## 2681RE: [Tecplot_Talk] Re: extract a sub-zone from a 2D plane

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• May 14, 2008

Dear Stephen,

Yes, I've got your point. However, I am really interested in obtain a property area weighted average in a delimited region of the large zone with no influence of the values evaluated on the smaller zone. I mean, if I create a new smaler zone (that corresponds to the size of the delimited region cited ealier), interpolate the property of the large and small zones, and afterwards perform the area weithed average integration of this property on the smaller zone, tecplot will return me a different value of the one I should expect, and it happens because of  the interpolation.

In order to be sure of this, I created a zone with the same size of the larger zone (and in the same position), then I interpolated the desired property between the two zones and afterwards I performed the property area weighted average integration on both zones. The resuls were not the same.

So, I think that interpolation is not the way of doing it. Please correct me if Im wrong.

Do I have other way of obtain the results ?

Thank you a lot and sorry for the big (and perhaps messy) text.

Best regards,

Thiago Dutra - Mechanical Engineer
POLO - Research Laboratories for Emerging
Technologies in Cooling and Thermophysics
Department of Mechanical Engineering
Federal University of Santa Catarina
88040-900 - Florianópolis - SC
BRAZIL
Phone: (55) 48 3331-9397 / Fax: (55) 48 3234-5166
e.mail: dutra@...

--- Em qua, 14/5/08, Alter, Stephen J. (LARC-D305) <Stephen.J.Alter@...> escreveu:
De: Alter, Stephen J. (LARC-D305) <Stephen.J.Alter@...>
Assunto: RE: [Tecplot_Talk] Re: extract a sub-zone from a 2D plane
Para: Tecplot_Talk@yahoogroups.com
Data: Quarta-feira, 14 de Maio de 2008, 16:44

Thiago,

Absolutely. I do this all the time. As a matter of fact, the Mesh Generator (MG) that comes with Tecplot is an excellent tool to use for this very application. In the MG, you can select points to use as root points for lines that construct a grid in the smaller, new region to be evaluated. This works primarily in 2D but can be made to work in 3D in a quasi sense. If the surface is really 3D, cast the grid of the surface into a set of two physical coordinates that spreads the area the most, such as Y-Z. In that 2D plane, generate your new smaller grid, and interpolate the missing coordinate as well as the data to get a better representation of the area weighting.

From: Tecplot_Talk@ yahoogroups. com [mailto:Tecplot_ Talk@yahoogroups .com] On Behalf Of Thiago Boeing
Sent: Wednesday, May 14, 2008 3:25 PM
To: Tecplot_Talk@ yahoogroups. com
Subject: RE: [Tecplot_Talk] Re: extract a sub-zone from a 2D plane