Dear Emily,
I think you can use vmtkmeshwallshearrate which computes wsr from a velocity
field.
It supports any kind of mesh files supported by vmtk.
You need to have the velocity array from components (u v w) so you can use
vmtkmeshvectorfromcomponents:
vmtkmeshvectorfromcomponents -ifile input_file -vector Velocity -components u v
w --pipe vmtkmeshwallshearrate -velocityarray Velocity -ofile output_file
Remember that the output file will be a surface file.
http://www.vmtk.org/VmtkScripts/vmtkmeshvectorfromcomponents
http://www.vmtk.org/VmtkScripts/vmtkmeshwallshearrate
I hope it helps,
Best Regards
Simone
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On Jun 6, 2013, at 6:09 PM, "Emilie Sauvage" <emilie.sauv...@uclouvain.be>
wrote:
> Dear Luca,
>
> I would like to ask you if there is a way of computing wall shear stress
> from nodal velocity and pressure values. In case this is possible, could
> you tell me what input file formats are supported?
> I'm asking this because the flow solver that I use does not output wall
> shear stress. I used ParaView to compute it, but my supervisor expressed
> some doubts about how accurate is vtk/ParaView when computing gradients
> of velocity from Finite Element data on unstructured grid. I posted a
> question on vtk mailing list, but did not get any reply. Then I thought
> that maybe VMTK can actually do this ...
>
> Thank you very much.
>
> Best regards,
>
> Emilie Sauvage
>
>
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