[Paraview] wallShearStress Calculation in Paraview

[Stephen Wornom]

Thanks, but did you forget to include the name of the forum? 
Stephen 

----- Original Message -----

> From: "Ezhilmathi Krishnasamy" <ezhkr601 at student.liu.se>
> To: "Ahmet Ahmet" <ahmetskyland at gmail.com>
> Cc: "ParaView" <paraview at paraview.org>
> Sent: Wednesday, December 6, 2017 3:05:56 PM
> Subject: Re: [Paraview] wallShearStress Calculation in Paraview

> Hi Ahmet,

> What you can do that is, use the filter name called extract surface.
> once you get that surface either you can export those values in form of from
> elements or from the points.

> It might work, or you may get more clear explanation from this forum.

> Cheers,
> Mathi

> On 6 December 2017 at 15:00, Ahmet Ahmet < ahmetskyland at gmail.com > wrote:

> > Hello everyone,
> 

> > I have results with OpenFOAM including p,T,U outputs. Due to some reasons,
> > I
> > can't use wallShearStress or wallgradU utility in OF. So, I have to
> > calculate it on Paraview. I saw many topics related to that on google, but
> > I
> > could not find a satisfactory answer. My case is 3-D, compressible and
> > laminar but we can think about incompressible and may be 2-D.
> 

> > I think the most important part for WSS is to calculate velocity gradient.
> > My
> > unsolved problem is to calculate that. How can I calculate gradients on the
> > wall? I have no-slip wall, that is u=0 and with Gradient of Unstructured
> > DataSet/Compute Derivatives filters, I obtained 0 on the wall. I think the
> > values in the nearest mesh to the wall should be accounted for. To do that,
> > what should I do?
> 

> > Note:
> 

> > 1. T he walls are not aligned with a coordinate axis. For this part, I
> > tried
> > to extract the wall surface and generate normal vectors.
> 
> > 2. As an alternative to get directly on wall, I tried to get slice a little
> > bit over the wall surface and then take surface vector on slice then
> > gradient of unstructured dataset on surface vector. That gives me a result
> > but I am not sure it's true.
> 

> > This may be simple for you, sorry for that.
> 
> > Thank you in advance,
> 
> > Ahmet
> 

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