What method of integration does Tecplot 360′s Analyze menu use?

souria · September 30, 2014, 09:52

Hey every one,

I'm calculating average quantities over a domaine using "integration method" via Analyze menu.
I would like to know how to get the equation that Tecplot uses to do this calculation (integrationn)?!

Thanks for your help

Souria,

scott_rumage · October 2, 2014, 11:47

This paragraph on page 304 of the Tecplot 360 User manual located at this link: http://download.tecplot.com/360/current/360_users_manual.pdfstates:

Integrations of a variable or variable function use the trapezoidal method, and are second-order accurate. For each segment, face, or volume cell, the appropriate nodal or cell-centered values are averaged and multiplied by the cell length, area or volume. The calculation sums the resulting qualities over the zone or specified subset to product the integrated result. Standard deviation is calculated using the sample standard deviation method (the values are taken to be a sample of a population, and the sum of the squares of the value is divided by N-1 rather than by N).

A review the chapter CFD Data Analysis in the same manual should be helpful if you require more information.

Regards,
Scott

Durrell4 · October 2, 2014, 12:43

Hi Souria,

I am interested in the results of your integration. Were the results you were getting from Tecplot consistent with your expectations? Can you tell me a little bit more about what you were trying to do. I ask because we strive to make Tecplot as accurate as possible and I want to make sure you are getting the right results.

Durrell
VP of Product Management
Tecplot inc.

souria · October 7, 2014, 16:28

Hey Durell4,
My aim objective is to see the evolution of flow quantities (velocity, vorticity...) over time. So, with this integration shows sharp periodicities of the flow dynamics thus yes, the results are in confirm with i am expecting to find.

I don't know if i respond to your interrogations, I can give more details if you want.

But, I didn't find answer to my question, I'm searching the formulation/equation that Tecplot uses for the integration

??!!

@ Scott-rumage : Your link doesn't work !!!

Thanks

scott_rumage · October 7, 2014, 16:34

Here is a link to the manual: http://download.tecplot.com/360/curr...ers_manual.pdf

and, as a reference, here is link to Tecplot's documentation page:
http://www.tecplot.com/support/documentation/

Thanks,
Scott

September 30, 2014, 09:52	What method of integration does Tecplot 360′s Analyze menu use?	#1
souria Member souria Join Date: Mar 2013 Location: Nancy Posts: 66 Rep Power: 13	Hey every one, I'm calculating average quantities over a domaine using "integration method" via Analyze menu. I would like to know how to get the equation that Tecplot uses to do this calculation (integrationn)?! Thanks for your help Souria, Last edited by souria; September 30, 2014 at 10:59.

October 2, 2014, 12:43	Results of your integration	#3
Durrell4 Member Durrell Rittenberg Join Date: May 2011 Location: Bellevue WA Posts: 38 Rep Power: 15	Hi Souria, I am interested in the results of your integration. Were the results you were getting from Tecplot consistent with your expectations? Can you tell me a little bit more about what you were trying to do. I ask because we strive to make Tecplot as accurate as possible and I want to make sure you are getting the right results. Durrell VP of Product Management Tecplot inc.

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October 2, 2014, 11:47		#2
scott_rumage Senior Member Scott Rumage Join Date: May 2009 Location: Seattle, WA Posts: 152 Rep Power: 17	This paragraph on page 304 of the Tecplot 360 User manual located at this link: http://download.tecplot.com/360/current/360_users_manual.pdfstates: Integrations of a variable or variable function use the trapezoidal method, and are second-order accurate. For each segment, face, or volume cell, the appropriate nodal or cell-centered values are averaged and multiplied by the cell length, area or volume. The calculation sums the resulting qualities over the zone or specified subset to product the integrated result. Standard deviation is calculated using the sample standard deviation method (the values are taken to be a sample of a population, and the sum of the squares of the value is divided by N-1 rather than by N). A review the chapter CFD Data Analysis in the same manual should be helpful if you require more information. Regards, Scott

October 7, 2014, 16:28		#4
souria Member souria Join Date: Mar 2013 Location: Nancy Posts: 66 Rep Power: 13	Hey Durell4, My aim objective is to see the evolution of flow quantities (velocity, vorticity...) over time. So, with this integration shows sharp periodicities of the flow dynamics thus yes, the results are in confirm with i am expecting to find. I don't know if i respond to your interrogations, I can give more details if you want. But, I didn't find answer to my question, I'm searching the formulation/equation that Tecplot uses for the integration ??!! @ Scott-rumage : Your link doesn't work !!! Thanks

October 7, 2014, 16:34		#5
scott_rumage Senior Member Scott Rumage Join Date: May 2009 Location: Seattle, WA Posts: 152 Rep Power: 17	Here is a link to the manual: http://download.tecplot.com/360/curr...ers_manual.pdf and, as a reference, here is link to Tecplot's documentation page: http://www.tecplot.com/support/documentation/ Thanks, Scott