Re: [vmtk-users] Wall shear stress computation with VMTK

[Simone M. <sim...@or...>]

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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Simone Manini, Eng
Orobix Srl
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On Jun 6, 2013, at 6:09 PM, "Emilie Sauvage" <emi...@uc...> 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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