[Paraview] ParaView Digest, Vol 64, Issue 8, Message 2

[Tobias Froebel]

Hello Wei,

I'm using the Integrate Filter to calculate area- and mass-averaged flow
values in planar polydata grids (boundary surfaces) of cfd-models.

It's important to convert point-data to cell-data previous to applying
the integrate variables filter. After applying this filter you receive
area averaged values of every cell-data. Therefore in my case you would
have to multiply the averaged value (for example averaged temperature)
with the although calculated area value to receive "proper" temperature
values.

I've never tried to apply the integrate filter on 3D volume data, but I
expect volume averaged results, therefore multiplying with the volume
value should give you more meaningful values.

Tobias

-- 
Dipl.-Ing. Tobias Fröbel / CFD

Institute for Flight Propulsion / TU Munich

> Message: 2
> Date: Wed, 5 Aug 2009 12:01:19 +0100
> From: "Wei Wu" <wei.wu-2 at postgrad.manchester.ac.uk>
> Subject: [Paraview] Average value on specific sub-domains
> To: <paraview at paraview.org>
> Message-ID:
> 	<002401ca15bc$0fee9790$2fcbc6b0$@wu-2 at postgrad.manchester.ac.uk>
> Content-Type: text/plain; charset="utf-8"
>
> Dear all,
>
> I am from Manchester, UK and I am new to CFD calculations. I am using Code_Saturne(http://code-saturne.blogspot.com) /FVM method to produce data in EnSight format and then checking it in ParaView. An illustration is attached. I am working on coolant oil flow and so the picture shows a matrix of oil flow ducts. This is a 2D model with structured rectangular mesh grid, but the mesh density is not uniform.
>
> In order to compare with results from my lumped parameter models, I have to investigate average values of parameters (the most important one of these is temperature) on specific sub-domains, as framed out in the picture. I found a solution (http://www.paraview.org/pipermail/paraview/2008-April/007882.html) and tried the filter "integrate variables", but found the result doesn't seem to be reasonable. I guess I must did something wrong.
>
> I am quite interested in the extension script by python. Because my model is constructed by basic geometric elements, and the number of the elements is growing along with my progress, I am thinking about using python to obtain average values for all of the sub-domains in a loop. If I can access information of all the cells in a specific sub-domain (I can compute coordinate of these domains first), including rectangular cells' sides and areas as well as the corresponding cell values (temperature, pressure, velocity etc), I guess it is not difficult to derive average values for all of the sub-domains.
>
> I know a little about python and have experience on programming. I looked up ParaView Wiki, tried some python samples, but unfortunately I still don't know how to start to implement my idea. Is there a detailed API functions manual existing? Or could you please give some hints or examples to help?
>
> Thank you very much for your help about this.
>
> Best regards,
> Wei
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