[Paraview] wall shear stress

[Andy Bauer]

The following should work:

   - Gradient of Unstructured Data Set
   - Extract Surface
   - Generate Surface Normals
   - Calculator filter to compute the wall shear stress from the gradient
   and the surface normals.


On Fri, Oct 21, 2016 at 11:55 PM, Fande Kong <fdkong.jd at gmail.com> wrote:

> Still have hard time on this. If anyone in this mail list knows how to do
> this, I will appreciate for any suggestions. It would be great, if these is
> a step-by-step example.
>
> Regards,
>
> Fande,
>
> On Sun, Sep 18, 2016 at 6:54 PM, Fande Kong <fdkong.jd at gmail.com> wrote:
>
>> Hi David,
>>
>> Thanks very much for your reply. I am a new paraview user. Could you
>> possibly show me more details? Some documentations on each of these steps?
>>
>> On Sun, Sep 18, 2016 at 5:39 PM, David Thompson <
>> david.thompson at kitware.com> wrote:
>>
>>> Hi Fande,
>>>
>>> You should be able to use the gradient filter to compute the velocity
>>> gradient and examine the component of the gradient normal to the wall. That
>>> will be proportional to the shear stress at the wall. Is the wall aligned
>>> with a coordinate axis?
>>>
>>
>> No, the wall is not aligned with a coordinate axis.  In fact, the
>> geometry is very complex. It is a pulmonary artery tree with several
>> generations.
>>
>> Thanks,
>>
>> Fande,
>>
>>
>>> If not, you will need to extract the wall surface and generate normal
>>> vectors, then dot the gradient with the normal vectors.
>>>
>>>     David
>>>
>>> On Sep 18, 2016, at 16:01, Fande Kong <fdkong.jd at gmail.com> wrote:
>>>
>>> Hi Developers,
>>>
>>> I am solving an incompressible Navier-Stokes equations, and I have
>>> solutions for the velocity (u)  and the pressure (p). Is it possible to
>>> show the wall shear stress in paraview using the velocity?
>>>
>>>
>>> Fande Kong,
>>>
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>>
>
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> Please keep messages on-topic and check the ParaView Wiki at:
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>
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