[Paraview] question-filter

Cory Quammen cory.quammen at kitware.com
Mon Mar 14 11:04:01 EDT 2016 

One more thing: you should be able to change the Python expression to

sum(volume(inputs[0]))

On Mon, Mar 14, 2016 at 10:09 AM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> Hi Islem,
>
> Sorry for the late reply. I've been swamped lately.
>
> Thank you for the detailed explanation of what you are doing. That really
> helps us narrow down what might be going on.
>
> I'm not sure what the problem is. I have a simple pipeline example where
> this works:
>
> Sphere source -> Delaunay3D -> Python Annotation filter
>
> The Delaunay3D filter produces an unstructured grid, from which I am able
> to get the volumes.
>
> I suspect ParaView readds your OpenFOAM data set as a multiblock data set?
> Could you look at the Info panel and report it's Type. It should be the
> first item under the "Statistics" sub-section.
>
> If it is indeed a multiblock data set, please try this:
>
> Place a MergeBlocks filter between your Threshold filter and Python
> Annotation filter.
>
> Please see if that works. If it does, we'll move on to multiplying the
> volume by the water fraction.
>
> Thanks,
> Cory
>
> On Tue, Mar 8, 2016 at 6:35 AM, Megdich Islem <megdich_islem at yahoo.fr>
> wrote:
>
>> Hi cory,
>>
>> I was working on the case of water computation in the desired domain
>> taking into account your suggestions. I attached here some pictures that
>> helps to figure out how I did it. I created the domain in which I want to
>> compute the volume of water using the clip filter and then I thresolded the
>> clipped domain to  contain only the cells ranging between 0.5 and 1 of
>> alpha water and I ended up with the domain illustrated in picture 3, and
>> then I applied the annotation filter setting up the array association to
>> Point Data and the expression to algs.sum(algs.volume(inputs[0])), but I
>> ended up with an error in the render view and output message stating that
>> AttributeError:'None Type' object has no attribute 'GetCellData'. I
>> couldn't understand the reason, I tried  all the array Association options,
>> I got the same error, except for the Row Data, I got this error:
>> AttributeError:'NoneType' object has no attribute 'GetNumberOfArrays'.
>> (picture 4 and 5).
>>
>> I googled that link
>>
>> paraview.simple.PythonAnnotation — ParaView/Python 5.0.1-RC1-193-gad11756
>> documentation
>> <http://www.paraview.org/ParaView/Doc/Nightly/www/py-doc/paraview.simple.PythonAnnotation.html>
>>
>>
>>
>>
>>
>>
>>
>> paraview.simple.PythonAnnotation — ParaView/Python 5.0.1-RC1-193-gad11756
>> documentation
>> <http://www.paraview.org/ParaView/Doc/Nightly/www/py-doc/paraview.simple.PythonAnnotation.html>
>> Docs » Index paraview.simple.PythonAnnotation
>> paraview.simple.PythonAnnotation paraview.simple.PythonAnnotation(*input,
>> **params) This filter uses Python to calculate an expression. It
>> Afficher sur *www.paraview.org*
>> <http://www.paraview.org/ParaView/Doc/Nightly/www/py-doc/paraview.simple.PythonAnnotation.html>
>> Aperçu par Yahoo
>>
>>
>> It  says that I need to set the input which I didn't know how to do it
>> since it doesn't ask for any input in the Properties Panel. Any solutions
>> for this problem ??
>>
>> In this expression algs.sum(algs.volume(inputs[*0*])), what does the *0 * stands
>> for ?
>>
>> I think if I threshold the domain in which I want to calculate the volume
>> of water, let's say between 0.5 and 1, then I will end up by inaccurate
>> water volume because I am including volume of air in the computed volume
>> and on the other hand I am ignoring the cells that contain less than 0.5 of
>> water.
>>
>> That's why, I am looking for an algorithm that multiply every cell
>> containing water by the coefficient alpha water. You find attached in
>> picture 6, an example of how I want to calculate the water volume. I don't
>> know how to program it.
>>
>> Any helps concerning this matter will be very much appreciated.
>> Regards,
>> Islem Megdiche
>> PhD student
>>
>>
>> Le Mardi 23 février 2016 14h21, Cory Quammen <cory.quammen at kitware.com>
>> a écrit :
>>
>>
>> Hi Islem,
>>
>> Please reply-all to keep the discussion on the list so that others may
>> benefit from the discussion.
>>
>> First, is there a data array that describes whether a volume element
>> in your mesh contains water or some other element? If so, you can use
>> the Threshold filter under the Filters -> Alphabetical -> Threshold
>> menu to select only the elements representing water. You will have to
>> set the minimum and maximum to the value that represents water, then
>> click Apply.
>>
>> HTH,
>> Cory
>>
>> On Mon, Feb 22, 2016 at 1:14 PM, Megdich Islem <megdich_islem at yahoo.fr>
>> wrote:
>> > Hi again,
>> >
>> > Thank you for your suggestion, Could you please explain how to do the
>> first
>> > step because I am not the one who created the picture I sent you before.
>> >
>> > Regards,
>> > Islem
>> >
>> >
>> > Le Lundi 22 février 2016 16h45, Megdich Islem <megdich_islem at yahoo.fr>
>> a
>> > écrit :
>> >
>> >
>> > Thank you for your reply. I will try your suggestions.
>> >
>> > Regards,
>> > Islem
>> >
>> >
>> > Le Lundi 22 février 2016 14h22, Cory Quammen <cory.quammen at kitware.com>
>> a
>> > écrit :
>> >
>> >
>> > Islem,
>> >
>> > There are likely two steps:
>> >
>> > 1). Threshold your volume to identify only the water-containing cells.
>> > It looks like you have a way to do this already?
>> >
>> > 2). Compute the volumes of the water-containing cells and summing them
>> up.
>> >
>> > You can use the Threshold filter to do number 1 if you have a material
>> > code in the cell data. To compute the volume of the cells, add a
>> > Python Annotation filter to the Threshold filter. Set the Expression
>> > to
>> >
>> > algs.sum(algs.volume(inputs[0]))
>> >
>> > This uses the numpy-like interface in the Python layer to compute the
>> > volumes of the cells and sum them all up. The Python Annotation filter
>> > should display the volume with a text label in your renderer.
>> >
>> > Hope this helps,
>> > Cory
>> >
>> > On Mon, Feb 22, 2016 at 9:09 AM, Megdich Islem <megdich_islem at yahoo.fr>
>> > wrote:
>> >> Hi Cory,
>> >>
>> >> Thank you very much for your prompt reply. I've attached here a picture
>> >> that
>> >> illustrates my problem. I am working on the break of bund walls and I
>> want
>> >> to compute the volume of water that overtops the bund wall (walls
>> >> surrounding storage tank), after the  solution reaches the steady
>> state.
>> >>
>> >> Regards,
>> >> Islem
>> >>
>> >>
>> >> Le Lundi 22 février 2016 13h53, Cory Quammen <cory.quammen at kitware.com>
>> a
>> >> écrit :
>> >>
>> >>
>> >> Hi Islem,
>> >>
>> >> This is the place to ask ParaView questions! There is some activity on
>> >> StackOverflow, but most people ask questions on this mailing list.
>> >>
>> >> Could you clarify what you want to compute? Do you just want to subset
>> >> a volume mesh and display the results over time? Do you want to
>> >> compute one quantity and display it as a graph over time? Do you want
>> >> to compute a single number from a time series data set?
>> >>
>> >> Thanks,
>> >> Cory
>> >>
>> >> On Mon, Feb 22, 2016 at 8:48 AM, Megdich Islem <megdich_islem at yahoo.fr
>> >
>> >> wrote:
>> >>> Hello,
>> >>>
>> >>> I am new to paraview, and I didn't find a forum under paraview
>> website to
>> >>> ask my question.
>> >>> My question is is there any filter in paraview that lets to compute
>> the
>> >>> evolution of a quantity within a specific volume of the mesh.
>> >>>
>> >>> Regards,
>> >>> Islem
>> >>>
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>> >>>
>> >>
>> >>
>> >>
>> >> --
>> >> Cory Quammen
>> >> R&D Engineer
>> >> Kitware, Inc.
>>
>> >
>> >>
>> >>
>> >>
>> >
>> >
>> >
>> > --
>> > Cory Quammen
>> > R&D Engineer
>> > Kitware, Inc.
>> >
>> >
>> >
>> >
>>
>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
>>
>>
>>
>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>



-- 
Cory Quammen
R&D Engineer
Kitware, Inc.
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