Hello vmtk users, To piggyback on Emilie's query on computing velocity gradients, is there documentation for either vmtk or Paraview on how they compute gradients in general for unstructured meshes? For instance, do they use RBF-FD methods? I couldn't seem to find anything about the specifics.
Thanks, Evan Kao On 6/6/13, Simone Manini <simone.man...@orobix.com> wrote: > 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 > > -- > Simone Manini, Eng > Orobix Srl > via L.A. Muratori 3, 24123 Bergamo, Italy > > orobix: www.orobix.com > home: http://daron1337.github.com > twitter: twitter.com/daron1337 > mobile: +39.328.60.22.017 > office: +39.035.0296480 > +39.035.42131 > > "This message originates from Orobix Srl and its contents and attachments > are privileged and confidential and are intended only for the individual(s) > or entity(ies) named above. This message should not be forwarded, > distributed or disclosed. Any unauthorized use, dissemination and > duplication is strictly prohibited and may be unlawful. All personal > messages express views solely of the sender, which are not to be attributed > to Orobix Srl, and may not be copied or distributed without this disclaimer. > If you are not the intended recipient or received this message in error, > please delete this message and notify the sender by reply e-mail. Opinions, > conclusions and other information in this message that do not relate to the > official business of Orobix Srl shall be understood as neither given nor > endorsed by it." > > 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 >> >> >> ------------------------------------------------------------------------------ >> How ServiceNow helps IT people transform IT departments: >> 1. A cloud service to automate IT design, transition and operations >> 2. Dashboards that offer high-level views of enterprise services >> 3. A single system of record for all IT processes >> http://p.sf.net/sfu/servicenow-d2d-j >> _______________________________________________ >> vmtk-users mailing list >> vmtk-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/vmtk-users > > ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. A cloud service to automate IT design, transition and operations 2. Dashboards that offer high-level views of enterprise services 3. A single system of record for all IT processes http://p.sf.net/sfu/servicenow-d2d-j _______________________________________________ vmtk-users mailing list vmtk-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/vmtk-users
