[Paraview] wall shear stress

[Fande Kong]

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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