do not know where to get the actual variable name of the X,Y,Z velocitys. I tried getting this info from "data set info" menu. I tried the variable names in there. It didn't work. It came up with some kind of error I'm using tecplot 360. So, what I'd like to know is,

1) How do I create a new variable. Do they automatically get generated when I specify any name or do I have to define a name before I specify an equation?

2) How do I find the name of current variables, so I can use in equations.

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Old   December 19, 2008, 04:33
Default Re: Tecplot: Velocity Magnitude/nonspecified varia
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Go to "Analyse-Calculate Variables" and select the Velocity Magnitude variable from the list then press "calculate" and OK.

Afterwards re-open the contours dialog and velocity magnitude should be at the end of the list.

At least this is the proceedure for Tecplot 360.
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Old   January 8, 2009, 08:12
Default Re: Tecplot: Velocity Magnitude/nonspecified varia
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Thank you! This was driving me mad.
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Old   January 8, 2009, 08:51
Default Re: Tecplot: Velocity Magnitude/nonspecified varia
Anastasios Georgoulas
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Best luck
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Old   November 15, 2010, 13:26
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It helped me too, thanks!
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Old   November 16, 2010, 04:53
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Richard Jones Soong
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It's very EZ, u can find current variables in Data Set Information Dialog within Data menu, in form V1,V2...Vn. If U don't want 2 name a new variable( for example: velocity magnitude), U should write in form of {Variable name}.
I havn't got right result by methord of Analyse-Calculate Variables, I don't know why.
For instance {Vm}=sqrt(v5*v5+v7*v7+v9*v9) Yours sincerely
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Old   November 22, 2011, 11:12
Default Regarding Tecplot issue on Velocity magnitude
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thanks a lot it worked out for me to...
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