# Radial and Tangential Velocity boundary conditions

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 August 17, 2010, 12:02 Radial and Tangential Velocity boundary conditions #1 Member   N. A. Join Date: May 2010 Posts: 64 Rep Power: 8 Hi Folks, I have four circular inlets in a cylindrical geometry that gives out inflow at an angle. I am trying to find if there is a way to speificy radial and tangential componets of the velocity and give it as a boundary conditions. I understand that the normal way of giving is in cartesion approach in (Ux,Uy,Uz) and I am wondering if tehre is a way to give in cylindrical coordinates, viz., (Ur,Ut,Uz) boundary conditions. Thanks, N.A.

 September 16, 2010, 10:48 #2 Senior Member   Join Date: Sep 2010 Location: France Posts: 224 Rep Power: 9 oh i have the same problem, and no body answered me a clear answer uptill now i hope that we will get a quick answer

 December 5, 2010, 14:22 Tangential & Axial Velocity Profile #3 New Member   Robyn Join Date: Jun 2010 Posts: 14 Rep Power: 8 Do either of you know how to convert from Ux,y,z to tangential and axial velocity's? I am working on a cyclone geometry and would like to convert my results.

 September 2, 2011, 06:38 Tangential velocity from cartesian components #4 New Member   Sujeet Kumar Shukla Join Date: Sep 2011 Posts: 1 Rep Power: 0 I would like to also know how to transform Cartesian velocity components of Fluent (i.e. Ux, Uy and Uz) into cylindrical components (i.e. axial, tangential and radial)

 September 2, 2011, 07:21 #5 Senior Member   Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 14 That can be achieved by an easy space-dependent matrix multiplication. You have to look it up in your favorite linear algebra book how it is done.

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