You probably need to write your own small python or c++ program to calculate it (I'd recommend python because it would be quicker). You'd generate n points along the path, put these into a vtkPolyData object and set this as the inport to a vtkProbeFilter (http://www.vtk.org/doc/nightly/html/classvtkProbeFilter.html), and set your mesh with the velocity vector as the filter source. You can extract the velocity vectors from this filter and dot them with the tangent vectors at your sample points. You could do this either using the basic VTK python interface or (the more modern approach) use the traited version with mayavi2.
Cheers Gerard Hans Fangohr wrote: > Dear all, dear Prabhu, > > the following question may be slighty off topic but I was hoping that > somebody in the audience may have tried to do something similar before > and could give some advice. If not, just ignore this email and accept > my apologies, please. > > We would like to calculate the circulation (=the line integral of > scalar product of velocity and tangent vector of the line) of the flow > around a torus-shaped object. We have the data in VTK (obviously using > mayavi to look at it ;-) ) and are wandering whether it might be > possible to compute the circulation with VTKs help. > > Some background information: > > The actual simulation is carried out with a somewhat complicated > locally refined rectangular mesh (and we have not implemented this > and are neither very confident in decoding the data structure) but > we have managed to import the data to VTK. It would therefore be > immensely convenient if VTK could compute the circulation as it > knows the velocity field anyway, and can carry out linear > interpolation between the provided data points (something which > would be that easy to code by hand for this example). > > It may be possible to use a square path around the torus shape object > (instead of circular path) if that makes the problem any easier to > handle. > > > Thank you for listening, > > Hans > > > > > -- > Hans Fangohr > > School of Engineering Sciences > University of Southampton > Phone: +44 (0) 238059 8345 > > Email: [EMAIL PROTECTED] > http://www.soton.ac.uk/~fangohr > > > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2008. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > MayaVi-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/mayavi-users ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ MayaVi-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mayavi-users
