# Transformation of a cartesian velocity gradient volTensorField to cylindrical coord.

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 June 24, 2009, 16:11 Transformation of a cartesian velocity gradient volTensorField to cylindrical coord. #1 New Member   Alex Join Date: Jun 2009 Location: Erlangen, Germany Posts: 7 Rep Power: 8 Hi Community, my name is Alex and I'm a PhD student at the University of Erlangen-Nuremberg. Well, my PhD thesis comprises some numerical simulations, namely the outflow of a non-newtonian fluid from a cylindroconical vessel. My "problem" now is the following. I need the shear rates that occur in this vessel. As this setup is axisymmetric, the best would be to get the shear rates in cylindrical coordinates. The flow in the cylindrical part (like in a tube) only has a axial velocity component, the angular and radial velocities are zero. Only in the conical part radial components occur. I am mostly interested in d(Uz)/dr, which is the shear rate of interest. Is it possible to transform the cartesian gradient of the velocity into it's corresponding cylindrical counterpart? Does a simple coordinate transformation the job? If yes, how do I do that? I am not a professional programmer, the only thing that helps me is my basic java knowledge. I searched the forum, and the only things I can find are not useful. I would really appreciate your help and I am looking forward to your answers!!! Best regards Alex

 April 25, 2012, 14:23 #3 New Member   Caroline Vandame Join Date: Aug 2010 Posts: 26 Rep Power: 6 I know this thread is quite old, but any chance you found how to get the velocity vector components in a cylindrical coordinate system from the cartesian coordinates?

 April 25, 2012, 18:03 #4 Senior Member   lore Join Date: Mar 2010 Location: Italy Posts: 463 Rep Power: 9 What about using the calculator in paraview to do the math?

 April 26, 2012, 18:20 #5 New Member   Caroline Vandame Join Date: Aug 2010 Posts: 26 Rep Power: 6 I'm running OpenFoam on a virtual machine so I'm trying to avoid Paraview. But thanks for the tip, I'll look into it

 April 26, 2012, 18:29 #6 Senior Member   lore Join Date: Mar 2010 Location: Italy Posts: 463 Rep Power: 9 I'm running it on a virtual machine as well. I created a shared folder so that once the case has run I can access the data using paraview from the host system. Just so that you know, sometimes, working on a shared folder, can led to some errors due to missing files (that are not missing at all). It0s just a matter of unmounting and remounting the shared folder.

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