[Paraview] PV 3.10.1 integration over a surface

[Stephen Wornom]

How does one compute the integral of P Normal ds ? 
where Normal is the surface normal vector 

click on integrate variables computes the integral of P ds 
I would like 
Fx = integral of P nx ds 
where nx ds is the surface area normal to the x-direction. 
Hope my question is clear. 
Stephen 
p.s. 
The surface in question is a cylinder 
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Re: [Paraview] PV 3.10.1 integration over a surface

[Andy Bauer]

One way is to use the calculator filter to multiply the pressure by the
normal to get force per unit area on the cylinder.  Then you can use the
integrate variables filter to get the total force on it.

If you don't have normals on your cylinder, you can use the generate surface
normals filter but that only works for polydata.  The extract surface should
get you from any other data set to the polydata you want.

Andy

On Sun, Jun 19, 2011 at 4:01 AM, Stephen Wornom wrote:

> How does one compute the integral of P Normal ds ?
> where Normal is the surface normal vector
>
> click on integrate variables computes the integral of P ds
> I would like
> Fx = integral of P nx ds
> where nx ds is the surface area normal to the x-direction.
> Hope my question is clear.
> Stephen
> p.s.
> The surface in question is a cylinder
>
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Re: [Paraview] PV 3.10.1 integration over a surface

[Stephen Wornom]

Andy Bauer wrote:
One way is to use the calculator filter to multiply the pressure by 
the normal to get force per unit area on the cylinder.  Then you can 
use the integrate variables filter to get the total force on it. 

If you don't have normals on your cylinder, you can use the generate 
surface normals filter but that only works for polydata.  The extract 
surface should get you from any other data set to the polydata you want.

I have cell normals (vector) next I do
cell data to point data
extract surface
when I do calculator, the cell normal vector is not in the list. How do 
I get the cell normal vector in the calculator list?

Thanks for your help,
Stephen


Andy

On Sun, Jun 19, 2011 at 4:01 AM, Stephen Wornom 
mailto:stephen.wor...@inria.fr>> wrote:


How does one compute the integral of P Normal ds ?
where Normal is the surface normal vector

click on integrate variables computes the integral of P ds
I would like
Fx = integral of P nx ds
where nx ds is the surface area normal to the x-direction.
Hope my question is clear.
Stephen
p.s.
The surface in question is a cylinder

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--
stephen.wor...@inria.fr
2004 route des lucioles - BP93
Sophia Antipolis
06902 CEDEX

Tel: 04 92 38 50 54
Fax: 04 97 15 53 51

<>___
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Re: [Paraview] PV 3.10.1 integration over a surface

[Andy Bauer]

I think the cell normals that you have are generated for visualization and
not really part of your data set that's directly outputted from your
filter.  So when you do cell data to point data you still don't have the
normals in there.

Did you try using the extract surface and generate surface normals filters?

On Sun, Jun 19, 2011 at 12:52 PM, Stephen Wornom wrote:

> Andy Bauer wrote:
>
>> One way is to use the calculator filter to multiply the pressure by the
>> normal to get force per unit area on the cylinder.  Then you can use the
>> integrate variables filter to get the total force on it.
>> If you don't have normals on your cylinder, you can use the generate
>> surface normals filter but that only works for polydata.  The extract
>> surface should get you from any other data set to the polydata you want.
>>
> I have cell normals (vector) next I do
> cell data to point data
> extract surface
> when I do calculator, the cell normal vector is not in the list. How do I
> get the cell normal vector in the calculator list?
> Thanks for your help,
> Stephen
>
>>
>> Andy
>>
>> On Sun, Jun 19, 2011 at 4:01 AM, Stephen Wornom 
>> > stephen.wornom@inria.**fr >> wrote:
>>
>>How does one compute the integral of P Normal ds ?
>>where Normal is the surface normal vector
>>
>>click on integrate variables computes the integral of P ds
>>I would like
>>Fx = integral of P nx ds
>>where nx ds is the surface area normal to the x-direction.
>>Hope my question is clear.
>>Stephen
>>p.s.
>>The surface in question is a cylinder
>>
>>__**_
>>Powered by www.kitware.com 
>>
>>Visit other Kitware open-source projects at
>>
>> http://www.kitware.com/**opensource/opensource.html
>>
>>Please keep messages on-topic and check the ParaView Wiki at:
>>http://paraview.org/Wiki/**ParaView
>>
>>Follow this link to subscribe/unsubscribe:
>>
>> http://www.paraview.org/**mailman/listinfo/paraview
>>
>>
>>
>
> --
> stephen.wor...@inria.fr
> 2004 route des lucioles - BP93
> Sophia Antipolis
> 06902 CEDEX
>
> Tel: 04 92 38 50 54
> Fax: 04 97 15 53 51
>
>
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Re: [Paraview] PV 3.10.1 integration over a surface

[Jérôme]

Hi,
my understanding is that when you used CellDataToPointData filter, the cell
data are removed and thus they don't appear in the Calculator. The
CellDataToPointData filter has a "Pass Cell Data" option that will keep the
original data in the pipeline.
However, I didn't understand from where you got your normals: are they
generated from "Generate Surface Normals" filter or outside ParaView? When
you load your data, do you see the CellData array in the information tab of
your data?

Best regards,
Jerome

2011/6/19 Andy Bauer 

> I think the cell normals that you have are generated for visualization and
> not really part of your data set that's directly outputted from your
> filter.  So when you do cell data to point data you still don't have the
> normals in there.
>
> Did you try using the extract surface and generate surface normals filters?
>
>
> On Sun, Jun 19, 2011 at 12:52 PM, Stephen Wornom 
> wrote:
>
>> Andy Bauer wrote:
>>
>>> One way is to use the calculator filter to multiply the pressure by the
>>> normal to get force per unit area on the cylinder.  Then you can use the
>>> integrate variables filter to get the total force on it.
>>> If you don't have normals on your cylinder, you can use the generate
>>> surface normals filter but that only works for polydata.  The extract
>>> surface should get you from any other data set to the polydata you want.
>>>
>> I have cell normals (vector) next I do
>> cell data to point data
>> extract surface
>> when I do calculator, the cell normal vector is not in the list. How do I
>> get the cell normal vector in the calculator list?
>> Thanks for your help,
>> Stephen
>>
>>>
>>> Andy
>>>
>>> On Sun, Jun 19, 2011 at 4:01 AM, Stephen Wornom 
>>> >> stephen.wornom@inria.**fr >> wrote:
>>>
>>>How does one compute the integral of P Normal ds ?
>>>where Normal is the surface normal vector
>>>
>>>click on integrate variables computes the integral of P ds
>>>I would like
>>>Fx = integral of P nx ds
>>>where nx ds is the surface area normal to the x-direction.
>>>Hope my question is clear.
>>>Stephen
>>>p.s.
>>>The surface in question is a cylinder
>>>
>>>__**_
>>>Powered by www.kitware.com 
>>>
>>>Visit other Kitware open-source projects at
>>>
>>> http://www.kitware.com/**opensource/opensource.html
>>>
>>>Please keep messages on-topic and check the ParaView Wiki at:
>>>http://paraview.org/Wiki/**ParaView
>>>
>>>Follow this link to subscribe/unsubscribe:
>>>
>>> http://www.paraview.org/**mailman/listinfo/paraview
>>>
>>>
>>>
>>
>> --
>> stephen.wor...@inria.fr
>> 2004 route des lucioles - BP93
>> Sophia Antipolis
>> 06902 CEDEX
>>
>> Tel: 04 92 38 50 54
>> Fax: 04 97 15 53 51
>>
>>
>
> ___
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> Visit other Kitware open-source projects at
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> Please keep messages on-topic and check the ParaView Wiki at:
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Re: [Paraview] PV 3.10.1 integration over a surface

[Stephen Wornom]

Andy Bauer wrote:
I think the cell normals that you have are generated for visualization 
and not really part of your data set that's directly outputted from 
your filter.  So when you do cell data to point data you still don't 
have the normals in there.


Did you try using the extract surface and generate surface normals 
filters?
It works now (when I click extract surface, the generate surface normals 
filter becomes active).

Thanks,
Stephen


On Sun, Jun 19, 2011 at 12:52 PM, Stephen Wornom 
mailto:stephen.wor...@inria.fr>> wrote:


Andy Bauer wrote:

One way is to use the calculator filter to multiply the
pressure by the normal to get force per unit area on the
cylinder.  Then you can use the integrate variables filter to
get the total force on it.
If you don't have normals on your cylinder, you can use the
generate surface normals filter but that only works for
polydata.  The extract surface should get you from any other
data set to the polydata you want.

I have cell normals (vector) next I do
cell data to point data
extract surface
when I do calculator, the cell normal vector is not in the list.
How do I get the cell normal vector in the calculator list?
Thanks for your help,
Stephen


Andy

On Sun, Jun 19, 2011 at 4:01 AM, Stephen Wornom
mailto:stephen.wor...@inria.fr>
>> wrote:

   How does one compute the integral of P Normal ds ?
   where Normal is the surface normal vector

   click on integrate variables computes the integral of P ds
   I would like
   Fx = integral of P nx ds
   where nx ds is the surface area normal to the x-direction.
   Hope my question is clear.
   Stephen
   p.s.
   The surface in question is a cylinder

   ___
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-- 
stephen.wor...@inria.fr 

2004 route des lucioles - BP93
Sophia Antipolis
06902 CEDEX
   
Tel: 04 92 38 50 54

Fax: 04 97 15 53 51





--
stephen.wor...@inria.fr
2004 route des lucioles - BP93
Sophia Antipolis
06902 CEDEX

Tel: 04 92 38 50 54
Fax: 04 97 15 53 51

<>___
Powered by www.kitware.com

Visit other Kitware open-source projects at 
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