[Paraview] Averages over Selections of Sliced Areas

[Berk Geveci]

> In addition: the connectivity filter does something wrong, see the other attached picture: it cuts the region too early.

Hmmm. I can't reproduce this. Can you share a dataset that
demonstrates the problem?

> I have attached two pictures of this. In the histogram picture you also see the wall effect on the left side: the cooler temperatures. how could one extract these zones? as you guessed right, it can be measured by the wall distance: 100 mm from the wall should be excluded.

This is indeed a difficult problem. I can't think of one or more
filters that can compute the wall distance. What about computing a
derived quantity such as shear that would be large in the boundary
layer. Maybe you can use that to threshold?

-berk

On Thu, Jan 22, 2009 at 8:24 AM,  <merluza at gmx.net> wrote:
> Hi Berk
>
> Thanks for helping me with this subject. Now (1) works more or less. I applied the slice filter to get the cut, then the connectivity filter to mark the regionIDs, and then applied the extraction filter (ExtractCellsByRegion). I then applied the IntegrateVariables filter. Under temperature, I can read 12'200. How can I calculate the average? Divide this by number of cells? by number of data points? or by the area in square meters? guess the latter, right?
>
> I have seen that with the Histogram Filter, one get's the average, too.
>
> I have attached two pictures of this. In the histogram picture you also see the wall effect on the left side: the cooler temperatures. how could one extract these zones? as you guessed right, it can be measured by the wall distance: 100 mm from the wall should be excluded.
>
> In addition: the connectivity filter does something wrong, see the other attached picture: it cuts the region too early.
>
> thanks
> maurice
>
> below you find the original text
>
>
>
>
> This is a very cool challenge :-)
>
> (1) is pretty easy. After the slice filter, apply the Connectivity
> filter. This will create a new array called RegionId, which will be
> different for each region. You can the use the threshold filter or the
> selection mechanism to extract one of these regions.
>
> Now (2) is more fun. Is there any way of quantifying the regions that
> are outside the boundary zone? Is it based on distance? The value of
> some other variable?
>
> -berk
>
> On Fri, Jan 16, 2009 at 2:20 AM, Maurice Waldner <merluza at gmx.net> wrote:
>> Dear Paraview Users
>>
>> I have been using ParaView for some time now, but am unsure of how to calculate averages over certain areas. Picture1 shows a side-view of an incineration vessel. It has several passes, some of them with separation walls. Picture2 depicts a horizontal slice of it.
>> I would like to calculate average values (e.g. of velocity, temperature, etc.) of some of these SUB-areas of the slice. In addition, very near to the walls, there is the wall effect. I would for instance calculate the averages of the subareas, excluding the values nearer than 100 mm to the walls.
>>
>> 1) How can I calculate the averages of the sub-areas?
>> 2) How can I calculate the averages of the sub-areas, excluding the wall-effect boundary zone?
>>
>> Thank you very much for your help!
>> Maurice
>
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