This is outside of what I usually do, so I may not be much help. But once you have the vorticity at all verticies, that should include the verticies on the cylinder surface.
How do you extract the surface? Is it a body fitted grid or an embedded boundary/levelset to mark it? I would assume if you extract the surface in the pipeline downstream of the derivatives and interpolation filters, all of the variables would be available on the surface. Unless of course the surface is looking for cell data and not point data, in which case you would skip the second interpolation filter. Tim ----- Original Message ----- From: "Stephen Wornom" <stephen.wor...@inria.fr> To: agaglia...@ara.co.uk Cc: "ParaView list" <paraview@paraview.org>, "Andy Bauer" <andy.ba...@kitware.com>, gtg0...@mail.gatech.edu Sent: Thursday, June 2, 2011 3:18:29 PM Subject: Re: [Paraview] PV 3.10.1 computing vorticity from vector field ----- Original Message ----- From: "Adriano Gagliardi" <agaglia...@ara.co.uk> To: "Andy Bauer" <andy.ba...@kitware.com>, gtg0...@mail.gatech.edu, "stephen wornom" <stephen.wor...@inria.fr> Cc: "ParaView list" <paraview@paraview.org> Sent: Thursday, June 2, 2011 7:11:36 PM Subject: RE: [Paraview] PV 3.10.1 computing vorticity from vector field On this subject, it should also be possible to use the Python Calculator to perform this function. Create a vector, U and obtain the curl of it by using: curl(U). I think your version of Python must have numpy available, though. I tried both the suggestion of Time and Andy, both worked well. Now that I have the vorticity at all the vertices. What must I do to obtain the surface flow (vorticity) and surface vectors? The solution is for the Navier-Stokes equations for flow over a cylinder. I know how to extract the surface of the cylinder but how do I tell PV to use the vorticity and not the velocity field? Hope my quest is clear, Stephen <blockquote> =================================== Adriano Gagliardi MEng PhD Business Sector Leader Computational Aerodynamics Aircraft Research Association Ltd. Manton Lane Bedford Tel: 01234 32 4644 E-mail: agaglia...@ara.co.uk Url: www.ara.co.uk From: paraview-boun...@paraview.org [mailto:paraview-boun...@paraview.org] On Behalf Of Andy Bauer Sent: 02 June 2011 17:42 To: gtg0...@mail.gatech.edu; stephen.wor...@inria.fr Cc: ParaView list Subject: Re: [Paraview] PV 3.10.1 computing vorticity from vector field For computing vorticity, depending on the grid type you can also use the Gradient of Unstructured Datasets filter. There is an option to compute vorticity for 3 component arrays (i.e. velocity). It works on both point data and cell data and the output will be the same type of field data. I'm about to change this filter so that it will work with all types of VTK grids. Andy On Thu, Jun 2, 2011 at 12:29 PM, Tim Gallagher < tim.gallag...@gatech.edu > wrote: <blockquote> The output from the ComputeDerivatives is Cell Data. To do those things, you want to make it Point Data with another CellDataToPointData filter. The calculator would see it if you changed it from point data to cell data. But since you want to do other stuff with it, add the interpolation filter again and then it will appear with the rest of your point data. Tim ----- Original Message ----- From: "Stephen Wornom" < stephen.wor...@inria.fr > To: gtg0...@mail.gatech.edu Cc: "ParaView list" < paraview@paraview.org > Sent: Thursday, June 2, 2011 12:26:04 PM Subject: Re: [Paraview] PV 3.10.1 computing vorticity from vector field Tim Gallagher wrote: > 1. If it's cell centered data, apply the CellDataToPointData filter. If it's > point data, skip this step > 2. Apply the ComputeDerivatives filter. Choose your velocity vector as the > Vectors argument, set the Output Vector Type to Vorticity. I usually also set > Output Tensor Type to nothing unless you need it. > 3. Hit apply. > Works correctly but what must I do to: 1 make a vector or contour plot 2 tracer plot or vorticity lines (like streamlines) plot? The choice for these is only the velocity field that I read. Calculator does not see the vorticity vector that was created. Thanks for you help, Stephen > Tim > > ----- Original Message ----- > From: "Stephen Wornom" < stephen.wor...@inria.fr > > To: paraview@paraview.org > Sent: Wednesday, June 1, 2011 10:55:12 AM > Subject: [Paraview] PV 3.10.1 computing vorticity from vector field > > What are the steps to compute the vorticity vector from the velocity vector? > Stephen > > -- stephen.wor...@inria.fr 2004 route des lucioles - BP93 Sophia Antipolis 06902 CEDEX Tel: 04 92 38 50 54 Fax: 04 97 15 53 51 _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview _______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Follow this link to subscribe/unsubscribe: http://www.paraview.org/mailman/listinfo/paraview </blockquote> ********************************************************************** This email contains information that is private and confidential and is intended only for the addressee. 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