Dear Tobias,
Many thanks for your help.
Do you think it is necessary to extract the sub-domain, on which I
want to calculate average value, previous to using the integrate filter?
I am so sorry that I am still confused about the integrate filter. For
example, I have a result, in which temperatures are in the range 20 ~
39.5 degree C. After I apply the integrate filter, I got the
temperature value is 0.00210551, which is so small. I multiply this
value with the cell number, 23040, I got 48.5109504, which is beyond
the range.
You did mention I have to multiply this averaged value with the
calculated area value to produce proper values. I feel sorry that I
don't truly understand this. In my example, the area/volume is very
small. They are at the level 0.01/0.001. Therefore 0.00210551 times
total area/volume cannot give a reasonable temperature either. I feel
quite confused.
Many thanks in advance for your further help.
Regards, Wei
Quoting Tobias Froebel <[email protected]>:
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" <[email protected]>
Subject: [Paraview] Average value on specific sub-domains
To: <[email protected]>
Message-ID:
<002401ca15bc$0fee9790$2fcbc6...@[email protected]>
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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